2019A&A...632A..95M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET21:53:34

2019A&A...632A..95M - Astronomy and Astrophysics, volume 632A, 95-95 (2019/12-0)

Ensemble asteroseismology of pulsating B-type stars in NGC 6910.

MOZDZIERSKI D., PIGULSKI A., KOLACZKOWSKI Z., MICHALSKA G., KOPACKI G., CARRIER F., WALCZAK P., NARWID A., STESLICKI M., FU J.-N., JIANG X.-J., ZHANG C., JACKIEWICZ J., TELTING J., MOREL T., SAESEN S., ZAHAJKIEWICZ E., BRUS P., SRODKA P., VUCKOVIC M., VERHOELST T., VAN HELSHOECHT V., LEFEVER K., GIELEN C., DECIN L., VANAUTGAERDEN J. and AERTS C.

Abstract (from CDS):

Asteroseismology offers the possibility of probing stellar interiors and testing evolutionary and seismic models. Precise photometry and spectroscopy obtained during multi-site campaigns on young open clusters allows discovering rich samples of pulsating stars and using them in a simultaneous seismic modelling called ensemble asteroseismology. The aim of this study is to obtain the age of the open cluster NGC 6910 by means of ensemble asteroseismology of the early-type pulsating members, to derive their stellar parameters, and to classify the excited modes. We used time-series analysis, performed photometric and spectroscopic mode identification, and calculated grids of evolutionary and seismic models to apply the procedure of ensemble asteroseismology for nine pulsating members of NGC 6910. With two iterations of the procedure of ensemble asteroseismology applied to nine pulsating stars we derived an age of 10.6–0.8+0.9Myr for NGC 6910. We also identified the degree l for 8 of 37 modes detected in these stars and classified all modes in terms of p, g, and mixed-mode pulsations. Of the nine pulsating stars examined in the paper, eight are β Cep stars, including three that are hybrid β Cep and slowly pulsating B-type (SPB) pulsators, and one is an SPB star. Interestingly, the least massive β Cep star, NGC 6910-38, has a mass of about 5.6M. The present theory does not predict unstable p modes in B-type stars with such a low mass. The g modes with relatively high frequencies (>3.5d–1), observed in three members of the cluster, are also stable according to seismic modelling. Both findings pose a challenge for theoretical calculations and prompt a revision of the opacities. The procedure of ensemble asteroseismology was found to be successful for NGC 6910 and χ Per on the basis of pulsating B-type stars and can therefore be applied to other young open clusters that are rich in such stars.

Abstract Copyright: © ESO 2019

Journal keyword(s): asteroseismology - stars: oscillations - stars: early-type - stars: fundamental parameters - open clusters and associations: individual: NGC 6910

VizieR on-line data: <Available at CDS (J/A+A/632/A95): stars.dat lc/*>

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 869 OpC 02 19 00 +57 07.7           ~ 431 0
2 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 414 2
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3037 0
4 CPD-45 2920 Al* 08 43 49.8049446233 -46 07 08.756732813 10.6 11.36 10.99 10.91   O6.5V(n)((f)) 35 1
5 C 0843-458 OpC 08 44.8 -45 58   6.94 6.8     ~ 37 0
6 NGC 3293 OpC 10 35 49 -58 13.8   4.84 4.7     ~ 283 0
7 NGC 4755 OpC 12 53 39 -60 21.7           ~ 268 0
8 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 487 0
9 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 887 0
10 NGC 6811 OpC 19 37 17 +46 23.3   7.47 6.8     ~ 262 0
11 NGC 6819 OpC 19 41 18 +40 11.2   8.21 7.3     ~ 477 0
12 NAME Northern Coalsack DNe 20 21 +37.0           ~ 103 0
13 Ass Cyg OB 9 As* 20 21 +39.9           ~ 121 0
14 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 555 0
15 NGC 6910 36 * 20 23 02.5786477851 +40 46 28.823077358   13.79 13.02     A 8 0
16 NGC 6910 16 bC* 20 23 07.2999583395 +40 46 55.293457953   11.3 10.439     B3 9 0
17 LS III +40 12 bC* 20 23 07.5751317068 +40 46 08.880615447   11.26 10.42     B0.5V 25 0
18 NGC 6910 OpC 20 23 08 +40 46.5   7.13 7.4     ~ 167 0
19 NGC 6910 44 * 20 23 08.0730939828 +40 46 51.847649297     12.5 13.07   ~ 3 0
20 BD+40 4146 * 20 23 10.379 +40 45 51.95   10.8 9.664 9.44   B1 22 0
21 NGC 6910 34 * 20 23 10.6049149500 +40 46 22.108851316   13.59 12.72     ~ 11 0
22 NGC 6910 25 * 20 23 16.1859602814 +40 45 18.986820935   12.21 11.459     B3 8 0
23 NGC 6910 30 * 20 23 16.7880203646 +40 46 00.005347515           ~ 3 0
24 NGC 6910 38 * 20 23 20.2049006852 +40 48 26.685146349   13.80 12.99     ~ 9 0
25 NGC 6910 41 * 20 23 23.8156185928 +40 48 08.518897286   13.87 12.87     ~ 9 0
26 NGC 6910 27 bC* 20 23 33.7531056410 +40 45 19.928089693   12.82 11.77     B1III 14 0
27 * 16 Lac bC* 22 56 23.6292923788 +41 36 13.948197878 4.61 5.436 5.587     B2IV 298 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-21:53:34

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