FUSE Observations of Long-Period Pulsators Among Hot Subdwarf B Stars

Details FUSE Observations of Long-Period Pulsators Among Hot Subdwarf B Stars FUSE Observations of Long-Period Pulsators Among Hot Subdwarf B Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6006c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #60.06; Bulletin of the American Astronomical Society, Vol. 39, p.844

Astronomy and Astrophysics

Astronomy

Scientific paper

Long-period pulsating V1093 Her stars are hot subdwarf B stars (sdB) that exhibit very low-amplitude and long-period (2000 - 9000 s) luminosity variations. With effective temperature ranging from 23,000 K to 29,000 K, V1093 Her stars are cooler than the short-period V361 Hya pulsators. The pulsations observed in both groups are believed to be excited by the same kappa-mechanism, for which the increase in opacity is the result of an enhancement of the iron-peak elements abundance in the envelopes of sdB stars. Such an enhancement appears naturally from the diffusive equilibrium between gravitational settling and radiative levitation. Although the pulsations are driven in regions underneath the atmosphere, we want to find out whether the long-period variables and constant stars might be distinguishable on the basis of photospheric abundances. In this study, we present an abundance analysis of five V1093 Her stars based on Far Ultraviolet Spectroscopic Explorer (FUSE) observations, and show that the abundance of the iron-peak elements observed in the V1093 Her stars does not differ significantly from that observed in constant stars.
P.C. is a Canadian representative to the FUSE project supported by CSA under a PWGSC contract while G.F. acknowledges the contribution of the Canada Research Chair Program. This work was supported in part by NASA grant NNG06GA42G, by the NSERC of Canada, and by the Fund FQRNT (Quebec).

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