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MULTIWAVELENGTH OBSERVATIONS OF THE HOT DB STAR PG 0112+104
| Content Provider | Scilit |
|---|---|
| Author | Dufour, P. Desharnais, S. Wesemael, F. Chayer, P. Lanz, T. Bergeron, P. Fontaine, G. Beauchamp, A. Saffer, R. A. Kruk, J. W. Limoges, M. -M. |
| Copyright Year | 2010 |
| Description | Journal: The Astrophysical Journal We present a comprehensive multiwavelength analysis of the hot DB white dwarf PG 0112+104. Our analysis relies on newly acquired FUSE observations, on medium-resolution FOS and GHRS data, on archival high-resolution GHRS observations, on optical spectrophotometry both in the blue and around Hα, as well as on time-resolved photometry. From the optical data, we derive a self-consistent effective temperature of 31,300 ± 500 K, a surface gravity of log g = 7.8 ± 0.1 (M = 0.52 M$ _{☉}$), and a hydrogen abundance of log N(H)/N(He)< –4.0. The FUSE spectra reveal the presence of C II and C III lines that complement the previous detection of C II transitions with the GHRS. The improved carbon abundance in this hot object is log N(C)/N(He) = –6.15 ± 0.23. No photospheric features associated with other heavy elements are detected. We reconsider the role of PG 0112+104 in the definition of the blue edge of the V777 Her instability strip in light of our high-speed photometry and contrast our results with those of previous observations carried out at the McDonald Observatory. |
| Related Links | http://iopscience.iop.org/article/10.1088/0004-637X/718/2/647/pdf |
| Ending Page | 656 |
| Page Count | 10 |
| Starting Page | 647 |
| ISSN | 0004637X |
| DOI | 10.1088/0004-637x/718/2/647 |
| Journal | The Astrophysical Journal |
| Issue Number | 2 |
| Volume Number | 718 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2010-07-02 |
| Access Restriction | Open |
| Subject Keyword | Journal: The Astrophysical Journal Astronomy and Astrophysics White Dwarf High Resolution Space Telescope |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
