Hot Subdwarfs from the Stable Roche Lobe Overflow Channel
arXiv:0906.2316 · doi:10.1051/0004-6361/200809454
Abstract
In this study, we concentrate on the formation and evolution of hot subdwarfs binaries through the stable Roche lobe overflow (RLOF) channel of intermediate-mass binaries. We aim at setting out the properties of hot subdwarfs and their progenitors, so that we can understand the formation and evolution of hot subdwarfs comprehensively. We have obtained the ranges of the initial parameters of progenitor binaries and the properties of hot subdwarfs through the stable RLOF channel of intermediate-mass binaries, e.g. mass, envelope mass and age of hot subdwarfs. We have found that hot subdwarfs could be formed through the stable Roche lobe overflow at main sequence and Hertzsprung gap. We have also found that some subdwarf B or OB stars have anomalous high mass (around 1 solar mass) with thick envelope (0.07 solar mass to 0.16 solar mass) in our models. By comparing our theoretical results with observations on the hot subdwarfs in open clusters, we suppose a quantity of hot subdwarfs in binary systems might be found in open clusters in the future.
13 pages, 15 figures, published in Astronomy and Astrophysics
References in corpus (24)
- The Origin of Subdwarf B Star (I): the Formation Channels
- The origin of sdB stars (II)
- Approximate input physics for stellar modelling
- Evolutionary Binary Sequences for Low- and Intermediate-Mass X-ray Binaries
- Ultraviolet Radiation from Evolved Stellar Populations -- I. Models
- The binary fraction of extreme horizontal branch stars
- The Origin of Extreme Horizontal Branch Stars
- A Complete Survey of Case A Binary Evolution with Comparison to Observed Algol-Type Systems
- Efficiency of mass transfer in massive close binaries, Tests from double-lined eclipsing binaries in the SMC
- The Initial Mass Function of the Galactic Bulge Down to ~0.15 Msun
- Close binary EHB stars from SPY
- Low and intermediate-mass close binary evolution and the initial - final mass relation
- Orbital periods of twenty two subdwarf B stars
- Which Massive stars are Gamma-Ray Burst Progenitors?
- Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
- Hot subdwarfs from the ESO Supernova Ia Progenitor Survey - I. Atmospheric parameters and cool companions of sdB stars
- Spectral analysis of sdB stars from the Hamburg Quasar Survey
- On the Origin of the UV Upturn in Elliptical Galaxies. I. Sensitivity of UV Population Synthesis to Various Input Parameters
- The lack of close binaries among hot horizontal branch stars in NGC6752
- High resolution spectroscopy of bright subdwarf B stars - I. Radial velocity variables
- UV Upturn in Elliptical Galaxies: Theory
- Discovery of a luminous white dwarf in a young star cluster in the Large Magellanic Cloud
- Optical spectroscopy of the candidate luminous white dwarf in the young LMC cluster NGC1818
- On the Nature of the Peculiar Hot Star in the Young LMC Cluster NGC1818