Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Citations to the Article (36) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (5)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
MOST Detects g-Modes in the Be Star HD 163868
Authors:
Walker, G. A. H.; Kuschnig, R.; Matthews, J. M.; Cameron, C.; Saio, H.; Lee, U.; Kambe, E.; Masuda, S.; Guenther, D. B.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W.
Affiliation:
AA(1234 Hewlett Place, Victoria, BC V8S 4P7, Canada; .), AB(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada; , , .), AC(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada; , , .), AD(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada; , , .), AE(Astronomical Institute, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan; , .), AF(Astronomical Institute, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan; , .), AG(Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan; .), AH(Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata-cho, Okayama 719-0232, Japan; .), AI(Department of Astronomy and Physics, St. Mary's University, Halifax, NS B3H 3C3, Canada; .), AJ(Observatoire du mont Mégantic, Département de physique, Université de Montréal C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada; .), AK(Department of Astronomy and Astrophysics, David Dunlap Observatory, University of Toronto P.O. Box 360, Richmond Hill, ON L4C 4Y6, Canada; .), AL(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; .), AM(Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria; .)
Publication:
The Astrophysical Journal, Volume 635, Issue 1, pp. L77-L80. (ApJL Homepage)
Publication Date:
12/2005
Origin:
UCP
ApJ Keywords:
Stars: Early-Type, Stars: Emission-Line, Be, stars: individual (HD 163868), Stars: Oscillations, Stars: Rotation
DOI:
10.1086/499362
Bibliographic Code:
2005ApJ...635L..77W

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.

Based on data from the MOST satellite, a Canadian Space Agency mission, jointly operated by Dynacon, Inc., the University of Toronto Institute of Aerospace Studies, and the University of British Columbia, with the assistance of the University of Vienna.


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints