2011A&A...527A.112B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:12:09

2011A&A...527A.112B - Astronomy and Astrophysics, volume 527A, 112-112 (2011/3-1)

An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry.

BRIQUET M., AERTS C., BAGLIN A., NIEVA M.F., DEGROOTE P., PRZYBILLA N., NOELS A., SCHILLER F., VUCKOVIC M., OREIRO R., SMOLDERS K., AUVERGNE M., BAUDIN F., CATALA C., MICHEL E. and SAMADI R.

Abstract (from CDS):

The O9V star HD46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the very high-precision light curve, we clearly detect β Cep-like pulsation frequencies with amplitudes of ∼0.1mmag and below. A comparison with stellar models was performed using a χ2 as a measure for the goodness-of-fit between the observed and theoretically computed frequencies. The physical parameters of our best-fitting models are compatible with the ones deduced spectroscopically. A core overshooting parameter αov=0.10±0.05 pressure scale height is required. None of the observed frequencies are theoretically excited with the input physics used in our study. More theoretical work is thus needed to overcome this shortcoming in how we understand the excitation mechanism of pulsation modes in such a massive star. A similar excitation problem has also been encountered for certain pulsation modes in β Cep stars recently modelled asteroseismically.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: oscillations - stars: variables: general - stars: early-type - stars: individual: HD 46202

Simbad objects: 15

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Number of rows : 15

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 * ksi Per ** 03 58 57.9022917 +35 47 27.713205 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 789 0
2 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 366 0
3 NAME Rosette Nebula HII 06 31 40 +04 57.8           ~ 443 1
4 HD 46149 SB* 06 31 52.5314050362 +05 01 59.186016432 7.03 7.80 7.61 7.54 7.36 O8.5V 256 0
5 NGC 2244 OpC 06 31 55 +04 56.5   5.26 4.8     ~ 563 4
6 HD 46202 ** 06 32 10.4728 +04 57 59.818 7.60 8.36 8.19 7.98 7.86 O9.2V 256 0
7 HD 47129 SB* 06 37 24.0417003671 +06 08 07.376246443 5.23 6.11 6.06     O8I+O7.5III 368 0
8 HD 49330 Be* 06 47 57.2678873802 +00 46 34.039802717 8.45 9.14 8.95     Bnn(e) 70 0
9 HD 93521 * 10 48 23.5116139485 +37 34 13.089937784 5.67 6.79 7.03     O9.5IIInn 402 1
10 * ome Sco bC* 16 06 48.4269211 -20 40 09.090235 3.10 3.92 3.97 3.91 3.99 B1V 436 0
11 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1723 2
12 * tet Oph bC* 17 22 00.5793468 -24 59 58.366974 2.18 3.03 3.26 3.38 3.58 OB 315 0
13 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 90 0
14 * lam Cep s*b 22 11 30.5750839949 +59 24 52.147736074 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 646 1
15 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 343 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:12:09

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