Results 61 to 70 of about 91 (85)
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Pulsations in subdwarf B stars
Journal of Astrophysics and Astronomy, 2005Subdwarf B stars play a significant role in close binary evolution and in the hot star content of old stellar populations, in particular in giant elliptical galaxies. While the question of their origin poses several problems for stellar evolution theory, one of their most fascinating properties is the presence of multi-periodic 2–3 minute oscillations.
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Progress on the Front of Pulsating Subdwarf B Stars
Astrophysics and Space Science, 2004We briefly review the recent advances that have been made on the front of pulsating subdwarf B (sdB) stars. The first family of sdB pulsators, the EC 14026 stars, was discovered a few years ago and consists of short-period (∼100−200 s) p-mode variables.
Gilles Fontaine +7 more
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A Theoretical Exploration of the Pulsational Stability of Subdwarf B Stars
Publications of the Astronomical Society of the Pacific, 2001In this paper, we first review the main steps of a purely theoretical exploration of the pulsation properties of subdwarf B (sdB) stars that led us, ultimately, to postulate the existence of a new class of pulsating stars. Using both detailed evolutionary and static models of sdB stars, we were able to establish that a potent oscillation driving ...
Stéphane Charpinet +2 more
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TESS observations of pulsating subdwarf B stars
2020Transiting Exoplanet Survey Satellite (TESS) observations show CD-28 degrees 1974 to be a gravity(g)-mode-dominated hybrid pulsating subdwarf B (sdBV) star. It shows 13 secure periods that form an l = 1 asymptotic sequence near the typical period spacing.
Reed, Michael D. +9 more
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Subdwarf B stars in HW Vir systems
EAS Publications Series, 2003Subdwarf B stars (sdB) dominate the populations of faint blue stars and are found in both the old disk (field sdBs) and halo populations (globular cluster members) of our own Galaxy. The origin of sdB stars remains largely a puzzle, but evidence is accumulating that close binary evolution is fundamental to the problem.
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The Structure of Subdwarf B Stars as Revealed by Asteroseismology
2006The rapid p-mode oscillations observed in EC 14026 stars offer interesting opportunities to constrain, with the tools of asteroseismology, the main parameters that define their internal structure. We present the structural properties of sdB stars that are emerging from our detailed asteroseismic studies.
Charpinet, S. +4 more
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Subdwarf B and O Stars: Which Evolutionary Pathways?
2009Hot subdwarf stars (spectral types subdwarf B and O) are long lived stars producing a large amount of UV radiation. This makes them excellent candidates to explain the UV radiation observed in old populations. However, the origin of both classes of hot subdwarfs is unclear. I review possible single star and binary channels. High resolution observations
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Diffusion Calculations in the Atmospheres of Subdwarf B Stars
2008¨rpceedo,g pthe the conference on "Hot Subdwarf Stars and Related Objects", held 23-27 July, 2007, Otto-Friedrich-Universität, Bamberg (Germany). Edited by Ulrich Heber, C. Simon Jeffery and Ralf Napiwotzki.
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Progress in Sounding the Interior of Pulsating Hot Subdwarf Stars
AIP Conference Proceedings, 2009Pierre Chayer +2 more
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