2009A&A...506...95H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:01:57

2009A&A...506...95H - Astronomy and Astrophysics, volume 506, 95-101 (2009/10-4)

The B0.5IVe CoRoT target HD 49330. I. Photometric analysis from CoRoT data.

HUAT A.-L., HUBERT A.-M., BAUDIN F., FLOQUET M., NEINER C., FREMAT Y., GUTIERREZ-SOTO J., ANDRADE L., DE BATZ B., DIAGO P.D., EMILIO M., ESPINOSA LARA F., FABREGAT J., JANOT-PACHECO E., LEROY B., MARTAYAN C., SEMAAN T., SUSO J., AUVERGNE M., CATALA C., MICHEL E. and SAMADI R.

Abstract (from CDS):

Be stars undergo outbursts producing a circumstellar disk from the ejected material. The beating of non-radial pulsations has been put forward as a possible mechanism of ejection. We analyze the pulsational behavior of the early B0.5IVe star HD49330 observed during the first CoRoT long run towards the Galactical anticenter (LRA1). This Be star is located close to the lower edge of the β Cephei instability strip in the HR diagram and showed a 0.03 mag outburst during the CoRoT observations. It is thus an ideal case for testing the aforementioned hypothesis. We analyze the CoRoT light curve of HD49330 using Fourier methods and non-linear least square fitting. In this star, we find pulsation modes typical of β Cep stars (p modes) and SPB stars (g modes) with amplitude variations along the run directly correlated with the outburst. These results provide new clues about the origin of the Be phenomenon as well as strong constraints on the seismic modelling of Be stars.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: emission-line, Be - stars: individual: HD49330 - stars: rotation - stars: oscillations

VizieR on-line data: <Available at CDS (J/A+A/506/95): table3.dat table4.dat table5.dat table6.dat table7.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 49330 Be* 06 47 57.2678873802 +00 46 34.039802717 8.45 9.14 8.95     Bnn(e) 70 0
2 * ome CMa Be* 07 14 48.6538664 -26 46 21.609714 2.90 3.64 3.82 3.80 3.90 B2.5Ve 329 0
3 * mu. Cen Be* 13 49 36.9886294 -42 28 25.429594 2.37 3.27 3.43 3.41 3.50 B2Vnpe 411 0
4 * 66 Oph Be* 18 00 15.7982457 +04 22 07.016285 3.77 4.58 4.60 4.47 4.49 B2Ve 326 0
5 * ups Cyg Be* 21 17 55.0870156081 +34 53 48.769974820 3.50 4.32 4.42 4.37 4.45 B2Vne 300 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:01:58

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