منابع مشابه
A new magnetic white dwarf: PG 2329+267
We have discovered that the white dwarf PG 2329+267 is magnetic, and, assuming a centred dipole structure, has a dipole magnetic field strength of approximately 2.3 MG. This makes it one of only approximately 4 per cent of isolated white dwarfs with a detectable magnetic field. Linear Zeeman splitting, as well as quadratic Zeeman shifts, is evident in the hydrogen Balmer sequence and circular s...
متن کاملPG 1541 + 650 : A new ZZ Ceti white dwarf ?
We report the discovery of a new pulsating DA white dwarf, or ZZ Ceti, from the list of the Palomar-Green survey, rediscovered in the ongoing Hamburg Quasar survey (HQS). PG1541+650 is one of the ZZ Ceti candidates listed in the analysis of 80 DA white dwarfs from the HQS. With an effective temperature of 12000 K, for a surface gravity logg=7.79, it lies in the ZZ Ceti instability strip. It is ...
متن کاملThe Pulsating Pre { White Dwarf Star PG 0122 + 200
We present an analysis of single{site time{series photometry of the pulsating pre{white dwarf PG 0122+200. We show the pulsations are consistent with a pattern of modes equally spaced in period; both the observed period range and spacing con rm that PG 0122 is a g{mode pulsator. PG 0122 shows a pattern similar to that seen in multi{site observations of PG 2131+066 and PG 1159{035. The measured ...
متن کامل0 PG 2131 + 066 : A Test of Pre - White Dwarf Asteroseismology
PG 2131+066 is a composite–spectrum binary with a hot pulsating PG 1159-type pre–white dwarf and an early M-type main sequence star. Analysis of Whole Earth Telescope observations of the pulsating pre-white dwarf component provided an asteroseismological determination of its mass, luminosity, and effective temperature. These determinations allowed Kawaler et al. (1995) to determine the distance...
متن کاملSoft X - ray Spectroscopy of the Hot DA White Dwarf LB 1919 and the PG 1159 Star PG 1520 + 525
We have performed soft X-ray spectroscopy of two hot white dwarfs with the Chandra observatory using the Low Energy Transmission Grating. The first target is the hot DA white dwarf LB1919 (T eff =69 000 K). This star is representative of a small group of hot DAs whose metallicities lie well below predictions from radiative levitation theory. The Chandra spectrum shows a rich absorption line spe...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1998
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.1998.01763.x