New slowly pulsating B stars in the field of the young open cluster NGC2244 discovered by the MOST photometric satellite

D. Gruber, H. Saio, R. Kuschnig, L. Fossati, G. Handler, K. Zwintz, W. W. Weiss, J. M. Matthews, D. B. Guenther, A. F.J. Moffat, S. M. Rucinski, D. Sasselov

研究成果: Article査読

14 被引用数 (Scopus)

抄録

During two weeks of nearly continuous optical photometry of the young open cluster NGC2244 obtained by the Microvariability and Oscillations of STars (MOST) satellite, we discovered two new slowly pulsating B (SPB) stars, GSC 00154-00785 and GSC 00154-01871. We present frequency analyses of the MOST light curves of these stars, which reveal two oscillation frequencies (0.61 and 0.71 cycled -1) in GSC 00154-00785 and two (0.40 and 0.51 cycled -1) in GSC 00154-01871. These frequency ranges are consistent with g modes of ℓ≤ 2 excited in models of main-sequence or pre-main-sequence (PMS) stars of masses 4.5-5M and solar composition (X, Z) = (0.7, 0.02). Published proper motion measurements and radial velocities are insufficient to establish unambiguously cluster membership for these two stars. However, the PMS models which fit best their eigenspectra have ages consistent with NGC2244. If cluster membership can be confirmed, these would be the first known PMS SPB stars, and would open a new window on testing asteroseismically the interior structures of PMS stars.

本文言語English
ページ(範囲)291-298
ページ数8
ジャーナルMonthly Notices of the Royal Astronomical Society
420
1
DOI
出版ステータスPublished - 2012 2

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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