2015MNRAS.449.1834W

Query : 2015MNRAS.449.1834W

2015MNRAS.449.1834W - Mon. Not. R. Astron. Soc., 449, 1834-1844 (2015/May-2)

The spectra of WC9 stars: evolution and dust formation.

WILLIAMS P.M., CROWTHER P.A. and VAN DER HUCHT K.A.

Abstract (from CDS):

We present analyses of new optical spectra of three WC9 stars, WR 88, WR 92 and WR 103 to test the suggestion that they exemplify an evolutionary sequence amongst the WC9 stars. The spectrum of WR 88 shows conspicuous lines of N iii and N iv, leading to classification as a transitional WN8o/WC9 star. The three stars show a sequence of increasing O ii and O iii line strengths, confirming and extending earlier studies. The spectra were analysed using cmfgen models, finding greater abundances of oxygen and carbon in WR 103 than in WR 92 and, especially, in WR 88. Of the three stars, only WR 103 makes circumstellar dust. We suggest that oxygen itself does not enhance this process but that it is its higher carbon abundance that allows WR 103 to make dust.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): stars: abundances - stars: individual: WR 88 - stars: individual: WR 92 - stars: individual: WR 103 - stars: Wolf-Rayet

CDS comments: HD 157541 is a misprint for HD 157451.

Simbad objects: 39

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Number of rows : 39
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 V* V358 CMa WR* 07 20 22.3648466568 -23 43 56.522065908   15.04 14.11 13.87   WN4//WC 15 0
3 HD 62910 WR* 07 44 58.2217347768 -31 54 29.554957188 10.08 10.44 10.10 10.17   WN6/WC4 134 0
4 V* V712 Car EB* 10 23 58.0126366512 -57 45 48.937268268 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 176 0
5 [MS70] 1 WR* 10 44 32.1161133312 -57 50 23.983274544   14.71 13.54 13.26   WN5 42 0
6 V* WX Cen WR* 13 12 52.3764011184 -63 23 45.851196156   13.80 13.40     WN3h+WC4 55 0
7 HD 117297 WR* 13 30 53.2514208432 -62 04 51.858208308 10.81 11.10 10.90 10.70   WC8 100 0
8 HD 117688 WR* 13 33 30.1197052368 -62 19 01.214335740 8.69 10.81 10.90 10.44   WN7 134 0
9 MR 51 WR* 13 49 04.4895003144 -65 41 56.121812340 12.75 12.95 12.71 12.89   WN5 63 0
10 WRAY 16-136 WR* 13 49 32.5623529944 -61 31 42.272175756 12.09 11.99 11.69 12.72   WC9d 52 1
11 WRAY 15-1297 WR* 15 13 41.7103828152 -59 11 44.976787404 16.25 15.58 13.65 13.11   WC9d+OB? 62 0
12 WRAY 15-1478 WR* 16 26 37.2301537344 -50 19 22.928419884     14.50     WC9 8 0
13 EM* VRMF 36 WR* 16 28 17.232 -48 17 40.78   17.97 15.37 14.87   WC9 10 0
14 WR 75c WR* 16 34 03.5829153744 -43 40 24.818581704         13.026 WC9 8 0
15 WR 75d WR* 16 34 17.4462409272 -46 08 52.981710792         12.30 WC9 5 0
16 MR 66 WR* 17 02 40.3826152512 -45 59 15.453237084   13.62 12.07 11.77   WC9 67 0
17 CPD-33 4347 WR* 17 18 49.7249262168 -33 57 41.388161760   13.93 12.56 12.21   WN8/WC9 69 0
18 HD 157451 WR* 17 25 23.2779945960 -43 29 31.469964540 10 10.59 10.20 10.46   WC9 96 0
19 MR 74 WR* 17 36 19.8953017656 -33 26 12.271864344 16.01 14.87 13.18 12.99   WC9 93 1
20 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 100 1
21 WRAY 15-1736 WR* 17 36 24.4548433392 -32 54 31.436538840   15.12 13.58 13.30 11.27 WC9 48 0
22 HD 318016 WR* 17 37 13.7436747168 -33 27 56.013254280 13.71 13.16 11.81 11.42   WN8/WC7 83 0
23 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
24 GCIRS 7SW WR* 17 45 39.74 -29 00 23.3           WN8 19 0
25 GCIRS 15SW WR* 17 45 39.92 -29 00 18.1           WN8/WC9 41 0
26 HD 164270 WR* 18 01 43.1453595672 -32 42 55.161329040 8.52 8.97 8.74 9.51   WC9d+? 233 0
27 MR 80 WR* 18 02 04.1244400656 -23 37 42.168277056   15.002 13.155 12.056   WC9 241 1
28 WR 112 WR* 18 16 33.4909366272 -18 58 42.341845368   20.7 17.7     WC8+O6/7III/V 143 0
29 EM* AS 306 WR* 18 27 04.2926310240 -12 22 52.676112720   14.79       WN8h 51 0
30 RAFGL 2179 WR* 18 31 42.2111779224 -09 59 16.687233168   25.0 22.0     WC9 91 0
31 CD-44 12736 PM* 18 36 25.9502475648 -44 18 36.907592904   10.83 10.22     G0 222 0
32 THA 20-1 WR* 18 39 17.9035317744 -10 05 30.898013928   13.07 12.43     WC9d 60 0
33 EM* AS 320 WR* 18 44 13.1526105048 -03 47 57.775268904 13.7 13.340 13.983     WC9d 121 0
34 HD 177230 WR* 19 03 59.0233422072 -04 19 01.910240688 11.32 11.60 11.12     WN8 177 0
35 MR 93 WR* 19 28 15.6142522320 +19 33 21.527693100   14.83       WC7+O9(III) 114 0
36 WR 126 WR* 19 39 56.1963949728 +26 34 42.481553196   13.99 13.29     WC5 38 0
37 HD 193793 WR* 20 20 27.9757908696 +43 51 16.286840244 6.90 7.25 6.85 4.58   WC7pd+O5.5fc 754 0
38 EM* AS 422 WR* 20 32 06.2786571432 +40 48 29.527101576   13.46 11.83     WN7o/CE+O7V(f) 107 0
39 HD 211853 WR* 22 18 45.6057566664 +56 07 33.898679364 8.84 9.534 9.236 9.108   WN6o+O6I 283 0

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