2008A&A...480..179D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET12:46:02

2008A&A...480..179D - Astronomy and Astrophysics, volume 480, 179-186 (2008/3-2)

Pulsating B and Be stars in the Small Magellanic Cloud.

DIAGO P.D., GUTIERREZ-SOTO J., FABREGAT J. and MARTAYAN C.

Abstract (from CDS):

Stellar pulsations in main-sequence B-type stars are driven by the κ-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities. As the metallicity of the SMC is lower than Z=0.005, it constitutes a very suitable object to test these predictions. The main objective is to investigate the existence of B-type pulsators at low metallicities, searching for short-term periodic variability in absorption-line B and Be stars in the SMC. The analysis has been performed in a sample of 313 B and Be stars with fundamental astrophysical parameters accurately determined from high-resolution spectroscopy. Photometric light curves of the MACHO project have been analyzed using standard Fourier techniques and linear and non-linear least squares fitting methods. The position of the pulsating stars in the HR diagram has been used to ascertain their nature and to map the instability regions in the SMC. We have detected 9 absorption-line B stars showing short-period variability, two among them being multiperiodic. One star is most likely a β Cephei variable and the remaining 8 are SPB stars. The SPB instability strip in the SMC is shifted towards higher temperatures than the Galaxy. In the Be star sample, 32 stars are short-period variables, 20 among them multiperiodic. 4.9% of B stars and 25.3% of Be stars are pulsating stars. β Cephei and SPB stars do exist at the SMC metallicity. The fractions of SPB stars and pulsating Be stars in the SMC are lower than in the Galaxy. The fraction of pulsating Be stars in the SMC is much higher than the fraction of pulsating absorption-line B stars, as in the Galaxy.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: oscillations - stars: early-type - stars: statistics - galaxies: Magellanic Clouds

