• Michael BREGER (Ed.)

Communications in Asteroseismology Volume 162, 2011

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Die Serie Communications in Asteroseismology (CoAst) stellt eine international gefragte Plattform für wissenschaftliche Publikationen der neuesten Forschungsergebnisse auf dem Gebiet der Asteroseismologie dar. Forschungsgegenstand der Asteroseismologie sind veränderliche und pulsierende Sterne. Neben den halbjährlich erscheinenden regulären Ausgaben mit Beiträgen aus der laufenden Forschung werden auch Sonderausgaben für Konferenzberichte bzw. Programmhandbücher herausgegeben.

Contents

Analyses of Crawford’s uvby ß calibrations using the pulsational variations of FG Vir by P.Haas
A spectroscopic study of the hybrid pulsator γ Pegasi by C. P. Pandey, T.Morel, M. Briquet, et al.
Frequency analysis of five short periodic pulsators by A. Liakos, P.Niarchos
Update and Additional Frequencies for Kepler Star KIC 970032 by Joyce A. Guzik, Michel Breger
New pulsation analysis of the oscillating Eclipsing Binary BG Peg by A. Liakos, P.Niarchos

…

The publication series of Communications in Asteroseismology (CoAst) is one of the most important international journals in the field of asteroseismology. Asteroseismology is the science of variable and pulsating stars. Every six months CoAst publishes a newsletter with papers on ongoing research projects. Besides these regular issues, special issues such as conference proceedings or program manuals are published in this series.



Verlag der Österreichischen Akademie der Wissenschaften
Austrian Academy of Sciences Press
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https://verlag.oeaw.ac.at, e-mail: verlag@oeaw.ac.at

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Communications in Asteroseismology Volume 162, 2011


ISBN 978-3-7001-7154-6
Print Edition
ISBN 978-3-7001-7223-9
Online Edition



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Verlag der Österreichischen Akademie der Wissenschaften
Austrian Academy of Sciences Press
A-1011 Wien, Dr. Ignaz Seipel-Platz 2,
Tel. +43-1-515 81/DW 3420, Fax +43-1-515 81/DW 3400
https://verlag.oeaw.ac.at, e-mail: bestellung.verlag@oeaw.ac.at
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A spectroscopic study of the hybrid pulsator γ Pegasi

    C.P. Pandey, T. Morel, M. Briquet, S. Bisht, B.B. Sanwal

Communications in Asteroseismology 162, pp. 21-50, 2011/11/30

doi: 10.1553/cia162s21

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doi:10.1553/cia162



doi:10.1553/cia162s21


Abstract

The recent detection of both pressure and high-order gravity modes in the classical B-type pulsator Pegasi offers promising prospects for probing its internal structure through seismic studies. To aid further modelling of this star, we present the results of a detailed NLTE abundance analysis based on a large number of time-resolved, high-quality spectra. A chemical composition typical of nearby B-type stars is found. The hybrid nature of this star is consistent with its location in the overlapping region of the instability strips for ß Cephei and slowly pulsating B stars computed using OP opacity tables, although OPAL calculations may also be compatible with the observations once the uncertainties in the stellar parameters and the current limitations of the stability calculations are taken into account. The two known frequencies f1 = 6.58974 and f2 = 0.68241 d-1 are detected in the spectroscopic time series. A mode identification is attempted for the low-frequency signal, which can be associated to a high-order g-mode. Finally, we re-assess the binary status of γ Peg and find no evidence for variations that can be ascribed to orbital motion, contrary to previous claims in the literature.

Published Online: 2011/11/30 13:17:16

Object Identifier: 0xc1aa5572 0x0029e6e5

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