2010ApJ...718..647D -
Astrophys. J., 718, 647-656 (2010/August-1)
Multiwavelength observations of the hot DB star PG 0112+104.
DUFOUR P., DESHARNAIS S., WESEMAEL F., CHAYER P., LANZ T., BERGERON P., FONTAINE G., BEAUCHAMP A., SAFFER R.A., KRUK J.W. and LIMOGES M.-M.
Abstract (from CDS):
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.
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Journal keyword(s):
white dwarfs
Simbad objects:
7
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