1997A&A...317..871L

Query : 1997A&A...317..871L

1997A&A...317..871L - Astronomy and Astrophysics, volume 317871-882 (1997/1-3)

Revised spectral types for 64 B-supergiants in the Small Magellanic Cloud: metallicity effects.

LENNON D.J.

Abstract (from CDS):

The problem of the classification of metal poor stars, such as occur in the Small Magellanic Cloud (SMC), is discussed with reference to the applicability of the MK system in such an environment. An alternative method is presented here and applied to B-type supergiants in the SMC. A local reference system is first devised and then a transformation to MK spectral types is determined by comparing the trends of metal line strengths in these two systems. For the determination of the luminosity class, we emphasize the need to use the hydrogen Balmer line strengths independently of metal line-strength considerations. This method is used to determine new spectral types for 64 supergiants in the SMC, 75% of the sample requiring classifications different from previous findings. These new types result in much improved line strength - spectral type correlations for He, C, N, O, Mg and Si. Corresponding changes in the distribution of these stars in the Hertzsprung-Russell diagram of the SMC reveal more clearly than before the existence of a ridge which may be the SMC analogue of a similar feature found for the LMC by Fitzpatrick & Garmany (1990ApJ...363..119F). The group of very luminous supergiants lying above this ridge includes the LBV AV415 (R40), a property which this object has in common with LBVs in the Large Magellanic Cloud. Also, for the first time, clear examples of BN/BC supergiants are found in the SMC.

Abstract Copyright: ∼

Journal keyword(s): stars: fundamental parameters - supergiants - Magellanic Clouds

