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29 March 2024
 
  » arxiv » astro-ph/9907262

 Article overview


Spectral analysis of the multi mode pulsating subluminous B star PG1605+072
U. Heber ; I.N. Reid ; K. Werner ;
Date 20 Jul 1999
Subject astro-ph
AffiliationDr. Remeis-Sternwarte Bamberg, Germany), I.N. Reid (Palomar Observatory, Pasadena, USA), K. Werner (Universitaet Tuebingen, USA
AbstractPG 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 (Teff, log g, log(He/H)), metal abundances, and the rotational velocity are determined. He, C, N and O are subsolar as well as the intermediate mass elements Mg and Si, whereas Ne and Fe are solar. This abundance pattern is caused by diffusion. PG 1605+072 displays considerable line broadening probably caused by rotation (vsini = 39km/s, P<8.7h) and, therefore, is predicted to evolve into an unusually fast rotating white dwarf. Unequal rotational splitting may explain its puzzling pulsation pattern. The solar Fe abundance and the rapid rotation nicely confirms recent predictions of diffusion/pulsation models.
Source arXiv, astro-ph/9907262
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