Time-Resolved Spectral Analysis of the Pulsating Helium Star V 652 Her
نویسندگان
چکیده
منابع مشابه
The chemical composition of the pulsating helium star V 652 Her ?
We present an analysis of an optical blue spectrum of the pulsating helium star V652 Her (=BD+13◦3224) in order to determine its effective temperature, surface gravity and chemical composition. By fitting synthetic spectra to the observations we find that for our spectrum Teff = 24 550 ± 500 K, log g = 3.68 ± 0.05 (cgs) and vt = 5 ± 5 km s−1. The surface gravity, together with a previous measur...
متن کاملTime resolved spectroscopy of the multiperiodic pulsating subdwarf B star PG 1605 + 072
We present results for the 2m spectroscopic part of the Multi-Site Spectroscopic Telescope campaign, which took place in May/June 2002. In order to perform an asteroseismological analysis on the multiperiodic pulsating subdwarf B star PG 1605+072 we used over 150 hours of time resolved spec-troscopy in order to search for and analyse line profile variations by using phase binning. We succeeded ...
متن کاملTime-resolved Spectroscopy and Spectrophotometry of the Pulsating Sdb Star Pg 1605+072
We present the latest results from our analysis of time resolved spectroscopy of PG 1605+072, a high amplitude pulsating sdB star. The star is believed to have evolved off the extreme horizontal branch, and it is uncertain whether it pulsates in por g-modes. Previous studies of PG 1605+072 have found amplitude variation and/or very closely spaced frequencies. We compare our velocity measurement...
متن کاملMode Identification of the Slowly Pulsating F 0 V Star
We have investigated the F0V star V398Aurigae (= 9 Aur) under the assumption that it is undergoing non-radial gravity mode oscillations and that the two principal periods given by Krisciunas et al. (1995) are correct. We find that the two periods are manifestations of an l = 3, |m| = 1 spheroidal mode and its toroidal corrections due to the rotation of the star. As far as we know, this is the f...
متن کاملSpectral analysis of the multi mode pulsating subluminous B star PG 1605 + 072
PG 1605+072 has unique pulsational properties amongst the members of the new class of pulsating sdB (EC 14026) stars. It has the longest periods and the richest, most puzzling frequency spectrum (55 periods). We present a quantitative analysis of a Keck HIRES spectrum using NLTE and LTE model atmospheres. Atmospheric parameters (T eff , log g, log nHe nH), metal abundances , and the rotational ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2002
ISSN: 0252-9211
DOI: 10.1017/s0252921100016766