Simbad objects: 44

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Number of rows : 44

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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9139 1
2 [MA93] 644 Be* 00 53 04.51 -72 20 49.5 14.77 15.75 15.83   15.72 B2III 4 0
3 MACHO 207.16147.27 * 00 53 06.0673024166 -72 19 38.752464999 14.63 15.46 15.60   15.72 B2IV 3 0
4 [MA93] 650 Be* 00 53 10.35 -72 20 42.4 14.83 15.75 15.84   15.73 B2III 4 0
5 MACHO 207.16147.14 Be* 00 53 12.66 -72 20 29.5 14.35 15.14 15.23   15.37 B2III 4 0
6 MACHO 207.16203.94 * 00 53 17.600 -72 24 28.60   16.20 16.380     B2IV 3 0
7 2MASS J00533149-7217154 * 00 53 31.50 -72 17 15.5 15.49 16.32 16.46   16.60 B2V 3 0
8 [MA93] 720 Be* 00 53 53.600 -72 22 01.60 14.85 15.55 15.55   15.49 B3III 4 0
9 MACHO 207.16205.141 Be* 00 54 07.970 -72 14 03.90   17.43 17.520     B2V 3 0
10 LIN 252 Be* 00 54 18.0926930581 -72 27 37.224575787 14.41 15.49 15.54   15.27 B0III 6 0
11 MACHO 207.16259.35 Be* 00 54 22.3308976375 -72 27 07.701230776 14.45 15.45 15.47   15.39 B2III 3 0
12 MACHO 207.16262.58 Be* 00 54 24.2357140869 -72 13 49.582366928 15.79 16.54 16.66   16.72 B2IV 3 0
13 MACHO 207.16262.86 Be* 00 54 27.1018870186 -72 15 16.053742715 16.48 16.71 16.93   17.09 B2III 3 0
14 [MA93] 772 Be* 00 54 32.9131683191 -72 27 41.870035723 14.41 15.37 15.37   15.30 B2III 8 0
15 [MA93] 785 Be* 00 54 40.79 -72 27 52.5 15.09 15.92 16.00   15.87 B2III 7 0
16 [MA93] 813 Be* 00 54 59.3132087980 -72 27 02.213919518 14.54 15.59 15.65   15.49 B2III 4 0
17 LIN 276 Be* 00 55 13.591 -72 29 14.05 14.37 15.39 15.37   15.21 B2III 9 0
18 [MA93] 843 Be* 00 55 25.31 -72 29 56.8 15.24 16.16 16.18   16.20 B2IV 5 0
19 OGLE SMC719.19.030187 El* 00 55 29.9195931755 -72 19 10.371989903 14.80 15.56 16.26   15.79 B2IV 4 0
20 [MA93] 853 Be* 00 55 30.7808435290 -72 25 20.479761509 14.44 15.53 15.49   15.39 B2III 11 0
21 [MA93] 854 Be* 00 55 30.9194336388 -72 29 36.884072684 14.75 15.78 15.76   15.65 B2IV 4 0
22 2MASS J00553526-7215120 Be* 00 55 35.26 -72 15 12.0 15.84 16.68 16.68   16.41 B2IV 3 0
23 MACHO 207.16316.99 Be* 00 55 38.181 -72 27 55.09 16.06 17.09 17.17   16.90 B1IV 5 0
24 [MA93] 872 Be* 00 55 44.4723363290 -72 20 38.327101994 15.11 16.20 16.18   16.05 B3IV 5 0
25 MACHO 207.16318.77 * 00 55 51.7169513284 -72 19 10.941704657 15.95 16.88 16.84   16.90 B1V 3 0
26 MACHO 207.16372.22 Be* 00 56 05.58 -72 31 25.9 14.43 15.47 15.49   15.45 B2III 4 0
27 LIN 298 Em* 00 56 07.1885090704 -72 28 13.823802603 12.85 13.44 13.43   13.230 A1I 16 0
28 OGLE SMC-SC7 206160 Be* 00 56 07.5114522993 -72 27 43.860100242 15.79 16.65 16.69   16.50 B2III-IV 9 0
29 [MA93] 917 Be* 00 56 12.2581264900 -72 19 53.319313208 15.15 16.27 16.16 16.25 15.88 B5II-III 6 0
30 LIN 303 Be* 00 56 14.902 -72 28 47.79 14.41 15.28 15.35   15.29 B3II-III 17 0
31 [MA93] 928 Be* 00 56 17.88 -72 15 05.9 15.18 16.06 16.13   16.12 B2III-IV 6 0
32 OGLE SMC-SC7 205947 Be* 00 56 18.13 -72 27 13.4 14.58 15.45 15.51   15.49 B2IV 14 0
33 [MA93] 929 Be* 00 56 18.26 -72 17 46.8 15.18 16.26 16.16   15.91 B3III 5 0
34 MACHO 207.16374.240 Be* 00 56 20.110 -72 21 19.30   17.67 17.910     B2V 3 0
35 MACHO 207.16376.188 * 00 56 22.30 -72 16 05.8 16.74 17.66 17.81   18.02 B2V 3 0
36 Cl* NGC 330 ROB B41 Be* 00 56 26.60 -72 28 09.2 14.62 15.45 15.66   15.50 B2III 12 0
37 MACHO 207.16373.129 Be* 00 56 29.097 -72 25 21.58 15.72 16.72 16.64   16.57 B2IV 6 0
38 OGLE SMC719.18.027555 El* 00 56 29.6414130928 -72 19 52.704436742 15.23 16.09 16.16 16.47 16.32 B2IV 5 0
39 Cl* NGC 330 ROB B5 Be* 00 56 31.1605212317 -72 27 58.056392097 14.53 15.36 15.45   15.34 B3III 20 0
40 2MASS J00563447-7216588 * 00 56 34.47 -72 16 58.8 18.00 18.77 18.67   18.81 B2IV 3 0
41 MACHO 207.16376.31 * 00 56 49.7268297066 -72 15 29.768605564 14.54 15.48 15.67   15.85 B2IV 3 0
42 MACHO 207.16431.1732 Be* 00 57 30.58 -72 23 33.2 14.82 15.56 15.64   15.62 B2IV 3 0
43 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5405 1
44 NAME Galactic Bulge reg ~ ~           ~ 3263 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-12:46:02

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