Results 201 to 210 of about 562,019 (240)
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Scientific American, 2007
This article reports that astronomers have found an exoplanet that likely survived the red giant phase of its parent star. Named V391 Pegasi, it belongs to a class of subdwarf stars that flicker. Researchers noticed the regularity of the flickering and says it is a planet at least 3 times bigger than Jupiter.
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This article reports that astronomers have found an exoplanet that likely survived the red giant phase of its parent star. Named V391 Pegasi, it belongs to a class of subdwarf stars that flicker. Researchers noticed the regularity of the flickering and says it is a planet at least 3 times bigger than Jupiter.
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EAS Publications Series, 2015
A new rotation model for post-main sequence stars is proposed. This model quantitatively reproduces core and surface rotation rates of subgiant stars, as well as the core rotation of helium-burning clump stars.
Y. Kissin, C. Thompson
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A new rotation model for post-main sequence stars is proposed. This model quantitatively reproduces core and surface rotation rates of subgiant stars, as well as the core rotation of helium-burning clump stars.
Y. Kissin, C. Thompson
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Axion bremsstrahlung in red giants
Physical Review D, 1990We calculate the bremsstrahlung emission rate of axions from a degenerate but weakly coupled plasma, using a Debye structure factor to take account of the nuclei correlations. This result pertains to axion emission from red giants near the helium flash and thus could be used to make a previous bound precise which involves the suppression of helium ...
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1994
Increasing evidence suggests that the mechanism(s) for heating the chromospheres of the coolest red giants may be quite different from those responsible for heating in solar-type stars, but little progress toward a quantitative test of this important idea has been made, both because of the scarcity of suitable observations and the difficulty of ...
Hollis R. Johnson +2 more
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Increasing evidence suggests that the mechanism(s) for heating the chromospheres of the coolest red giants may be quite different from those responsible for heating in solar-type stars, but little progress toward a quantitative test of this important idea has been made, both because of the scarcity of suitable observations and the difficulty of ...
Hollis R. Johnson +2 more
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1981
Basic concepts in the theory of astronomical masers which are necessary for the discussion of red giant masers are introduced. Maser radiation from late type stars is then discussed in detail with special emphasis on SiO masers as probes of the stellar atmosphere and OH masers as a tool for studying the mass loss process and the circumstellar shell.
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Basic concepts in the theory of astronomical masers which are necessary for the discussion of red giant masers are introduced. Maser radiation from late type stars is then discussed in detail with special emphasis on SiO masers as probes of the stellar atmosphere and OH masers as a tool for studying the mass loss process and the circumstellar shell.
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1981
Expanding, cool envelopes around red giants were detected many years ago when Adams and McCormack (1935) discovered that on high dispersion spectra of ∝ Ori, ∝1 Her, o Cet and e Peg the stronger resonance lines showed violet displaced absorption cores which could be explained by an expanding gaseous envelope.
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Expanding, cool envelopes around red giants were detected many years ago when Adams and McCormack (1935) discovered that on high dispersion spectra of ∝ Ori, ∝1 Her, o Cet and e Peg the stronger resonance lines showed violet displaced absorption cores which could be explained by an expanding gaseous envelope.
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Fred Hoyle, Red Giants and Beyond
Astrophysics and Space Science, 2003The impact of Fred Hoyle’s work on the structure and evolution of red giants, particularly his breakthrough contribution with Martin Schwarzschild (1955), is described and assessed. Working with his students in the early 1960s, Hoyle presented new physical ways of understanding some of the approximations used, and results obtained, in that seminal ...
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Giant virus biology and diversity in the era of genome-resolved metagenomics
Nature Reviews Microbiology, 2022Frederik Schulz +2 more
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Structural Chemistry of Giant Metal Based Supramolecules
Chemical Reviews, 2021Alexander V Virovets +2 more
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