2013A&A...551A..12T


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.15CET04:32:36

2013A&A...551A..12T - Astronomy and Astrophysics, volume 551A, 12-12 (2013/3-1)

High-precision CoRoT space photometry and fundamental parameter determination of the B2.5V star HD 48977.

THOUL A., DEGROOTE P., CATALA C., AERTS C., MOREL T., BRIQUET M., HILLEN M., RASKIN G., VAN WINCKEL H., AUVERGNE M., BAGLIN A., BAUDIN F. and MICHEL E.

Abstract (from CDS):

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 Teff=20000±1000K and logg=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.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: individual: HD 48977 - stars: abundances - stars: fundamental parameters - stars: oscillations - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/551/A12): table1.dat>

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 43317 Pu* 06 15 47.0136233779 +04 17 01.097508973 5.82 6.456 6.614     B3IV 86 0
2 * 16 Mon SB* 06 46 32.4144659902 +08 35 13.781782532   5.76 5.92     B3V 86 0
3 V* V448 Car LP* 06 47 18.7079861154 -55 32 23.965947396   7.19 5.61     K5III 21 0
4 HD 50230 Pu* 06 52 19.8149287598 -00 40 38.956577604   8.93 8.95     B3III 44 0
5 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 89 0

    Equat.    Gal    SGal    Ecl

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2019.12.15-04:32:36

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