VizieR on-line data: <Available at CDS (J/A+A/317/871): sptypes.dat>

Simbad objects: 77

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Number of rows : 77
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 LHA 115-S 2 s*b 00 43 11.6459400144 -73 23 10.745670156   12.02 12.0     B8Ia+ 42 0
2 AzV 6 Ev* 00 45 18.198504 -73 15 23.54220   13.436 13.405 13.337   O9III 36 0
3 SK 7 s*b 00 45 46.9602407784 -73 39 54.697500036 11.763 12.614 12.636   11.77 B3Ia 24 0
4 SK 13 s*b 00 47 12.2164410744 -73 06 33.111710784   12.52 12.48     B1.5Ia 83 0
5 BBB SMC 259 s*b 00 47 38.7409708152 -73 07 48.851948496   12.17 12.24     B3Ia 43 0
6 SK 17 s*b 00 47 38.9029190112 -73 22 53.855881572 11.563 12.324 12.236     B3Ia 39 0
7 HD 4862 s*b 00 49 02.9699992181 -73 21 40.929638271   10.968 10.974 11.271   B5Ia 57 0
8 SK 31 s*b 00 49 51.2735728512 -72 55 45.253625124   11.16 11.16     B2Ia 46 0
9 HD 4976 s*b 00 50 06.0800706288 -73 07 45.303645288   11.12 11.00     B8Ia+ 74 0
10 HD 5030 s*b 00 50 31.5814458672 -73 28 42.553178652   11.29 11.18     B9Ia+ 69 0
11 HD 5045 s*b 00 50 38.3868754296 -73 28 18.256667052   11.02 11.04     B1Ia+ 94 0
12 SK 42 s*b 00 51 05.8251762936 -72 00 30.617658252   12.67 12.83 12.79   B1Ia 12 0
13 AzV 97 s*b 00 51 22.8697215480 -73 15 42.352576704 12.31 13.18 13.24   13.22 B2Iab 9 0
14 SK 46 s*b 00 51 23.1472439448 -72 07 20.916492744   12.49 12.59     B1Iab 32 0
15 SK 45 sg* 00 51 24.5968978056 -72 22 58.594918764 9.50 11.4 11.47   11.00 A0Ia 42 0
16 AzV 99 s*b 00 51 25.0162415256 -72 47 55.045916160 12.113 12.964 13.026   13.03 B2.5Ib 9 0
17 SK 47 s*b 00 51 30.3797325768 -73 16 09.891089580   12.20 12.13     B5Ia 25 0
18 AzV 103 * 00 51 36.1513230000 -72 46 04.621875600 12.29 13.254 13.356   13.52 B1II-Ib 13 0
19 AzV 104 s*b 00 51 38.4279675528 -72 48 06.081643404 12.053 13.064 13.226   13.57 B0.5Ia 43 0
20 SK 52 s*b 00 52 27.5837365656 -73 18 56.411383356 11.853 12.624 12.596     B1Ia 23 0
21 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
22 SK 53 s*b 00 52 52.5021619968 -72 44 13.120918440 11.463 12.334 12.406   12.46 B2.5Ia 19 0
23 HD 5291 s*b 00 53 04.8881540232 -72 38 00.139202232 10.26 10.89 10.85     B8Ia 59 0
24 SK 57 s*b 00 53 59.3747012712 -72 45 59.656787964 11.443 12.294 12.316   12.28 B2.5Ia 32 0
25 SK 62 s*b 00 56 11.5319664528 -72 54 37.468399716 11.783 12.694 12.68 12.55 12.75 B2Ia 24 0
26 SK 68 s*b 00 57 31.7301247584 -71 19 59.269190304 11.32 11.96 12.09     B2.5Ia 38 0
27 SK 69 s*b 00 58 07.9057887336 -72 38 30.488438724 11.86 12.21 10.47   11.99 B8Ia 28 0
28 SK 73 s*b 00 58 35.7838206672 -72 16 25.018020660 11.73 12.63 12.66   12.69 B1Iab-Ib 38 0
29 SK 76 s*b 00 58 55.6254525024 -72 32 08.467356804 11.64 12.65 12.75   12.84 BN0Ia 52 0
30 RMC 18 s*b 01 00 06.8830919184 -72 13 57.371461032   11.7 11.5     B1Ia 76 0
31 SK 87 s*b 01 00 30.3317186808 -72 10 57.915198912 12.06 12.95 13.07 12.89 13.10 B2.5Ib 15 0
32 SK 91 s*b 01 00 44.4558783384 -72 23 55.031356248 11.88 12.73 12.79   12.73 B2.5Iab 15 0
33 SK 92 s*b 01 00 51.6940449624 -72 13 34.112418024 12.21 13.13 13.25 13.10 13.56 B1Ib 13 0
34 SK 93 s*b 01 01 06.4905960696 -72 13 00.653347776 12.23 12.79 12.80 12.62 12.78 B9Iab 17 0
35 SK 94 s*b 01 01 07.7622056304 -71 59 58.783358472   12.21 12.36 12.20   B1Ia 39 0
36 SK 96 s*b 01 01 15.7168434720 -72 12 44.013952332 12.19 13.10 13.25   13.32 B2.5Iab 18 0
37 SK 98 sg* 01 01 16.9978346544 -72 17 31.136546040   11.44 11.42     A0Ia 43 0
