Towards ensemble asteroseismology of the young open clusters χ Persei and NGC 6910

Sophie Saesen,Andrzej Pigulski,Fabien Carrier,Gabriela Michalska,Conny M. Aerts,Joris De Ridder,Maryline Briquet,Gerald Handler,Zbigniew Kołaczkowski,Bram Acke,Eva Bauwens,Paul G. Beck,Y. Blom,Joris A D L Blommaert,E. Broeders,Marc Cherix,Geert Davignon,Jonas Debosscher,Pieter Degroote,Leen Decin,S. Dehaes,W. De Meester,Pieter D. Deroo,Michèle Desmet,Rachel Drummond,Joesph R. Eggen,Jianning Fu,Kosmas D. Gazeas,G. A. Gelven,Clio Gielen,Rik Huygen,Xiaojun Jiang,Belinda Kalomeni,Seunglee Kim, D. H. Kim,Grzegorz Kopacki,J. H. Kwon,Djazia Ladjal,Chunguk Lee,Young J. Lee,Karolien Lefever,A. Leitner,Patrick Lenz,Alexios Liakos,D. Lorenz,Artur Narwid,Panagiotis G. Niarchos,Roy H. Østensen,Ennio Poretti,Saskia Prins,Judi L. Provençal,E. Puga Antolín,Johannes Puschnig,Gert Raskin,Mike D. Reed,Maarten Reyniers,Edward G. Schmidt,L. Schmitzberger,Maxime Spáno,B. Steininger, M. SteeLicki,Katrien Uytterhoeven,J. Vanautgaerden,Bart K. Vandenbussche,V. Van Helshoecht,E. Vanhollebeke,Hans Van Winckel,Tijl Verhoelst,Maja Vučković,Ch Waelkens,George W. Wolf,Kadri Yakut,Chao Zhang,Wolfgang Zima

ASTRONOMISCHE NACHRICHTEN（2010）

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摘要

As a result of the variability survey in chi Persei and NGC 6910, the number of beta Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC 6910 and eleven in chi Persei. We compare pulsational properties, in particular the frequency spectra, of beta Cep stars in both clusters and explain the differences in terms of the global parameters of the clusters. We also indicate that the more complicated pattern of the variability among B-type stars in chi Persei is very likely caused by higher rotational velocities of stars in this cluster. We conclude that the sample of pulsating stars in the two open clusters constitutes a very good starting point for the ensemble asteroseismology of beta Cep-type stars and maybe also for other B-type pulsators. (C) 2010 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim

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关键词

techniques: photometric,stars: oscillations,open clusters and associations: individual (chi Per, NGC 6910)

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