2016ApJ...833..133T


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET02:09:33

2016ApJ...833..133T - Astrophys. J., 833, 133-133 (2016/December-3)

A new prescription for the mass-loss rates of WC and WO stars.

TRAMPER F., SANA H. and DE KOTER A.

Abstract (from CDS):

We present a new empirical prescription for the mass-loss rates of carbon- and oxygen-sequence Wolf-Rayet stars as a function of their luminosity, surface chemical composition, and initial metallicity. The new prescription is based on results of detailed spectral analyses of WC and WO stars and improves the often applied Nugis and Lamers relation. We find that the mass-loss rates of WC and WO stars (with X = 0 and Y <= 0.98) can be expressed as log -9.20+0.85log(L/L) + 0.44 log Y + 0.25 log (ZFe/ZFe,☉). This relation is based on mass-loss determinations that assume a volume-filling factor of 0.1, but the prescription can easily be scaled to account for other volume-filling factors. The residual of the fit is σ = 0.06 dex. We investigated whether the relation can also describe the mass loss of hydrogen-free WN stars and showed that it can when an adjustment of the metallicity dependence (log =∝1.3log(ZFe/ZFe,☉)) is applied. Compared to that of Nugis and Lamers, =is less sensitive to the luminosity and the surface abundance, implying a stronger mass loss of massive stars in their late stages of evolution. The modest metallicity dependence implies that if WC or WO stars are formed in metal-deficient environments, their mass-loss rates are higher than currently anticipated. These effects may result in the formation of a larger number of SNe Ic and fewer black holes and may favor the production of superluminous SNe Ic through interaction with C- and O-rich circumstellar material or dense stellar wind.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

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

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9228 1
2 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1093 2
3 NAME DR 1 in IC 1613 WR* 01 05 01.61 +02 04 20.6     20.7     WR 21 2
4 HD 32257 WR* 04 56 02.8932766544 -69 27 21.547497496 13.441 13.962 14.23 14.31 14.514 WC 45 0
5 HD 32125 WR* 04 56 11.0963828140 -66 17 33.055645578 13.704 14.295 14.33   14.618 WC 49 0
6 HD 32402 WR* 04 57 24.0824729521 -68 23 57.122171327   12.53 12.69 13.24   WC 69 0
7 [H2013] LMCe 584 * 05 18 11.01 -69 13 11.3 12.88 14.26 13.95     WO4 8 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14543 1
9 HD 37026 WR* 05 30 12.1637558730 -67 26 08.329160840 12.853 13.16 13.53 13.56 13.856 WC 68 0
10 HD 37680 WR* 05 34 19.2497853756 -69 45 10.298101295 12.807 12.98 13.25 13.21 13.490 WC 67 1
11 HD 269888 WR* 05 37 44.6347648981 -69 14 25.676649551 14.413 14.772 14.628 14.81 14.761 WR 40 0
12 Brey 93 WR* 05 39 34.3021354505 -68 44 09.160887870 14.291 15.626 15.204   15.620 WO3 61 0
13 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 831 0
14 [MS70] 1 WR* 10 44 32.1161451494 -57 50 23.981450852   14.71 13.54 13.26   WN5 33 0
15 MR 51 WR* 13 49 04.4894389061 -65 41 56.120790651 12.75 12.95 12.71 12.89   WN5 55 0
16 HD 156385 WR* 17 19 29.9012727857 -45 38 23.874796927 6.55 6.97 6.92 8.11   WC7 151 0
17 WR 93b WR* 17 32 03.3085935721 -35 04 32.618191778           WO3 14 0
18 V* V3893 Sgr WR* 17 45 47.5403190596 -26 10 26.777772852   15.13 14.20 14.23   WR 105 1
19 HD 164270 WR* 18 01 43.1452971756 -32 42 55.161881733 8.52 8.97 8.74 9.51   WC9d+? 209 0
20 HD 165763 WR* 18 08 28.4691215895 -21 15 11.182287576 7.16 7.54 7.82 8.55   WC6 263 0
21 HD 192103 WR* 20 11 53.5274946554 +36 11 50.523501826 7.77 8.13 8.11     WC8+OB: 315 0
22 WR 142 WR* 20 21 44.3438534563 +37 22 30.543604467   14.39 12.99 12.73 11.04 WO2 119 0
23 EM* AS 422 WR* 20 32 06.2783569769 +40 48 29.521225515   13.46 11.83     WN7o/CE+O7V(f) 91 0
24 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC5-6e+O8 138 1

    Equat.    Gal    SGal    Ecl

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2020.02.20-02:09:33

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