Frequency variations in the PG 1159 pulsator PG 0122+200
نویسندگان
چکیده
منابع مشابه
The first PG 1159 close binary system
The archival spectrum of SDSS J212531.92-010745.9 shows not only the typical signature of a PG 1159 star, but also indicates the presence of a companion. With time-series photometry of SDSS J212531.92-010745.9 during 10 nights, spread over one month, with the Tübingen 80 cm and the Göttingen 50 cm telescopes, the binary nature of this object has recently been proven. An orbital period of 6.9 h ...
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The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB final thermal pulse that consumes the hydrogen envelope, exposing the usuallyhidden intershell region. Thus, the photospheric elemental abundances of these stars allow to draw conclusions about details of nuclear burning and mixing processes in the pre...
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The winds of the four PG 1159 stars NGC7094, NGC246, K 1-16 and RX J2117.1+3412 are investigated by means of non-LTE models for spherically expanding atmospheres. Based on the results of recent plane-parallel non-LTE analyses, several individual models with variousmass-loss rates are calculated. Synthetic profiles of the C iv resonance line are compared to high resolution, high quality HST and ...
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We present the results from 135 hours of nearly continuous time series photometry on the " hybrid " (H-rich) PG 1159 variable star HS 2324+3944, obtained in August– September 1997. The power spectrum of the data shows several frequencies (about 20 or more), concentrated in three narrow and very crowded regions near 475, 390 and 950 µHz in decreasing amplitude order. Most (if not all) of the pea...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2009
ISSN: 1742-6596
DOI: 10.1088/1742-6596/172/1/012063