PG1159-035: A New, Hot, Non-DA Pulsating Degenerate
نویسندگان
چکیده
منابع مشابه
A fresh look into pulsating PG1159 stars
To improve the understanding of the pulsational instabilities of some of the PG1159-type pre-white dwarfs we performed detailed stability analyses on helium star evolutionary models. With the canonical chemical compositions, pulsational instabilities were encountered for all stellar masses considered (0.57, 0.63, 0.7 M⊙). The blue boundary agrees satisfactorily with observations. The red edge, ...
متن کاملA further look into the pulsating PG1159 stars
To improve our understanding of the pulsational instabilities found in some of the PG1159-type pre-white dwarfs we performed detailed nonradial stability analyses on heliumstar evolutionary models. Adopting canonical chemical compositions as derived from spectroscopic observations, we found pulsational instabilities for all stellar masses considered (0.57, 0.63, 0.7 M ). The blue boundary of th...
متن کاملThe Spectral Variability of Pulsating Stars : PG 1159 - 035
With 10m class telescopes as well as with time-tagging detectors on board of HST and FUSE, the analysis of time-resolved spectra for pulsating white dwarfs becomes feasible. We present simulated time-resolved spectra for the hot pulsating white dwarf PG 1159-035 and compare these models with observational data of the 516 s mode based on HST-STIS spectroscopy. A determination of the pulsation mo...
متن کاملErratum: Asteroseismological constraints on the pulsating planetary nebula nucleus (PG1159-type) RXJ2117.1+3412
Aims. We present asteroseismological inferences on RXJ2117.1+3412, the hottest known pulsating PG1159 star. Our results are based on full PG1159 evolutionary models recently presented by Miller Bertolami & Althaus (2006). Methods. We performed extensive computations of adiabatic g-mode pulsation periods on PG1159 evolutionary models with stellar masses ranging from 0.530 to 0.741M⊙. PG1159 stel...
متن کاملHot DAVs: a probable new class of pulsating white dwarf stars
We have discovered a pulsating DA white dwarf at the lower end of the temperature range 45 000–30 000 K where a few helium atmosphere white dwarfs are known. There are now three such pulsators known, suggesting that a new class of theoretically predicted pulsating white dwarf stars exists. We name them the hot DAV stars. From high-speed photometric observations with the ULTRACAM photometer on t...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1979
ISSN: 0252-9211
DOI: 10.1017/s0252921100076223