文章基本信息

标题：The slowly pulsating B-star 18 Pegasi: A testbed for upper main sequence stellar evolution
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作者：A. Irrgang ; A. Irrgang ; A. Desphande 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：591
页码：1-14
DOI：10.1051/0004-6361/201628844
语种：English
出版社：EDP Sciences
摘要：The predicted width of the upper main sequence in stellar evolution models depends on the empirical calibration of the convective overshooting parameter. Despite decades of discussions, its precise value is still unknown and further observational constraints are required to gauge it. Based on a photometric and preliminary asteroseismic analysis, we show that the mid B-type giant 18 Peg is one of the most evolved members of the rare class of slowly pulsating B-stars and, thus, bears tremendous potential to derive a tight lower limit for the width of the upper main sequence. In addition, 18 Peg turns out to be part of a single-lined spectroscopic binary system with an eccentric orbit that is greater than 6 years. Further spectroscopic and photometric monitoring and a sophisticated asteroseismic investigation are required to exploit the full potential of this star as a benchmark object for stellar evolution theory.
关键词：binaries: spectroscopic;stars: early-type;stars: individual: 18 Peg;stars: oscillations