Articles tagged with Stellar Evolution
Comprehensive exploration of living organisms, biological systems, and life processes across all scales from molecules to ecosystems. Encompasses cutting-edge research in biology, genetics, molecular biology, ecology, biochemistry, microbiology, botany, zoology, evolutionary biology, genomics, and biotechnology. Investigates cellular mechanisms, organism development, genetic inheritance, biodiversity conservation, metabolic processes, protein synthesis, DNA sequencing, CRISPR gene editing, stem cell research, and the fundamental principles governing all forms of life on Earth.
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Comprehensive investigation of human society, behavior, relationships, and social structures through systematic research and analysis. Encompasses psychology, sociology, anthropology, economics, political science, linguistics, education, demography, communications, and social research methodologies. Examines human cognition, social interactions, cultural phenomena, economic systems, political institutions, language and communication, educational processes, population dynamics, and the complex social, cultural, economic, and political forces shaping human societies, communities, and civilizations throughout history and across the contemporary world.
Fundamental study of the non-living natural world, matter, energy, and physical phenomena governing the universe. Encompasses physics, chemistry, earth sciences, atmospheric sciences, oceanography, materials science, and the investigation of physical laws, chemical reactions, geological processes, climate systems, and planetary dynamics. Explores everything from subatomic particles and quantum mechanics to planetary systems and cosmic phenomena, including energy transformations, molecular interactions, elemental properties, weather patterns, tectonic activity, and the fundamental forces and principles underlying the physical nature of reality.
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Study of the practice, culture, infrastructure, and social dimensions of science itself. Addresses how science is conducted, organized, communicated, and integrated into society. Encompasses research funding mechanisms, scientific publishing systems, peer review processes, academic ethics, science policy, research institutions, scientific collaboration networks, science education, career development, research programs, scientific methods, science communication, and the sociology of scientific discovery. Examines the human, institutional, and cultural aspects of scientific enterprise, knowledge production, and the translation of research into societal benefit.
Comprehensive study of the universe beyond Earth, encompassing celestial objects, cosmic phenomena, and space exploration. Includes astronomy, astrophysics, planetary science, cosmology, space physics, astrobiology, and space technology. Investigates stars, galaxies, planets, moons, asteroids, comets, black holes, nebulae, exoplanets, dark matter, dark energy, cosmic microwave background, stellar evolution, planetary formation, space weather, solar system dynamics, the search for extraterrestrial life, and humanity's efforts to explore, understand, and unlock the mysteries of the cosmos through observation, theory, and space missions.
Comprehensive examination of tools, techniques, methodologies, and approaches used across scientific disciplines to conduct research, collect data, and analyze results. Encompasses experimental procedures, analytical methods, measurement techniques, instrumentation, imaging technologies, spectroscopic methods, laboratory protocols, observational studies, statistical analysis, computational methods, data visualization, quality control, and methodological innovations. Addresses the practical techniques and theoretical frameworks enabling scientists to investigate phenomena, test hypotheses, gather evidence, ensure reproducibility, and generate reliable knowledge through systematic, rigorous investigation across all areas of scientific inquiry.
Study of abstract structures, patterns, quantities, relationships, and logical reasoning through pure and applied mathematical disciplines. Encompasses algebra, calculus, geometry, topology, number theory, analysis, discrete mathematics, mathematical logic, set theory, probability, statistics, and computational mathematics. Investigates mathematical structures, theorems, proofs, algorithms, functions, equations, and the rigorous logical frameworks underlying quantitative reasoning. Provides the foundational language and tools for all scientific fields, enabling precise description of natural phenomena, modeling of complex systems, and the development of technologies across physics, engineering, computer science, economics, and all quantitative sciences.
A team of researchers has analyzed 750 blue supergiant stars, offering insights into their evolutionary nature and physical properties. The study provides a comprehensive understanding of this critical phase in the lives of massive stars.
A study by Indiana University astronomer Songhu Wang reveals that at least a fraction of hot Jupiters cannot form through violent processes, suggesting a new understanding of their evolution. Researchers found 12% of hot Jupiters and 70% of warm Jupiters have nearby planetary companions.
Researchers at Ohio State University found that the shells of galactic bubbles are more complex than previously thought, with unexpected temperature and chemical properties. The study suggests that these bubbles were formed by intense star-formation activity rather than supermassive black hole activity.
A team of astronomers detected a massive superflare and prominence eruption on the star V1355 Orionis, which was capable of breaking free from the star's gravity and developing into Coronal Mass Ejections. The event released trillions of tons of material, making it one of the most massive ever observed.
Researchers discovered two massive touching stars that will eventually become black holes and collide, generating waves in space-time. The stars are currently feeding each other every three days before the smaller star collapses into a black hole in 700,000 years.
A UTSA-led research team has discovered a new exoplanet using indirect methods. The exoplanet, HIP 99770 b, is about 14 to 16 times the mass of Jupiter and orbits a nearly twice-as-massive star. This breakthrough opens a new avenue for scientists to discover and characterize exoplanets.
The HERA team has improved the sensitivity of a radio telescope, allowing them to detect radio waves from the cosmic dawn era. The data suggests that early galaxies contained few elements besides hydrogen and helium, unlike modern galaxies.
Scientists have created the first 2D map of wind patterns around a neutron star, revealing clues to galaxy formation. The map shows the wind's vertical structure and velocity, which is about 1 million miles per hour, and offers new insights into the influence of disk winds on galaxy evolution.
Astronomers have observed an extremely rare and aspherical Fast Blue Optical Transient (FBOT) explosion 180 million light years away. The explosion, similar to a flat disc shape, challenges scientists' current understanding of stellar explosions.
Researchers studying ancient quasars have discovered a rapid increase in warm carbon around 13 billion years ago, potentially linked to the 'Epoch of Reionisation' and large-scale heating of gas. This finding provides new insights into the evolution of the universe's chemical composition.
Researchers have discovered a supernova that exhibits unusual rebrightening at millimeter wavelengths, offering insights into the evolution of massive stars. The study suggests that interaction with an intermediate-distance binary companion created a hollow shell of circumstellar medium, leading to the observed rebrightening.
Researchers studied a Type 1a supernova in a faraway spiral galaxy, NGC 1566, to understand how certain chemical elements are emitted into the surrounding cosmos. The study confirms that ejecta doesn't escape the confines of the explosion, validating many assumptions about how complex entities work.
The James Webb Space Telescope has enabled the detection of compact structures of star clusters inside galaxies, known as clumps. Researchers have studied the link between clump formation and galaxy growth in distant galaxies, providing new insights into the early stages of galaxy formation.
The Hydrogen Epoch of Reionization Array (HERA) team has doubled the sensitivity of its radio telescope array, providing clues to the composition of stars and galaxies in the early universe. The data suggest that early galaxies contained few elements besides hydrogen and helium.
Researchers found that the stellar initial mass function varies with metallicity and age of stars, affecting galaxy formation and chemical enrichment estimates. The study used LAMOST telescope data to count red dwarf stars and measure their metallicity, revealing a variable abundance of low-mass stars in the Milky Way.
Researchers detect radio signal from record-breaking distance galaxy, measuring gas composition and gaining insights into the early universe. The signal was amplified by a factor of 30 using gravitational lensing, allowing scientists to study a previously inaccessible region.
The Butterfly Nebula's unique shape is caused by a second star orbiting the central star, creating wing-like lobes. New research reveals powerful winds are altering the material within these lobes, contradicting existing models of planetary nebulae formation and evolution.
Researchers used the Panchromatic Hubble Andromeda Treasury Triangulum Extended Region — or PHATTER — survey to study the Triangulum galaxy. The team discovered two drastically different structures depending on the age of the stars, with younger and older stars having distinct distributions.
The ERC Red Cardinal project aims to shed light on the mysterious phase of star formation extinction in massive galaxies. The team, led by Sirio Belli, will use James Webb Space Telescope observations to test a hypothesis predicting two distinct modes of stellar extinction.
