2014A&A...563A..89S


Query : 2014A&A...563A..89S

2014A&A...563A..89S - Astronomy and Astrophysics, volume 563A, 89-89 (2014/3-1)

The Wolf-Rayet stars in M 31. I. Analysis of the late-type WN stars.

SANDER A., TODT H., HAINICH R. and HAMANN W.-R.

Abstract (from CDS):

Comprehensive studies of Wolf-Rayet stars were performed in the past for the Galactic and the LMC population. The results revealed significant differences, but also unexpected similarities between the WR populations of these different galaxies. Analyzing the WR stars in M31 will extend our understanding of these objects in different galactic environments. The present study aims at the late-type WN stars in M31. The stellar and wind parameters will tell about the formation of WR stars in other galaxies with different metallicity and star formation histories. The obtained parameters will provide constraints to the evolution of massive stars in the environment of M31.We used the latest version of the Potsdam Wolf-Rayet model atmosphere code to analyze the stars via fitting optical spectra and photometric data. To account for the relatively low temperatures of the late WN10 and WN11 subtypes, our WN models have been extended into this temperature regime.Stellar and atmospheric parameters are derived for all known late-type WN stars in M31 with available spectra. All of these stars still have hydrogen in their outer envelopes, some of them up to 50% by mass. The stars are located on the cool side of the zero age main sequence in the Hertzsprung-Russell diagram, while their luminosities range from 105 to 106L. It is remarkable that no star exceeds 106L.If formed via single-star evolution, the late-type WN stars in M31 stem from an initial mass range between 20 and 60M. From the very late-type WN9-11 stars, only one star is located in the S Doradus instability strip. We do not find any late-type WN stars with the high luminosities known in the Milky Way.

Abstract Copyright:

Journal keyword(s): stars: massive - stars: evolution - stars: mass-loss - stars: Wolf-Rayet - stars: atmospheres - stars: winds, outflows

CDS comments: Fig.10 Peony star is WR 102ka in SIMBAD.

Simbad objects: 46

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Number of rows : 46
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 LGGS J003857.19+403132.2 WR* 00 38 57.19 +40 31 32.2 19.93 21.16 20.85   19.87 WN7:+neb 5 0
2 MLA 95 WR* 00 39 11.0327397144 +40 38 17.282816592 19.934 20.235 20.587 20.379 20.610 WC6 5 0
3 LGGS J004024.33+405016.2 WR* 00 40 24.2976168432 +40 50 16.198797012           WN9 2 0
4 LGGS J004036.76+410104.3 WR* 00 40 36.7642333200 +41 01 04.161570348           WN8 2 0
5 MAC OB 69-2 WR* 00 40 56.4754149384 +41 03 08.579946636 17.010 18.003 18.130 18.004 17.888 WN9 10 0
6 LGGS J004126.11+411220.0 WR* 00 41 26.11 +41 12 20.0           WN7 2 0
7 LGGS J004126.39+411203.5 WR* 00 41 26.39 +41 12 03.5           WN8 2 0
8 LGGS J004130.37+410500.9 WR* 00 41 30.37 +41 05 00.9 17.53 18.55 18.50 18.12 18.17 WNL/Of+neb 3 0
9 LGGS J004238.90+410002.0 WR* 00 42 38.9012601984 +41 00 01.887708060           WN7 2 0
10 [WB92a] 46 WR* 00 42 42.3062970840 +41 39 22.620682188 17.85 18.7 18.6 18.2 18.1 WN10 6 0
11 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11890 1
12 LGGS J004302.05+413746.7 WR* 00 43 02.05 +41 37 46.7           WN9 2 0
13 LGGS J004334.50+410951.7 WR* 00 43 34.4985868320 +41 09 51.584564772 17.3 18.2 18.1 17.8 17.7 WN9/Ofpe 3 0
14 [VRJ2006] M31V-J00433706+4142370 WR* 00 43 37.0743730248 +41 42 36.961468776           WN10 3 0
15 LGGS J004344.48+411142.0 WR* 00 43 44.4829693824 +41 11 41.898896124           WN8+neb 2 0
16 [VRJ2006] M31V-J00435331+4146387 WR* 00 43 53.34 +41 46 38.9           WN7 3 0
17 LGGS J004357.31+414846.2 WR* 00 43 57.2749781808 +41 48 46.098112284           WN8 2 0
18 LGGS J004413.06+411920.5 WR* 00 44 13.06 +41 19 20.5           WN8 2 0
19 LGGS J004430.04+415237.1 WR* 00 44 30.04 +41 52 37.1           WN8 2 0
20 LGGS J004511.21+420521.7 WR* 00 45 11.1955764672 +42 05 21.594753276           WN11 2 0
21 [VRJ2006] M31V-J00454228+4145098 WR* 00 45 42.2440001736 +41 45 09.974616696           WN10 3 0
22 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5526 1
23 NAME Romano Star WR* 01 35 09.7011882336 +30 41 57.160957560   16.5 18.04     Ofpe/WN9 50 1
24 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6373 1
25 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 A5Iaeq 364 0
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
27 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1872 1
28 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 320 0
29 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2335 0
30 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 613 0
31 MR 35 s*b 11 08 40.0634208096 -60 42 51.721320060   12.33 10.20 11.66   LBV 124 0
32 Cl* Westerlund 1 W 243 s*b 16 47 07.5040736160 -45 52 29.123491188   19.873 15.730     LBV 56 0
33 HD 326823 WR* 17 06 53.9045282184 -42 36 39.704037840 9.68 9.87 9.03 9.51   WNpec 76 1
34 HD 160529 sg* 17 41 59.0261939376 -33 30 13.704456780 8.17 7.87 6.66 5.50 4.51 A2Ia 192 1
35 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
36 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 57 0
37 [GMC99] D6 s*b 17 46 17.982 -28 49 03.46           LBV 60 0
38 WR 102ka WR* 17 46 18.12 -29 01 36.6           WN10 30 0
39 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Iaep 182 1
40 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 268 2
41 V* V481 Sct s*b 18 33 55.2781965336 -06 58 38.631350604           LBV_B[e]: 48 0
42 BD-13 5061 sg* 18 39 26.1022628664 -13 50 47.159703852 10.86 10.75 9.89 9.98   B9Ia 37 1
43 IRAS 18576+0341 s*b 19 00 10.89456 +03 45 47.1096           B8I 84 1
44 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1154 1
45 IRAS 20298+4011 Em* 20 31 42.2846664600 +40 21 59.074415640     15.1     B:I[e] 90 0
46 NAME Local Group GrG ~ ~           ~ 7723 0

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2022.08.15-15:17:45

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