Most detects SPBe pulsations in HD 127756 and HD 217543: Asteroseismic rotation rates independent of v sin i1

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

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The MOST (Microvariability and Oscillations of Stars ) satellite has discovered SPBe (slowly pulsating Be) oscillations in the stars HD 127756 (B1/B2 Vne) and HD 217543 (B3 Vpe). For HD 127756, 30 significant frequencies are identified from 31 days of nearly continuous photometry; for HD 217543, up to 40 significant frequencies from 26 days of data. In both cases, the oscillations fall into three distinct frequency ranges, consistent with models of the stars. The variations are caused by nonradial g-modes (and possibly r-modes) distorted by rapid rotation and excited by the opacity mechanism near the iron opacity bump. A comparison of pulsation models and observed frequency groups yields a rotation frequency for each star, independently of v sin i. The rotation rates of these stars, as well as those of the SPBe stars previously discovered by MOST, HD 163868 and β CMi, are all close to their critical values.

Original languageEnglish
Pages (from-to)489-507
Number of pages19
JournalAstrophysical Journal
Volume685
Issue number1
DOIs
Publication statusPublished - 2008 Sep 20

Keywords

  • Stars: early-type
  • Stars: emission-line, Be
  • Stars: individual (HD 127756, HD 217543, HD 163868, β CMi)
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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