38 AzV 271 s*b 01 01 20.1530901360 -72 17 18.215966904   13.30 13.46 13.65 13.47 B1.5Iab 19 0
39 RMC 23 s*b 01 02 09.8059581384 -72 00 23.106153852   12.07 12.10     B8Iab-Ia 23 0
40 RMC 25 s*b 01 02 21.4891243296 -72 00 17.596952676 11.753 12.704 12.836   12.69 B1.5Ib 20 0
41 AzV 314 s*b 01 02 48.5007426864 -72 16 45.386577336 11.98 12.82 12.93   13.05 B5Iab 14 0
42 CPD-72 77 sg* 01 02 49.6101049512 -72 10 14.479892112 10.54 10.98 10.90   10.88 A0Ia 51 0
43 Dachs SMC 2-5 s*b 01 02 57.6114886104 -72 01 04.719351000 11.953 12.864 13.016   13.62 B3Iab 11 0
44 RMC 32 s*b 01 03 43.5781263456 -72 03 56.301914736 11.793 12.644 12.716   12.81 B2Iab 16 0
45 RMC 33 s*b 01 03 49.4514619776 -72 07 29.685468036   12.645 12.645 12.921   B1Ia 21 0
46 RMC 35 s*b 01 03 56.0932813464 -72 02 47.746694580 11.733 12.504 12.576   13.09 B2.5Ib 19 0
47 RMC 36 s*b 01 04 49.3494336384 -72 06 21.746153556 10.57 11.34 11.36     B3Ia 58 0
48 RMC 37 s*b 01 04 52.9090700064 -72 08 36.784118328 10.75 11.30 11.23     B9Ia 45 0
49 SK 119 s*b 01 04 58.0658804448 -72 39 59.515048656 11.57 10.12 12.34   12.23 B2Ia 34 0
50 AzV 374 * 01 05 01.8635159352 -72 26 53.789152056 12.04 12.96 13.10   13.224 B2Ib 17 0
51 SK 121 s*b 01 05 27.4776868728 -72 48 15.103596384   11.5 11.4     B8Ia 33 0
52 SK 128 s*b 01 06 29.2604555136 -72 22 08.607372996   11.7 11.8     B2.5Ia 32 0
53 HD 6884 s*b 01 07 18.2182685856 -72 28 03.657105156   10.32 10.2     B9Ia0ek 134 0
54 SK 131 s*b 01 07 32.6015725776 -72 17 38.750615340 11.903 12.974 13.146     B0.7II 24 0
55 HD 7099 s*b 01 09 03.9542485824 -72 32 17.627859960   10.89 10.9     B2.5Ia 72 0
56 SK 138 s*b 01 09 15.8151632688 -72 25 14.126030148 11.90 12.68 12.78   12.78 B5Iab 20 0
57 SK 145 s*b 01 11 25.9167352608 -72 31 21.276515892 11.463 12.464 12.596   11.60 B2.5Ia 42 0
58 SK 150 s*b 01 13 01.8742585512 -72 45 48.441989592 11.593 12.564 12.676   11.42 B1.5Ia 41 0
59 SK 155 s*b 01 14 50.2614192144 -73 20 17.851206156 11.35 12.33 12.48     O9Iab(ff) 63 0
60 SK 158 s*b 01 15 53.3588035416 -73 19 08.520075336 11.58 12.53 12.70 12.68   B0.2Ib 31 0
61 SK 160 HXB 01 17 05.1457288392 -73 26 36.014808156 12.23 13.00 13.15   13.17 O9.7Ia+ 918 0
62 SK 168 s*b 01 21 48.2562501672 -72 45 59.237665992   11.7 11.7     B9Ia 34 0
63 WDG 1 s*b 01 41 42.0683863272 -73 50 38.183979624   11.86 11.84     B1.5Ia 74 0
64 WDG 4 s*b 01 49 12.5718229824 -74 00 37.087973496   12.04 12.11     B6Ia 30 0
65 WDG 6 s*b 01 53 10.1738192160 -73 55 06.725566200   12.23 12.29 12.53   B5Iab 22 0
66 HD 13854 s*b 02 16 51.7162480872 +57 03 18.882144756 6.10 6.76 6.48 6.14 5.95 B1Iab 217 0
67 HD 14956 s*b 02 26 45.6955268424 +57 40 45.044622588 7.63 7.92 7.20 6.56 6.05 B1.5Ia 154 0
68 HD 21291 s*b 03 29 04.1328896160 +59 56 25.201164588 4.40 4.63 4.22 3.84 3.46 B9Ia 298 0
69 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Ia 786 0
70 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
71 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 921 0
72 * kap Ori s*b 05 47 45.3888404 -09 40 10.577707 0.87 1.88 2.06 2.09 2.27 B0.5Ia 588 0
73 * chi02 Ori s*b 06 03 55.1843706432 +20 08 18.428141364 4.24 4.91 4.63 4.32 4.10 B2Ia 465 0
74 * omi02 CMa s*b 07 03 01.4713413613 -23 49 59.858307121 2.14 2.94 3.02 3.01 3.10 B3Ia 336 0
75 * eta CMa s*b 07 24 05.70228 -29 18 11.1798 1.65 2.37 2.45 2.38 2.44 B5Ia 379 0
76 HD 157038 s*b 17 22 39.2179927464 -37 48 16.699933296 6.99 7.20 6.44 5.70 5.15 B3Iap 115 0
77 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0

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