ASTEROSEISMOLOGY OF HYBRID PULSATORS MADE POSSIBLE: SIMULTANEOUS MOST SPACE PHOTOMETRY AND GROUND-BASED SPECTROSCOPY OF γ PEG

被引：41

作者：

Handler, G. ^{[1
]}

Matthews, J. M. ^{[2
]}

Eaton, J. A. ^{[3
]}

Daszynska-Daszkiewicz, J. ^{[4
]}

Kuschnig, R. ^{[1
]}

Lehmann, H. ^{[5
]}

Rodriguez, E. ^{[6
]}

Pamyatnykh, A. A. ^{[1
,8
]}

Zdravkov, T. ^{[7
]}

Lenz, P. ^{[1
]}

Costa, V. ^{[6
]}

Diaz-Fraile, D. ^{[6
]}

Sota, A. ^{[6
]}

Kwiatkowski, T. ^{[9
]}

Schwarzenberg-Czerny, A. ^{[7
]}

Borczyk, W. ^{[9
]}

Dimitrov, W. ^{[9
]}

Fagas, M. ^{[9
]}

Kaminski, K. ^{[9
]}

Rozek, A. ^{[9
]}

van Wyk, F. ^{[10
]}

Pollard, K. R. ^{[11
]}

Kilmartin, P. M. ^{[11
]}

Weiss, W. W. ^{[1
]}

Guenther, D. B. ^{[12
]}

Moffat, A. F. J. ^{[13
]}

Rucinski, S. M. ^{[14
]}

Sasselov, D. D. ^{[15
]}

Walker, G. A. H.

机构：

[1] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[3] Tennessee State Univ, Ctr Excellence Informat Syst, Nashville, TN 37209 USA

[4] Uniwersytet Wroclawski, Inst Astron, PL-51622 Wroclaw, Poland

[5] Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany

[6] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain

[7] Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[8] Russian Acad Sci, Inst Astron, Moscow 109017, Russia

[9] Adam Mickiewicz Univ Poznan, Astron Observ, PL-60286 Poznan, Poland

[10] S African Astron Observ, ZA-7935 Cape Town, South Africa

[11] Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand

[12] St Marys Univ, Dept Phys & Astron, Halifax, NS B3H 3C3, Canada

[13] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[14] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[15] Harvard Univ, Dept Astron, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 698卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

binaries: spectroscopic; stars: early-type; stars: individual (gamma Peg); stars: oscillations; stars: variables: other; BETA-CEPHEI STARS; B-TYPE PULSATORS; NU-ERIDANI; PULSATIONS; ABUNDANCE;

D O I：

10.1088/0004-637X/698/1/L56

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid beta Cep/Slowly Pulsating B pulsator gamma Peg. Frequency analyses reveal the presence of six gravity (g) modes of high radial order together with eight low-order beta Cep oscillations in both data sets. Mode identification shows that all pulsations have spherical degrees l = 0-2. An 8.5 M(circle dot) model reproduces the observed pulsation frequencies; all theoretically predicted modes in the beta Cep domain are detected. We suggest, contrary to previous authors, that gamma Peg is a single star; the claimed orbital variations are due to g-mode pulsation. gamma Peg is the first hybrid pulsator for which a sufficiently large number of high-order g modes and low-order pressure (p) and mixed modes have been detected and identified to be usable for in-depth seismic modeling.

引用

页码：L56 / L59

页数：4

共 19 条

[1] Line formation in solar granulation - IV. [O I], OI and OH lines and the photospheric O abundance [J].