1999A&A...349..553M


Query : 1999A&A...349..553M

1999A&A...349..553M - Astronomy and Astrophysics, volume 349, 553-572 (1999/9-2)

Galactic B-supergiants: a non-LTE model atmosphere analysis to estimate atmospheric parameters and chemical compositions.

McERLEAN N.D., LENNON D.J. and DUFTON P.L.

Abstract (from CDS):

A non-LTE model atmosphere analysis of moderate resolution (R∼5000) spectra of 46 Galactic B-type supergiants is presented. Standard techniques are adopted, viz. plane-parallel geometry and radiative and hydrostatic equilibrium. Spectroscopic atmospheric parameters (Teff, logg & vturb) and chemical abundances (He, C, N, O, Mg & Si) are estimated, both as a test of the validity of such an approach and in an attempt to provide consistent results for supergiants covering a significant range of spectral types. The values of the estimated atmospheric parameters and their dependence on the physics adopted in the model atmospheres calculations are discussed. The absolute metal abundances are compared to those of main sequence B-type stars and, in general, their chemical compositions appear to be similar. The abundances for He, C, N & O are considered in some detail and are discussed in the context of possible evolutionary histories for this stellar sample. Specifically, it is found that the supergiant sample can be subdivided into a number of evolutionarily distinct groups. The lower mass objects are predominantly chemically near-normal i.e. their photospheres show little or no evidence for chemical processing, whereas the higher mass supergiants have CNO ratios which are indicative of CN and possibly NO-cycle burning. An attempt is made to quantify the difference in nitrogen and carbon abundances between the high and low mass targets but this is hampered by theoretical uncertainties. The possibilities that the most highly processed supergiants may have either larger rotational velocities or have undergone mass transfer within a binary system are discussed.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: early-type - stars: evolution - stars: supergiants

