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 (31) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Pulsations of the Oe Star ζ Ophiuchi from MOST Satellite Photometry and Ground-based Spectroscopy
Authors:
Walker, G. A. H.; Kuschnig, R.; Matthews, J. M.; Reegen, P.; Kallinger, T.; Kambe, E.; Saio, H.; Harmanec, P.; Guenther, D. B.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W.; Bohlender, D. A.; Božić, H.; Hashimoto, O.; Koubský, P.; Mann, R.; Ruždjak, D.; Škoda, P.; Šlechta, M.; Sudar, D.; Wolf, M.; Yang, S.
Affiliation:
AA(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, 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(Institut für Astronomie, Universität Wien Türkenschanzstrasse 17, A-1180 Vienna, Austria.), AE(Institut für Astronomie, Universität Wien Türkenschanzstrasse 17, A-1180 Vienna, Austria.), AF(Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan.), AG(Graduate School of Science, Astronomical Institute, Tohoku University, Sendai 980-8578, Japan.), AH(Astronomical Institute of the Charles University, V Holešovičkách 2, CZ-180 00 Prague 8, Czech Republic; .; Astronomical Institute, Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic.), AI(Department of Astronomy and Physics, St. Mary's University, Halifax, NS B3H 3C3, Canada.), AJ(Mont Mégantic Observatory, Département de Physique, University de Montréal CP 6128, Succursale Centreville, 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 Vienna, Austria.), AN(National Research Council of Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada.), AO(Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia.), AP(Gunma Astronomical Observatory, 6860-86 Nakayama, Takayama, Gunma 377-0702, Japan.), AQ(Astronomical Institute, Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic.), AR(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055 Station CSC, Victoria, BC V8W 3P6, Canada.), AS(Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia.), AT(Astronomical Institute, Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic.), AU(Astronomical Institute, Academy of Sciences, CZ-251 65 Ondřejov, Czech Republic.), AV(Hvar Observatory, Faculty of Geodesy, Zagreb University, 10000 Zagreb, Croatia.), AW(Astronomical Institute of the Charles University, V Holešovičkách 2, CZ-180 00 Prague 8, Czech Republic; .), AX(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055 Station CSC, Victoria, BC V8W 3P6, Canada.)
Publication:
The Astrophysical Journal, Volume 623, Issue 2, pp. L145-L148. (ApJL Homepage)
Publication Date:
04/2005
Origin:
UCP
ApJ Keywords:
Line: Profiles, Stars: Early-Type, Stars: Emission-Line, Be, Stars: Individual: Constellation Name: ζ Ophiuchi, Stars: Oscillations, Stars: Rotation
DOI:
10.1086/430254
Bibliographic Code:
2005ApJ...623L.145W

Abstract

Twenty-four days of highly precise Microvariability and Oscillations of Stars (MOST) satellite photometry obtained in mid-2004 of the rapidly rotating O9.5 V star ζ Oph have yielded at least a dozen significant oscillation frequencies between 1 and 10 cycles day-1, clearly indicating its relationship to β Cephei variables. Eight periods were found in He I λ4922 and Hβ line profile variations (LPV) of which six coincide with those from the MOST photometry. This unique photometric and spectroscopic detection of radial and nonradial pulsations leads to a plausible model in which high l-modes are excited when their frequencies in the corotating frame are similar to those of low-order radial modes. We propose that the dominant photometric 4.6 hr period (f1) corresponds to a radial first overtone excited by the κ-mechanism associated with the Fe opacity bump. No unambiguous rotational period can be identified in either the light curve or the LPV.

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