Researchers have observed an exoplanet whose orbit is decaying around an aging star, providing the first look at a solar system this late in its life cycle. The doomed world, Kepler-1658b, has less than 3 million years left before colliding with its expanding star.
Researchers found that 24% of surveyed red giants experienced structural discontinuities, affecting their oscillations and star's internal composition. The study aims to refine stellar models and uncover the history of the universe through detailed stellar fossil records.
Researchers at the University of Rochester used x-ray spectroscopy to study radiation transport in dense plasmas. They found that atomic energy level changes do not follow conventional quantum mechanics theories, instead conforming to a self-consistent approach based on density-functional theory.
A new model accounts for the interplay of forces acting on newborn planets, explaining two puzzling observations: the radius valley and peas in a pod. The research suggests that giant impacts, like the one that formed our moon, are probably a generic outcome of planet formation.
Researchers at Liverpool John Moores University and the University of Montpellier have developed an early warning system for massive star supernovae. These stars will suddenly dim by a factor of 100 in visible light as they accumulate material around them, forming a 'cocoon' that obscures their light.
Researchers using JWST's First Deep Field image identified the most distant globular clusters, potentially relics of the first and oldest stars. These discoveries provide a detailed look at the earliest phase of star formation, confirming JWST's power in uncovering the universe's origins.
Astronomers detect massive light burst from 'infant' Universe, revealing properties of cosmic explosions. The GRB was triggered by a space explosion that occurred when the Universe was less than 900 million years old.
Researchers used STARFORGE simulations to uncover what determines star masses, finding that stars regulate their own formation. This discovery may enable better understanding of star formation within our galaxy and other galaxies.
Astronomers have discovered a unique triple star system consisting of two binary stars and one massive tertiary star. The system is incredibly luminous due to its compact nature and was initially detected by amateur astronomers using NASA's TESS observatory data.
Astronomers have found that denser and more turbulent environments tend to form binary/multiple stellar systems. The study used the James Clerk Maxwell Telescope and Atacama Large Millimeter/submillimeter Array to analyze the Orion Cloud complex, revealing that about 13 dense cores are giving birth to binary/multiple stars.
Asteroseismology helps determine mass, age, and features of stars in globular clusters, such as M4. A sample of 37 stars was analyzed, with most being red giants and others horizontal branch stars. The study provides an asteroseismic characterization of the stellar populations, shedding light on their origins and chemical characteristics.
An international team developed a new theoretical model that solves part of the 'solar problem' by considering the Sun's rotation and magnetic fields. The results reproduce the concentration of helium and lithium in the Sun's outer layers, providing insights into stellar physics.
Astronomers at the University of Sydney have discovered slimmer red giant stars, which have undergone dramatic weight loss. The unusual stars are thought to have lost mass due to their stellar neighbors, providing valuable insights into star evolution and life in the Milky Way.
Researchers using ALMA and Hubble Space Telescope observe V Hydrae, a carbon-rich star, expelling matter in six slowly-expanding rings and two hourglass-shaped structures. The discovery confirms the traditional model of AGB star death is incomplete or incorrect.
Researchers have discovered a strange new type of star with surfaces composed of carbon and oxygen, the by-product of helium burning. The stars' unusual composition suggests they may have formed through rare stellar mergers, but current models cannot fully explain their origins.
The ARC Centre of Excellence for All Sky Astrophysics in 3D has discovered that the youngest generation of stars will eventually stop contributing metals back to the universe. This change affects the composition of the galaxy over time, with around half of the carbon and all elements heavier than iron synthesized by stars like our Sun.
A new study analyzes presolar grains in meteorites to determine their stellar origins, using improved spatial resolution and isotopic analysis techniques. The research finds that the N isotope ratios of certain grains link them to different types of carbon stars, providing insights into the history of the universe.
The Hubble Space Telescope has discovered white dwarfs that burn hydrogen on their surface, slowing down their cooling rate. This finding challenges the conventional view of white dwarfs as inert, slowly cooling stars.
A new study using the Very Long Baseline Array (VLBA) has refined the distance to Cygnus X-1 and found its black hole mass to be approximately 21 solar masses, exceeding current stellar evolution models. This massive black hole suggests that lower mass loss through stellar winds during progenitor star evolution may have occurred.