Simbad objects: 48

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Number of rows : 48
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 225094 s*b 00 03 25.7141331 +63 38 25.877987 6.01 6.56 6.22 5.90 5.67 B2.9Iab 144 0
2 * kap Cas s*b 00 32 59.9911963 +62 55 54.417374 3.50 4.30 4.16 4.02 3.96 B1Ia 456 0
3 HD 4841 Em* 00 51 25.9269354192 +63 46 52.209157764 7.13 7.43 6.86 6.28 5.90 B5Ia 83 0
4 HD 7902 Em* 01 19 51.7356954096 +58 12 29.323671624 7.00 7.37 6.96     B6Ib 91 0
5 * 53 Cas * 02 03 00.1876117560 +64 23 24.064866924 5.69 5.930 5.614     A0Ib 109 0
6 * 5 Per s*b 02 11 29.1934233120 +57 38 43.964680956 6.23 6.68 6.35 6.02 5.75 B5Ia 181 0
7 HD 13841 * 02 16 46.3906698552 +57 01 45.670054584 6.95 7.60 7.37 7.11 6.95 B1.5Ib 121 0
8 HD 13854 s*b 02 16 51.7162480872 +57 03 18.882144756 6.10 6.76 6.48 6.14 5.95 B1Iab 209 0
9 HD 13866 Pu* 02 16 57.5756166480 +56 43 07.678553592 6.95 7.63 7.51     B2Ib-II:p 118 1
10 * 61 And s*b 02 19 04.4525174952 +57 08 07.795069656 6.63 7.00 6.5678   6.6876 B3Ia 203 0
11 HD 14143 s*b 02 19 13.9420338600 +57 10 09.234950232 6.71 7.16 6.7000     B2Ia 197 0
12 HD 14322 s*b 02 20 42.9186920184 +55 54 32.680603404 6.87 7.16 6.85 6.44 6.22 B8Iab 91 0
13 HD 14542 s*b 02 23 00.4259329872 +57 23 13.220532924 7.46 7.60 6.9770   6.5893 B9Ia 114 0
14 * 10 Per s*b 02 25 16.0283450208 +56 36 35.354429280 5.95 6.56 6.26 5.93 5.74 B2Ia 235 0
15 HD 14899 * 02 26 18.4722014256 +57 13 41.989770768 7.72 7.83 7.39     A0Ib 60 0
16 HD 14956 s*b 02 26 45.6955268424 +57 40 45.044622588 7.63 7.92 7.20 6.56 6.05 B1.5Ia 142 0
17 HD 15497 s*b 02 31 53.3760247896 +57 41 51.509327532 7.73 7.80 7.02 6.31 5.70 B7Ia 129 0
18 HD 21291 s*b 03 29 04.1328896160 +59 56 25.201164588 4.40 4.63 4.22 3.84 3.46 B9Ia 285 0
19 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 831 0
20 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 647 1
21 HD 31327 * 04 56 20.0879684184 +36 10 06.713559372 6.03 6.426 6.089     B2.5Ib 85 0
22 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 742 0
23 HD 35600 * 05 27 08.2723588272 +30 12 30.969836964 5.56 5.861 5.720     B9Ib 79 0
24 * chi Aur SB* 05 32 43.6731178 +32 11 31.275310 4.68 5.15 4.79 4.42 4.15 B4Ib 206 0
25 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 877 0
26 * kap Ori s*b 05 47 45.3888404 -09 40 10.577707 0.87 1.88 2.06 2.09 2.27 B0.5Ia 556 0
27 * chi02 Ori s*b 06 03 55.1843706432 +20 08 18.428141364 4.24 4.91 4.63 4.32 4.10 B2Ia 438 0
28 * 3 Gem s*b 06 09 43.9852949424 +23 06 48.472220448 5.33 5.96 5.75     B3Ia 223 0
29 Cl Collinder 121 OpC 06 56 20 -24 43.8   3.02 2.6     ~ 145 0
30 * omi02 CMa s*b 07 03 01.4721150 -23 49 59.852308 2.14 2.94 3.02 3.01 3.10 B3Ia 312 0
31 * eta CMa s*b 07 24 05.70228 -29 18 11.1798 1.65 2.37 2.45 2.38 2.44 B5Ia 359 0
32 HD 152003 s*b 16 52 47.3744351712 -41 47 08.990966004 6.90 7.47 7.08 6.72 6.35 O9.7IabNwk 116 1
33 * 67 Oph * 18 00 38.7157893000 +02 55 53.633402904 3.34 3.96 3.93 3.84 3.81 B5I 395 0
34 * 15 Sgr s*b 18 15 12.9063291264 -20 43 41.767600368 4.64 5.42 5.37 5.27 5.19 O9.7Iab 245 0
35 HD 190603 s*b 20 04 36.1742825304 +32 13 06.953333016 5.73 6.19 5.65 5.13 4.71 B1.5Ia 333 0
36 HD 191243 * 20 07 41.4408550416 +34 25 22.464338340 6.09 6.248 6.141     B6Ib 83 0
37 HD 192422 * 20 13 22.4819705328 +38 45 55.513574424 7.13 7.61 7.10 6.62 6.25 B0.5Ib 87 0
38 HD 193183 * 20 17 22.7627493456 +38 14 08.422560204   7.386 7.021     B1.5Ib 69 0
39 HD 194279 s*b 20 23 18.1647782064 +40 45 32.598481500 8.01 8.04 7.01 5.98 5.17 B2Ia 186 0
40 * 55 Cyg s*b 20 48 56.2915921440 +46 06 50.883645024 4.83 5.28 4.86 4.41 4.10 B4Ia 483 0
41 HD 199478 s*b 20 55 49.8039729168 +47 25 03.564093468 5.79 6.12 5.64 5.16 4.78 B8Ia 220 0
42 * 69 Cyg Pu* 21 25 47.0250895464 +36 40 02.584183260 4.89 5.86 5.94     B0Ib 194 0
43 * 9 Cep Pu* 21 37 55.2241394424 +62 04 54.990376788 4.49 5.03 4.73 4.42 4.24 B2Ib 293 0
44 HD 207198 * 21 44 53.2791389640 +62 27 38.048647248 5.61 6.25 5.94 5.66 5.49 O8.5II 332 0
45 * 13 Cep V* 21 54 53.1538880928 +56 36 40.415024952 6.50 6.52 5.80 5.12 4.52 B8Ib 182 0
46 * 19 Cep * 22 05 08.7897533088 +62 16 47.332569936 4.36 5.19 5.11 4.95 4.92 O9Ib 369 0
47 * 26 Cep * 22 27 05.3104700184 +65 07 56.160347196 5.24 5.806 5.515     B0.5Ib 145 0
48 HD 224055 Em* 23 54 42.1155968568 +61 50 20.036841432 7.67 7.846 7.233     B3Ia 89 0

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2022.05.28-22:16:35

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