Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...678.1329b&link_type=abstract
The Astrophysical Journal, Volume 678, Issue 2, pp. 1329-1341.
Astronomy and Astrophysics
Astronomy
22
Diffusion, Stars: Abundances, Stars: Individual (Pg 0101+039), Stars: Individual (Pg 1338+481), Stars: Individual (Pg 1627+017), Stars: Individual: Alphanumeric: Pg 1716+426, Stars: Individual (Phl 457), Stars: Oscillations, Stars: Subdwarfs, Techniques: Spectroscopic
Scientific paper
We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of five V1093 Her (PG 1716+426) stars, the subgroup of hydrogen-rich subdwarf B stars that exhibit very low amplitude, long-period luminosity variations. Our primary aim is to investigate whether these stars display abundances which differ from those observed in the nonvariable sdB stars and also in the shorter period V361 Hya variables. For the light elements and for those beyond the iron peak, our abundances are consistent with the trends observed in earlier studies. For the important iron peak elements Ti, V, Cr, Mn, Fe, Co, and Ni, which are thought to be directly linked to the driving mechanism in both long-period and short-period variables, the abundances determined in the V1093 Her stars appear very homogeneous and exhibit mild enrichments (by factors of 2-5 for Cr, Mn, Fe, and Co) over the solar value. However, these abundances do not differ appreciably from those measured in a sample consisting of constant stars and one short-period pulsator. The implications of these findings for current models which involve both diffusion processes and stellar winds to account for the driving of nonradial pulsations in sdB stars are discussed.
Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by Johns Hopkins University under NASA contract NAS5-32985. Observations were also obtained at the MMT Observatory, a joint facility of the University of Arizona and the Smithsonian Institution.
Blanchette Jean-Philippe
Chayer Pierre
Dupuis Jean
Fontaine Gérard
Fontaine M.
No associations
LandOfFree
FUSE Determination of Abundances in Long-Period Pulsating V1093 Her (PG 1716+426) 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 FUSE Determination of Abundances in Long-Period Pulsating V1093 Her (PG 1716+426) Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FUSE Determination of Abundances in Long-Period Pulsating V1093 Her (PG 1716+426) Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1406653