منابع مشابه
The 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 کاملPlanet Limits around the Pulsating White Dwarf GD 66
We present infrared observations in search of a planet around the white dwarf, GD66. Timeseries photometry of GD66 shows a variation in the arrival time of stellar pulsations consistent with the presence of a planet with mass ≥2.4MJ. Any such planet is too close to the star to be resolved, but the planet’s light can be directly detected as an excess flux at 4.5μm. We observed GD66 with the two ...
متن کاملLimits on Planets Around Pulsating White Dwarf Stars
We present limits on planetary companions to pulsating white dwarf stars. A subset of these stars exhibit extreme stability in the period and phase of some of their pulsation modes; a planet can be detected around such a star by searching for periodic variations in the arrival time of these pulsations. We present limits on companions greater than a few Jupiter masses around a sample of 15 white...
متن کاملOn mode trapping in pulsating DA white dwarf stars
The present work is designed to explore the effects of the time-dependent element diffusion on the mode trapping properties of DA white dwarf models with various thickness of the hydrogen envelope. Our predictions are compared with the standard assumption of diffusive equilibrium in the trace element approximation. We find that element diffusion markedly weakens the presence of mode trapping or...
متن کاملThe asteroseismological potential of the pulsating DB white dwarf stars CBS 114 and PG 1456 + 103
We have acquired 65 h of single-site time-resolved CCD photometry of the pulsating DB white dwarf star CBS 114 and 62 h of two-site high-speed CCD photometry of another DBV, PG1456+103. The pulsation spectrum of PG1456+103 is complicated and variable on time scales of about one week and could only partly be deciphered with our measurements. The modes of CBS 114 are more stable in time and we we...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1995
ISSN: 0252-9211
DOI: 10.1017/s0252921100037908