Researchers observed stellar winds around cool red giant stars using ALMA Observatory, finding disk-shaped, spiral, and cone-like structures. The team concludes that companions or exoplanets influence the shape of stellar winds and planetary nebulae.
Researchers tracked the evolution of stellar eggs in Taurus, discovering internal structures and bipolar gas streams that indicate a star's birth. The team used ALMA's compact array to observe starless cores and found evidence for 'first hydrostatic cores,' short-lived objects formed before a baby star's birth.
A study published in Nature Communications has discovered phosphorus-rich stars with unusual abundances, defying current theories of stellar evolution and nucleosynthesis. The findings suggest a new type of object that could provide insights into the origin of life's essential element.
A three-year study of Westerlund 2, a massive young star cluster, reveals that the material surrounding stars near the centre is mysteriously devoid of dense clouds of dust. This is caused by the brightest stars eroding and dispersing the discs of gas and dust of neighbouring stars.
Astronomers found that stars in the cluster's periphery have planet-forming dust clouds, while those near the center lack them. The observations suggest that location plays a crucial role in planet formation, and massive stars may alter disk properties, making it harder for planets to form.
Researchers analyzed data from 224 stars to understand the interplay between rotation and convection in determining a star's activity level. The study found that turbulent convection plays a crucial role in explaining the behavior of main-sequence and evolved stars, contradicting previous models.
A team of researchers has discovered a massive star that formed a planetary nebula, pushing the limits of theoretical predictions. The star, PNe BMP1613-5406, is one of the most massive stars ever found to have formed a PN, providing valuable insights into stellar evolution and chemical composition.
Researchers found that circumstellar matter surrounding red supergiant stars can hide shock breakout light, causing supernovae to brighten faster than expected. The discovery changes our understanding of stellar evolution and offers insights into the origin of diversity in supernovae.
Allan Sandage's last paper reveals that physicist George Gamow and astronomer Walter Adams had previously discovered subgiants in the 1940s, which would have accelerated the development of stellar evolutionary theory. The study shows that these early findings were largely ignored due to biases in the time.
Researchers have developed a new framework to understand the evolution of sun-like stars, which can help determine their age with more precision. The model predicts that younger stars will vary significantly in x-ray emission intensity, but convergence occurs after a certain age, making them more predictable.
Researchers have developed a new method to probe the internal magnetic fields of red giant stars using asteroseismology. This technique involves analyzing variations in light emitted from a star as due to sound waves from its interior, revealing strong internal magnetic fields in these stars.
Researchers found blue stragglers with different properties, indicating both collision-induced and vampirism-based formation. These findings provide direct evidence of star cluster dynamics on stellar evolution.
Lowell Observatory Director Eileen Friel has been selected as an AAAS Fellow for her contributions to the astronomical community. She is recognized for her diligence in mentoring young scientists through the Research Experiences for Undergraduates program.
This issue features studies on variability in NGC2301 II, superhumps in cataclysmic binaries, and host galaxies of QSOs at high redshift. Researchers also investigate data exchange standards for optical interferometry and analyze seeing data for the Advanced Technology Solar Telescope.
Researchers have developed a new model to predict the physics of stellar burning, particularly in stars like V4334 Sgr that undergo brief rebirths. The model predicts that V4334 Sgr will become much hotter and then slowly repeat the stellar rebirth cycle, returning to its current temperature in roughly two hundred years.
Astrophysicist James Annis suggests that cataclysmic gamma-ray bursts could be sterilizing galaxies, preventing extraterrestrial life from reaching Earth. This theory may provide an explanation for the Fermi Paradox, with intelligent life having recently emerged in the Galaxy and being unable to explore yet.
A team of astronomers led by Bo Reipurth and John Bally observed that ultraviolet radiation from nearby massive stars destroyed the cocoons of gas and dust surrounding young stars, revealing billions of miles long supersonic jets. The destruction has provided new insight into star birth and evolution, and may have implications for the ...