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Star on a Hubble diet
December 12, 2006How heavy can a star be? This conundrum has haunted astronomers for decades. Theory indicates that there should be an upper stellar mass limit somewhere between 120 and 300 solar masses. Even though heavy stars are very bright, measurements of their masses can be complicated. The majority of the heaviest stars - some researchers say as many as 90% or maybe even more - tend to be born in multiple systems that can easily disguise themselves as single very heavy stars. Moreover, these stellar heavyweights are so rare that only a few are close enough to the Sun to be examined in detail.
One of the top candidates for the title of "Milky Way stellar heavyweight champion" was, until now, Pismis 24-1, a bright young star that lies in the core of the small open star cluster Pismis 24 (the bright stars in the Hubble image) about 8,000 light-years away from Earth. Pismis 24-1 was thought to have an incredibly large mass of 200 to 300 solar masses. This would have made it by far the most massive known star in the Milky Way. New NASA/ESA Hubble measurements of the star, have, however, resolved Pismis 24-1 into two separate stars, and, in doing so, have "halved\\\
ESA/Hubble Information Centre
Solar Masses Current Events and Solar Masses News RSSSwift XMM-Newton Satellites Tune Into a Middleweight Black Hole
While astronomers have studied lightweight and heavyweight black holes for decades, the evidence for black holes with intermediate masses has been much harder to come by.
XMM-Newton uncovers a celestial Rosetta stone
ESA's XMM-Newton orbiting X-ray telescope has uncovered a celestial Rosetta stone: the first close-up of a white dwarf star, circling a companion star, that could explode into a particular kind of supernova in a few million years.
Birth of a star predicted
The astrophysicist João Alves, director of the Calar Alto Observatory in Almeria, and his colleague Andreas Bürkert, from the German observatory in the University of Munich, believe that "the inevitable future of the starless cloud Barnard 68" is to collapse and give rise to a new star, according to an article which has been published recently in The Astrophysical Journal.
XMM-Newton takes astronomers to a black hole's edge
Using new data from ESA's XMM-Newton spaceborne observatory, astronomers have probed closer than ever to a supermassive black hole lying deep at the core of a distant active galaxy.
New understanding of the origin of galaxies advanced
A new theory as to how galaxies were formed in the Universe billions of years ago has been formulated by Hebrew University of Jerusalem cosmologists. The theory takes issue with the prevailing view on how the galaxies came to exist.
1843 stellar eruption may be new type of star explosion
Eta Carinae, the galaxy's biggest, brightest and perhaps most studied star after the sun, has been keeping a secret: Its giant outbursts appear to be driven by an entirely new type of stellar explosion that is fainter than a typical supernova and does not destroy the star.
The quiet explosion
A European-led team of astronomers are providing hints that a recent supernova may not be as normal as initially thought. Instead, the star that exploded is now understood to have collapsed into a black hole, producing a weak jet, typical of much more violent events, the so-called gamma-ray bursts.
Galaxies gone wild!
Interacting galaxies are found throughout the Universe, sometimes as dramatic collisions that trigger bursts of star formation, on other occasions as stealthy mergers that result in new galaxies.
NASA scientists identify smallest known black hole
Using a new technique, two NASA scientists have identified the lightest known black hole. With a mass only about 3.8 times greater than our Sun and a diameter of only 15 miles, the black hole lies very close to the minimum size predicted for black holes that originate from dying stars.
Black hole found in enigmatic Omega Centauri
A new discovery has resolved some of the mystery surrounding Omega Centauri, the largest and brightest globular cluster in the sky. Images obtained with the Advanced Camera for Surveys onboard the NASA/ESA Hubble Space Telescope and data obtained by the GMOS spectrograph on the Gemini South telescope in Chile show that Omega Centauri appears to harbour an elusive intermediate-mass black hole in its centre.
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Effect of water depths on heat and mass transfer in a passive solar still: in summer climatic condition [An article from: Desalination] by A.Kr. Tiwari (Author), G.N. Tiwari (Author) This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser. Description: In this communication, an attempt has been made to find out the effect of water depth on evaporative mass transfer coefficient for a passive single-slope distillation system in summer climatic condition. The experiments have been conducted on a south facing, single slope, solar still of 30^o inclination of condensing cover, in summer climatic condition for 24 h on different five days for different five water depths from 0.04 m to 0.18 m. The objective of the present paper is to study the behavioral variation in internal... |
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Bell Fitness Solar Belt (One Size Fits Most) by Bell Bell Fitness Solar Belt helps reduce water weight and keeps muscles warm. Constructed using 1/4" thick neoprene for long wear and durability. Adjustable closure provides custom fit. |
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Battery and solar-operated BMI calculator for quick, easy determination of the individual Body Mass by SECA Battery and solar-operated BMI calculator for quick, easy determination of the individual Body Mass index (BMI) The BMI calculator is a simple and quick wayto calculate Body Mass Index. Patient data can be entered in feet, inches, centimeters, pounds, kilograms, in any combination. Switchable to metric format, and also functionsas a standard calculator.Solar-powered, no batteries needed. Dimensions(WxHx) 3 3/4 x 2 1/4" Weight 0.8 lb Product photo may not exactly match the product offered for sale. Please refer to the product description. |
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Modelling of thermal characteristics of insulated mass in zero-heating passive solar houses: Part 2--simulation results.: An article from: Architectural Science Review by Kumar Mithraratne (Author), Brenda Vale (Author) This digital document is an article from Architectural Science Review, published by Thomson Gale on September 1, 2006. The length of the article is 4616 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. Citation Details Title: Modelling of thermal characteristics of insulated mass in zero-heating passive solar houses: Part 2--simulation results. Author: Kumar Mithraratne Publication: Architectural Science Review (Magazine/Journal) Date: September 1, 2006 Publisher: Thomson Gale Volume: 49 Issue: 3 Page: 221(8) Distributed by Thomson... |
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