2011A&A...528A.123P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET20:03:47

2011A&A...528A.123P - Astronomy and Astrophysics, volume 528A, 123-123 (2011/4-1)

CoRoT high-precision photometry of the B0.5IV star HD 51756.

PAPICS P.I., BRIQUET M., AUVERGNE M., AERTS C., DEGROOTE P., NIEMCZURA E., VUCKOVIC M., SMOLDERS K., PORETTI E., RAINER M., HARETER M., BAGLIN A., BAUDIN F., CATALA C., MICHEL E. and SAMADI R.

Abstract (from CDS):

OB stars are important constituents for the ecology of the Universe, and there are only a few studies on their pulsational properties detailed enough to provide important feedback on current evolutionary models. Our goal is to analyse and interpret the behaviour present in the CoRoT light curve of the B0.5IV star HD51756 observed during the second long run of the space mission and to determine the fundamental stellar parameters from ground-based spectroscopy gathered with the Coralie and Harps instruments after checking for signs of variability and binarity, thus making a step further in mapping the top of the βCep instability strip.We compared the newly obtained high-resolution spectra with synthetic spectra of late O-type and early B-type stars computed on a grid of stellar parameters. We matched the results with evolutionary tracks to estimate stellar parameters. We used various time series analysis tools to explore the nature of the variations present in the light curve. Additional calculations were carried out based on distance and historical position measurements of the components to impose constraints on the binary orbit.We find that HD51756 is a wide binary with both a slow (vsini≃28km/s) and a fast (vsini≃170km/s) early-B rotator whose atmospheric parameters are similar (Teff≃30000K and logg≃3.75). We are unable to detect pulsation in any of the components, and we interpret the harmonic structure in the frequency spectrum as a sign of rotational modulation, which is compatible with the observed and deduced stellar parameters of both components.The non-detection of pulsation modes provides a feedback on the theoretical treatment, given that non-adiabatic computations applied to appropriate stellar models predict the excitation of both pressure and gravity modes for the fundamental parameters of this star.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: early-type - stars: oscillations - stars: individual: HD 51756 - stars: rotation - binaries: spectroscopic

Simbad objects: 11

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Number of rows : 11

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 NAME Gal Anticenter reg 06 17 +22.5           ~ 694 0
2 HD 46149 SB* 06 31 52.5314050362 +05 01 59.186016432 7.03 7.80 7.61 7.54 7.36 O8.5V 253 0
3 HD 46202 ** 06 32 10.4728 +04 57 59.818 7.60 8.36 8.19 7.98 7.86 O9.2V 253 0
4 HD 49330 Be* 06 47 57.2678873802 +00 46 34.039802717 8.45 9.14 8.95     Bnn(e) 68 0
5 HD 50230 Pu* 06 52 19.8149287598 -00 40 38.956577604   8.93 8.95     B3III 43 0
6 BFS 55 HII 06 57.2 -02 48           ~ 4 0
7 HD 51756 ** 06 58 28.16142 -03 01 25.3628 6.15 7.08 7.18     B1/2Ib 51 1
8 * mu. Cen Be* 13 49 36.9886294 -42 28 25.429594 2.37 3.27 3.43 3.41 3.50 B2Vnpe 409 0
9 * 64 Ser Be* 18 57 16.5896724356 +02 32 07.250994190 5.29 5.545 5.551     B8/9II 102 0
10 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 89 0
11 HD 181231 Be* 19 19 42.3696937649 -00 02 59.484454353   8.79 8.58     B5III 25 0

    Equat.    Gal    SGal    Ecl

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2019.12.07-20:03:47

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