The variable “hybrid” PG 1159 star HS 2324+3944
نویسندگان
چکیده
منابع مشابه
ABELL 43 , a second pulsating “ hybrid - PG 1159 ” star ⋆
An abstract should be given e report observations of the planetary nebula nucleus Abell 43, obtained at the 2.5m Nordic Optical Telescope, which show that it is a pulsator. Abell 43, a " hybrid-PG 1159 " type star, is the second pulsator of this class, after HS 2324+3944. From the limited data set acquired, we find that Abell 43 exhibits at least two periods of 2600 s and 3035 s, the longest on...
متن کاملThe photometric behaviour of the peculiar PG 1159 star HS 2324 + 3944 at high frequency resolution ?
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...
متن کاملThe photometric behaviour of the peculiar PG 1159 star HS 2324 + 3944 at high frequency resolution ⋆
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 peak...
متن کاملHS 2324 + 3944 : discovery of non - radial pulsations in a hydrogen - rich PG 1159 star ⋆
HS2324+3944 is a peculiar PG1159 star, with a high amount of H in its atmosphere (Dreizler et al. 1995). Its location in the logTeff – log g plane is well inside the GW Vir instability strip. In this paper I report the results of two photoelectric observations of HS 2324+39, which clearly show that the luminosity of this star presents periodical variations with a period of (2140 ± 11) s. This p...
متن کاملThe Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43
We extend our previous pulsational stability analyses of PG 1159 stars by modeling the hybrid PG 1159 type star Abell 43. We show that the standard κ-mechanism due to the ionization of C and O in the envelope of this H-rich PG 1159 star is perfectly able to drive g-mode pulsations. Thus, contrary to a recent suggestion, there is no need to invoke any new or exotic mechanism to explain the pulsa...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1997
ISSN: 0074-1809
DOI: 10.1017/s0074180900129985