2007A&A...472..577M

Query : 2007A&A...472..577M

2007A&A...472..577M - Astronomy and Astrophysics, volume 472577-586 (2007/9-3)

Be stars and binaries in the field of the SMC open cluster NGC 330 with VLT-FLAMES.

MARTAYAN C., FLOQUET M., HUBERT A.M., GUTIERREZ-SOTO J., FABREGAT J., NEINER C. and MEKKAS M.

Abstract (from CDS):

Observations of hot stars belonging to the young cluster SMC-NGC 330 and its surrounding region were obtained with the VLT-GIRAFFE facilities in MEDUSA mode. We investigated the B and Be star properties and proportions in this environment of low metallicity. We also searched for rapid variability in Be stars using photometric databases. Using spectroscopic measurements, we characterized the emission and properties of Be stars. By cross-correlation with photometric databases such as MACHO and OGLE, we searched for binaries in our sample of hot stars, as well as for short-term variability in Be stars. We report on the global characteristics of the Be star sample (131 objects). We find that the proportion of early Be stars with a large equivalent width of the Hα emission line is higher in the SMC than in the LMC and MW. We find a slight increase in the proportion of Be stars compared to B-type stars with decreasing metallicity. We also discovered spectroscopic and photometric binaries, and for the latter we give their orbital period. We identify 13 Be stars with short-term variability. We determine their period(s) and find that 9 Be stars are multiperiodic.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/472/577): table1.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

CDS comments: Table 1: Objects MHF[S9] 47315 and 51066 are resp. objects MHF[S61] 47315 and 51066 of Martrayan et al. (2007A&A...462..683M). They are 2MASS J00544955-7224222 and 2MASS J00545093-7222347 resp. in SIMBAD.

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 UCAC4 089-002008 Be* 00 53 12.6362499792 -72 20 29.685915312 14.35 15.14 15.23 15.121 15.37 B3IIe 8 0
3 NGC 299 Cl* 00 53 24.74 -72 11 47.6 11.71 12.05 11.73   10.67 ~ 41 0
4 MACHO 207.16203.202 Be* 00 53 26.6790300792 -72 22 07.555826316 16.68 17.49 17.54   17.39 B1V 3 0
5 [H86] 145 Cl* 00 53 37 -72 21.0           ~ 10 0
6 OGLE SMC101.4 29500 EB* 00 53 54.7223021448 -72 18 29.907169272     16.2 16.41 16.323 ~ 6 0
7 OGLE SMC108.7 211 EB* 00 54 06.5065696200 -72 14 47.473336644     16.7   16.638 ~ 5 0
8 NGC 306 Cl* 00 54 14.31 -72 14 27.3 12.08 12.23 12.07   11.40 ~ 33 0
9 [MA93] 772 Be* 00 54 32.9134382592 -72 27 41.868021024 14.41 15.37 15.37   15.30 B2III 8 0
10 Bruck 79 Cl* 00 54 48.50 -72 27 53.6 12.76 12.99 12.85   12.55 ~ 23 0
11 OGLE SMC105.5 31420 EB* 00 54 53.3013972571 -72 28 12.402044060   17.30 17.5 17.65 17.48 ~ 8 0
12 OGLE SMC108.7 7673 EB* 00 55 09.15 -72 17 13.9     17.3 17.42 17.199 ~ 5 0
13 LIN 276 Be* 00 55 13.5831112680 -72 29 13.847173764 14.37 15.39 15.37   15.21 B2III 9 0
14 [MA93] 853 Be* 00 55 30.7813001136 -72 25 20.478738792 14.44 15.53 15.49   15.39 B2III 12 0
15 SV* HV 1659 EB* 00 55 40.3301329776 -72 17 51.105930360 15.41 16.19 16.23 16.44 16.39 B3III 8 0
16 SV* HV 11348 Be* 00 55 49.6209563424 -72 25 27.447185820 14.06 14.76 14.56   14.47 B3II/III 11 0
17 MACHO 207.16319.70 SB* 00 55 57.86 -72 16 37.1     17.1     ~ 1 0
18 [BS95] 78 As* 00 56 04 -72 20.2           ~ 5 0
19 [MA93] 903 Be* 00 56 05.5626794136 -72 31 26.194952100 14.43 15.47 15.49 15.868 15.45 B2III 6 0
20 [MA93] 906 Ae* 00 56 06.4513637040 -72 28 27.893294436   17.63 17.13   16.330 B[e] 20 0
21 SMC ASS 39 As* 00 56 07 -72 18.3           ~ 7 0
22 Cl* NGC 330 ARP 2 EB* 00 56 09.4223722008 -72 28 09.469886916 15.07 15.23 14.28   13.13 K:II 30 0
23 MOA J005611.6-721824 EB* 00 56 11.6020060296 -72 18 24.176800116     14.7 14.92 15.261 ~ 9 0
24 MACHO 207.16373.5496 Be* 00 56 15.9669288456 -72 25 16.112986824 15.95 16.76 16.77   16.86 B2IV 5 0
25 OGLE SMC-SC7 205947 Be* 00 56 18.1441803648 -72 27 13.655282940 14.58 15.45 15.51   15.49 B2IV 15 0
26 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
27 SV* HV 12132 EB* 00 56 19.2723233304 -72 21 03.904991028     16.6   16.277 ~ 8 0
28 [H86] 170 Cl* 00 56 20 -72 21.2           ~ 8 0
29 Cl* NGC 330 ELS 30 EB* 00 56 23.5875207024 -72 21 23.934684204 13.60 14.82 14.82 15.17 15.10 B0.5V 13 0
30 Cl* NGC 330 KWBBE 837 Be* 00 56 29.1128508434 -72 25 21.635924913 15.72 16.72 16.64   16.57 B2IV 6 0
31 Cl* NGC 330 ROB B5 Be* 00 56 31.1608391376 -72 27 58.053588156 14.53 15.36 15.45   15.34 B3III 21 0
32 OGLE SMC108.7 22350 EB* 00 56 34.2625062960 -72 17 37.500517356     15.9   16.039 ~ 5 0
33 MACHO 207.16376.67 SB* 00 56 50.579 -72 16 50.85     16.7     ~ 1 0
34 OGLE SMC719.18.027621 El* 00 56 51.1339693008 -72 17 38.017305528     15.9 16.01 15.872 ~ 5 0
35 LHA 115-S 26 Cl* 00 57 30.00 -72 15 53.0 11.29       11.34 ~ 42 1
36 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
37 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
38 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
39 V* HZ CMa Be* 06 50 23.3482557912 -31 42 21.808309320   5.829 5.747     B6IVe+A 96 0
40 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 269 0
41 * bet Lyr SB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 955 0
42 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 756 0

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