Most detects g-modes in the late-type Be star β canis minoris (B8 Ve)

Hideyuki Saio, C. Cameron, R. Kuschnig, G. A.H. Walker, J. M. Matthews, J. F. Rowe, U. Lee, D. Huber, W. W. Weiss, D. B. Guenther, A. F.J. Moffat, S. M. Rucinski, D. Sasselov

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40 Citations (Scopus)

Abstract

The Microvariability and Oscillations of Stars (MOST) satellite has detected low-amplitude light variations (Δm ∼ 1 mmag) in the Be star β CMi (B8 Ve). The observations lasted 41 days and the variations have typical periods ∼0.3 days. We demonstrate that the dominant frequencies are consistent with prograde high-order g-modes of m = -1 excited by the Fe bump of opacity in an intermediate-mass (≈3.5 M) star with a nearly critical rotation period of 0.38 days. This is the first detection of nonradial g-mode pulsations in a Be star later than B6 leading to the possibility that pulsations are excited in all classical Be stars.

Original languageEnglish
Pages (from-to)544-550
Number of pages7
JournalAstrophysical Journal
Volume654
Issue number1 I
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • Stars: early-type
  • Stars: emission-line, Be
  • Stars: individual (β Canis Minoris)
  • Stars: oscillations
  • Stars: rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Saio, H., Cameron, C., Kuschnig, R., Walker, G. A. H., Matthews, J. M., Rowe, J. F., Lee, U., Huber, D., Weiss, W. W., Guenther, D. B., Moffat, A. F. J., Rucinski, S. M., & Sasselov, D. (2007). Most detects g-modes in the late-type Be star β canis minoris (B8 Ve). Astrophysical Journal, 654(1 I), 544-550. https://doi.org/10.1086/509315