Most detects g-modes in the Be star HD 163868

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

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


We have extracted a 37 day light curve with a precision of 0.0012 mag per point for the Microvariability and Oscillations of Stars (MOST) guide star, HD 163868 (B5 Ve). Its rich frequency spectrum resembles that of a slowly pulsating B (SPB) star but, being a rapid rotator, we designate it SPBe. The 60 most significant periods lie in three distinct groups centered on 8 days and 14 and 7 hr. We demonstrate that the 14 and 7 hr periods can be modeled by two swarms of high-order, prograde sectorial g-modes (m = -1, -2), which are destabilized by the iron opacity bump. Our model also predicts a group of r-modes with periods near 2.3 days, which correspond to frequencies observed in the tail of the 8 day group. The remaining periodicities, between 7 and 11 days, cannot be explained by unstable modes in our model.

Original languageEnglish
Pages (from-to)L77-L80
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2005 Dec 10
Externally publishedYes


  • Stars: early-type
  • Stars: emission-line, Be - Stars: individual (HD 163868)
  • Stars: oscillations
  • Stars: rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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