Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-06-11
Astronomy and Astrophysics
Astrophysics
9 pages, AAS LaTeX v4.0 + one postscript figure. Best with times.sty. Submitted to Astrophysical Journal Letters. Postscript f
Scientific paper
10.1086/310335
We present key sample results of a systematic survey of the pulsation properties of models of hot B subdwarfs. We use equilibrium structures taken from detailed evolutionary sequences of solar metallicity (Z = 0.02) supplemented by grids of static envelope models of various metallicities (Z = 0.02, 0.04, 0.06, 0.08, and 0.10). We consider all pulsation modes with l = 0, 1, 2, and 3 in the 80--1500 s period window, the interval currently most suitable for fast photometric detection techniques. We establish that significant driving is often present in hot B subdwarfs and is due to an opacity bump associated with heavy element ionization. We find that models with Z >= 0.04 show low radial order unstable modes; both radial and nonradial (p, f, and g) pulsations are excited. The unstable models have Teff > 30,000 K, and log g > 5.7, depending somewhat on the metallicity. We emphasize that metal enrichment needs only occur locally in the driving region. On this basis, combined with the accepted view that local enrichments and depletions of metals are common place in the envelopes of hot B subdwarfs, we predict that some of these stars should show luminosity variations resulting from pulsational instabilities.
Brassard Pierre
Charpinet Stephane
Dorman Ben
Fontaine Gilles
No associations
LandOfFree
The Potential of Asteroseismology for Hot, Subdwarf B Stars: A New Class of Pulsating Stars? 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 Potential of Asteroseismology for Hot, Subdwarf B Stars: A New Class of Pulsating Stars?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Potential of Asteroseismology for Hot, Subdwarf B Stars: A New Class of Pulsating Stars? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-100765