期刊
ASTRONOMY & ASTROPHYSICS
卷 551, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201118756
关键词
asteroseismology; stars: individual: HD 48977; stars: abundances; stars: fundamental parameters; stars: oscillations; techniques: photometric
资金
- Belspo
- European Research Council under the European Community [227224 (PROSPERITY)]
- Belgian Science Policy Office (Belspo) under PRODEX [C90309]
- National Science Foundation of the United States [NSF PHY05-51164]
- FNRS
- Fund for Scientific Research of Flanders (FWO), Belgium
- Research Council of K. U. Leuven, Belgium
- Fonds National de la Recherche Scientific (F.R.S.-FNRS), Belgium
- Royal Observatory of Belgium, the Observatoire de Geneve, Switzerland
- Thuringer Landessternwarte Tautenburg, Germany
We present the CoRoT light curve of the bright B2.5V star HD48977 observed during a short run of the mission in 2008, as well as a high-resolution spectrum gathered with the HERMES spectrograph at the Mercator telescope. We use several time series analysis tools to explore the nature of the variations in the light curve. We performed a detailed analysis of the spectrum of the star to determine its fundamental parameters and its element abundances. We find a large number of high-order g-modes, and one rotationally induced frequency. We find stable low-amplitude frequencies in the p-mode regime as well. We conclude that HD48977 is a new slowly pulsating B star with fundamental parameters found to be T-eff = 20 000 +/- 1000 K and log g = 4.2 +/- 0.1. The element abundances are similar to those found for other B stars in the solar neighbourhood. HD48977 was observed during a short run of the CoRoT satellite implying that the frequency precision is insufficient to perform asteroseismic modelling of the star. Nevertheless, we show that a longer time series of this star would be promising for such modelling. Our present study contributes to a detailed mapping of the instability strips of B stars in view of the dominance of g-mode pulsations in the star, several of which occur in the gravito-inertial regime.
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