2011ApJ...736..140C


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST14:07:47

2011ApJ...736..140C - Astrophys. J., 736, 140 (2011/August-1)

A systematic search for corotating interaction regions in apparently single galactic Wolf-Rayet stars. II. A global view of the wind variability.

CHENE A.-N. and ST-LOUIS N.

Abstract (from CDS):

This study is the second part of a survey searching for large-scale spectroscopic variability in apparently single Wolf-Rayet (WR) stars. In a previous paper (Paper I), we described and characterized the spectroscopic variability level of 25 WR stars observable from the northern hemisphere and found 3 new candidates presenting large-scale wind variability, potentially originating from large-scale structures named corotating interaction regions (CIRs). In this second paper, we discuss an additional 39 stars observable from the southern hemisphere. For each star in our sample, we obtained 4-5 high-resolution spectra with a signal-to-noise ratio of ∼100 and determined its variability level using the approach described in Paper I. In total, 10 new stars are found to show large-scale spectral variability of which 7 present CIR-type changes (WR 8, WR 44, WR55, WR 58, WR 61, WR 63, WR 100). Of the remaining stars, 20 were found to show small-amplitude changes and 9 were found to show no spectral variability as far as can be concluded from the data on hand. Also, we discuss the spectroscopic variability level of all single galactic WR stars that are brighter than v ∼ 12.5, and some WR stars with 12.5 < v ≤ 13.5, i.e., all the stars presented in our two papers and four more stars for which spectra have already been published in the literature. We find that 23/68 stars (33.8%) present large-scale variability, but only 12/54 stars (∼22.1%) are potentially of CIR type. Also, we find that 31/68 stars (45.6%) only show small-scale variability, most likely due to clumping in the wind. Finally, no spectral variability is detected based on the data on hand for 14/68 (20.6%) stars. Interestingly, the variability with the highest amplitude also has the widest mean velocity dispersion.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: winds, outflows - stars: Wolf-Rayet

Simbad objects: 60

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Number of rows : 60

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 4004 WR* 00 43 28.3971235391 +64 45 35.383738645 10.28 10.718 10.138     WN4-s 186 0
2 HD 6327 WR* 01 05 23.0143603 +60 25 18.965197   11.49 11.33     WN2-w 114 0
3 HD 16523 WR* 02 41 11.6752293070 +56 43 49.735743590 10.03 10.34 9.99     WC6 127 0
4 HD 17638 WR* 02 52 11.6616623898 +56 56 07.129636750 10.99 10.86 10.41     WC6 113 0
5 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 749 0
6 HD 56925 WR* 07 18 29.1313276537 -13 13 01.513156589 11.21 11.74 11.56 11.40   WN4b 162 0
7 V* V358 CMa WR* 07 20 22.3648862820 -23 43 56.522209754   15.04 14.11 13.87   WN4//WC 14 0
8 HD 62910 WR* 07 44 58.2216344436 -31 54 29.553631132 10.08 10.44 10.10 10.17   WN6/WC4 119 0
9 HD 65865 WR* 07 59 46.2452165709 -28 44 03.084742445 10.62 11.20 10.90 11.16   WN5h 101 0
10 CD-45 4482 WR* 08 44 47.2902196838 -45 58 55.414166402 10.95 11.29 10.74 10.58   WN8h+? 100 0
11 HD 76536 WR* 08 54 59.1670924993 -47 35 32.662255423 9.04 9.13 8.80 9.52   WC 116 0
12 HD 79573 WR* 09 13 11.7691173632 -50 06 25.521002105 12.30 11.80 10.69 10.52   WC6 75 0
13 HD 88500 WR* 10 10 31.9111494342 -60 38 42.417239257   10.84 10.65 10.67   WC5 79 0
14 HD 89358 WR* 10 17 02.2741836044 -57 54 46.871795579 11.1 11.19 10.83 10.59   WN4-s 164 1
15 WR 21a WR* 10 25 56.5023591737 -57 48 43.517827393     12.67     O2If*/WN5 82 0
16 HD 92809 WR* 10 41 38.3243559450 -58 46 18.721755258 8.95 9.28 9.03 9.60   WC6 144 0
17 HD 93131 WR* 10 43 52.2575981063 -60 07 04.016913264 5.52 6.43 6.48 7.46   WN6ha-w 281 0
18 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 343 1
19 WR 28 WR* 10 48 58.7235338702 -59 03 37.303699221   13.70 12.98     WN6(h)-w 30 0
20 HD 95435 WR* 11 00 00.7206077473 -57 48 59.273968690   11.78 11.61 11.67   WC6 55 0
21 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 395 0
22 MR 39 WR* 11 16 57.8367853584 -59 26 23.891767387   13.04 12.79 12.71   WN4-w 50 0
23 HD 104994 WR* 12 05 18.7203813373 -62 03 10.139083749 9.95 10.94 10.93 11.03   WN3p-w 158 0
24 CPD-61 3569 WR* 13 18 01.0418998739 -62 26 04.755158118 12.66 12.64 11.88 11.84   WC7+OB 60 0
25 HD 115473 WR* 13 18 27.9938060343 -58 08 13.603603690 9.09 9.68 9.00 9.72   WC5 107 0
26 HD 117297 WR* 13 30 53.2511996037 -62 04 51.856386987 10.81 11.10 10.90 10.70   WC8 92 0
27 MR 48 WR* 13 32 43.7631500403 -65 01 27.835643271 12.85 13.20 12.73 12.61   WN5-w 53 0
28 HD 117688 WR* 13 33 30.1195029290 -62 19 01.211515819 8.69 10.81 10.90 10.44   WN7 122 0
29 HD 119078 WR* 13 43 16.3585170935 -67 24 04.971391283 9.11 9.737 9.40 10.08   WC7/8 99 0
30 MR 51 WR* 13 49 04.4894389061 -65 41 56.120790651 12.75 12.95 12.71 12.89   WN5 58 0
31 HD 121194 WR* 13 55 48.4480921364 -61 09 48.458279758 14.34 13.65 12.20 12.12 10.31 WC8 38 0
32 MR 53 WR* 14 13 03.5249088603 -65 26 52.708243005 11.93 12.51 12.32 12.21   WN5-w 69 0
33 WRAY 15-1254 WR* 14 50 58.2650618251 -59 51 26.428849251 14.29 13.96 12.47 11.85   WN6 42 0
34 MR 55 WR* 15 15 32.6263216950 -59 02 30.692489276 12.46 12.56 11.84 11.63   WN6-w 67 0
35 HD 143414 WR* 16 03 49.3451223381 -62 41 35.942835918 9.32 10.03 10.10     WN6-w 106 0
36 HD 147419 WR* 16 24 26.2278740665 -51 32 06.062121260   11.46 10.50 10.74   WN6-s 106 0
37 MR 62 WR* 16 41 19.2542723021 -48 01 59.104083110 14.13 13.53 12.58 13.03   WC8+OB 43 0
38 HD 151932 WR* 16 52 19.2478420644 -41 51 16.269632432 6.06 6.79 6.51 7.64   WN7h 298 0
39 HD 152408 s*b 16 54 58.5049001684 -41 09 03.091715510 5.17 5.92 5.77 7.00   O8Iape 355 0
40 HD 152386 s*b 16 55 06.4500962204 -44 59 21.325469696 8.15 8.64 8.13 8.84   O6:Iafpe 77 0
41 MR 66 WR* 17 02 40.3825863866 -45 59 15.455194984   13.62 12.07 11.77   WC9 60 0
42 WRAY 15-1600 WR* 17 04 04.6347450070 -45 12 15.059699813 12.95 13.00 11.55 11.85   WN7(h) 44 0
43 MR 67 WR* 17 10 54.6275136033 -46 36 00.577179537   13.15 12.50 12.28   WN6 38 0
44 LS 3982 WR* 17 14 27.1191115555 -39 45 47.053559348 10.63 10.95 10.41     WN6h-w 65 0
45 CPD-33 4347 WR* 17 18 49.7246525731 -33 57 41.389875461   13.93 12.56 12.21   WN8/WC9 63 0
46 WRAY 15-1666 WR* 17 18 52.8750745581 -38 50 03.606959080 13.93 13.27 11.83 11.43   WN7 68 0
47 HD 156385 WR* 17 19 29.9012727857 -45 38 23.874796927 6.55 6.97 6.92 8.11   WC7 158 0
48 HD 157451 WR* 17 25 23.2779746024 -43 29 31.469615959 10 10.59 10.20 10.46   WC9 84 0
49 HD 158860 WR* 17 33 07.0669567120 -33 38 23.500757398   12.20 10.69 10.38   WN5-w 49 0
50 HD 318139 WR* 17 42 09.7605770496 -32 33 24.800534509   13.93 12.78 12.20   WN7 44 0
51 HD 164270 WR* 18 01 43.1452971756 -32 42 55.161881733 8.52 8.97 8.74 9.51   WC9d+? 217 0
52 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 147 0
53 HD 165763 WR* 18 08 28.4691215895 -21 15 11.182287576 7.16 7.54 7.82 8.55   WC6 272 0
54 MR 87 WR* 18 25 30.0233828772 -14 38 41.034349989 13.38 13.09 11.86 11.33   WN6-w 75 0
55 MR 89 WR* 18 41 00.8669826586 -04 26 14.473452479 13.1 12.97 11.93 11.67   WN7 67 2
56 MR 97 WR* 20 00 19.1224209318 +33 15 51.098849239 12.93 13.050 12.080     WN7h 73 0
57 HD 191765 WR* 20 10 14.1929815789 +36 10 35.069005168 7.64 8.08 8.08     WN6-s 428 0
58 HD 192103 WR* 20 11 53.5274946554 +36 11 50.523501826 7.77 8.13 8.11     WC8+OB: 325 0
59 HD 193077 WR* 20 17 00.0264117871 +37 25 23.780238760 7.82 8.32 8.01 8.71   WN5-w+B? 280 0
60 HD 213049 WR* 22 27 17.8189297929 +56 15 11.768608852   11.71 10.99     WC6 83 0

    Equat.    Gal    SGal    Ecl

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2021.04.14-14:07:47

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