2009A&A...506..269B


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST16:26:47

2009A&A...506..269B - Astronomy and Astrophysics, volume 506, 269-280 (2009/10-4)

Ground-based observations of the β Cephei CoRoT main target HD 180642: abundance analysis and mode identification.

BRIQUET M., UYTTERHOEVEN K., MOREL T., AERTS C., DE CAT P., MATHIAS P., LEFEVER K., MIGLIO A., PORETTI E., MARTIN-RUIZ S., PAPARO M., RAINER M., CARRIER F., GUTIERREZ-SOTO J., VALTIER J.-C., BENKO J.M., BOGNAR Zs., NIEMCZURA E., AMADO P.J., SUAREZ J.C., MOYA A., RODRIGUEZ-LOPEZ C. and GARRIDO R.

Abstract (from CDS):

The known βCephei star HD180642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time (Degroote and collaborators). In this paper, we obtain additional constraints for forthcoming asteroseismic modeling of the target. Our results are based on both extensive ground-based multicolour photometry and high-resolution spectroscopy. We determine Teff=24500±1000K and logg=3.45±0.15dex from spectroscopy. The derived chemical abundances are consistent with those for B stars in the solar neighbourhood, except for a mild nitrogen excess. A metallicity Z=0.0099±0.0016 is obtained. Three modes are detected in photometry. The degree l is unambiguously identified for two of them: l= 0 and l= 3 for the frequencies 5.48694/d and 0.30818/d, respectively. The radial mode is non-linear and highly dominant with an amplitude in the U-filter about 15 times larger than the strongest of the other modes. For the third frequency of 7.36673/d found in photometry, two possibilities remain: l=0 or 3. In the radial velocities, the dominant radial mode presents a so-called stillstand but no clear evidence of the existence of shocks is observed. Four low-amplitude modes are found in spectroscopy and one of them, with frequency 8.4079d–1, is identified as (l,m)=(3,2). Based on this mode identification, we finally deduce an equatorial rotational velocity of 38±15km/s.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: early-type - stars: oscillations - stars: individual: HD180642

Simbad objects: 13

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Number of rows : 13

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 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 365 0
2 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 366 0
3 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 683 0
4 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 298 0
5 * 19 Mon bC* 07 02 54.7766724 -04 14 21.237679 3.87 4.80 5.00 5.06 5.25 B2Vn(e) 181 0
6 * eps Cen bC* 13 39 53.25774 -53 27 59.0081 1.16 2.08 2.30 2.45 2.70 B1III 239 0
7 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 O9.5(V)+B7(V) 825 0
8 * tet Oph bC* 17 22 00.5793468 -24 59 58.366974 2.18 3.03 3.26 3.38 3.58 OB 315 0
9 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 91 0
10 HD 181414 PM* 19 20 19.4881180741 +04 46 40.401978148 7.310 7.180 7.060     A2V 20 0
11 V* BW Vul bC* 20 54 22.3949148537 +28 31 19.182736153 5.47 6.40 6.54     B2IIIv 284 0
12 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 683 0
13 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 344 0

    Equat.    Gal    SGal    Ecl

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2020.08.08-16:26:47

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