Most detects g-modes in the Be star HD 163868
- Author(s)
- Gordon A. H. Walker, Rainer Kuschnig, Jaymie M. Matthews, Chris Cameron, Hideyuki Saio, U. Lee, E Kambe, Seiji Masuda, David B. Guenther, Anthony F J Moffat, Slavek M. Rucinski, Dimitar Sasselov, Werner Wolfgang Weiss
- Abstract
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. Π2005. The American Astronomical Society. All rights reserved.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of British Columbia (UBC), Tohoku University, National Defense Academy of Japan, National Astronomical Observatory of Japan, Saint Mary's University, University of Montreal, University of Toronto, Harvard-Smithsonian Center for Astrophysics
- Journal
- The Astrophysical Journal: an international review of astronomy and astronomical physics
- Volume
- 635
- ISSN
- 0004-637X
- Publication date
- 2005
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/009cff49-7e10-47c8-a53a-daf7e31c6da9