Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..221w&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 221-231. Research supported by the Natural Sciences and Engineering R
Astronomy and Astrophysics
Astrophysics
38
Hot Stars, Stellar Atmospheres, Stellar Evolution, Stellar Models, Subdwarf Stars, Early Stars, High Gravity Environments, White Dwarf Stars
Scientific paper
Model atmospheres for hot, high-gravity stars are utilized to study the evolutionary path of hot subdwarfs into white dwarfs. A new approach is used in which theoretical evolutionary tracks are transformed into the appropriate observer's diagram, where a direct comparison with unprocessed observations can be performed. The sdB/sdO transition is considered to result from a change in the surface chemical composition of hot subdwarfs due to convective mixing of hydrogen and helium below the surface and/or diffusion of hydrogen through helium. A possible mechanism for the expulsion of hydrogen from the sdO star, producing a helium-rich white dwarf, is discussed. On the basis of diffusion arguments, an upper limit on the lifetime of the sdB phase is set and an sdB birthrate number is implied. Post-ZAHB stars are seen as likely progenitors of hot subdwarfs.
Cabot William
Fontaine Gérard
Van Horn Hugh M.
Wesemael François
Winget Don E.
No associations
LandOfFree
The hot subdwarfs revisited does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The hot subdwarfs revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The hot subdwarfs revisited will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1015291