2015ApJ...807...81M


Query : 2015ApJ...807...81M

2015ApJ...807...81M - Astrophys. J., 807, 81 (2015/July-1)

A modern search for Wolf-Rayet stars in the Magellanic Clouds. II. A second year of discoveries.

MASSEY P., NEUGENT K.F. and MORRELL N.

Abstract (from CDS):

The numbers and types of evolved massive stars found in nearby galaxies provide an exacting test of stellar evolution models. Because of their proximity and rich massive star populations, the Magellanic Clouds have long served as the linchpins for such studies. Yet the continued accidental discoveries of Wolf-Rayet (WR) stars in these systems demonstrate that our knowledge is not as complete as usually assumed. Therefore, we undertook a multi-year survey for WRs in the Magellanic Clouds. Our results from our first year (reported previously) confirmed nine new LMC WRs. Of these, six were of a type never before recognized, with WN3-type emission combined with O3-type absorption features. Yet these stars are 2-3 mag too faint to be WN3+O3 V binaries. Here we report on the second year of our survey, including the discovery of four more WRs, two of which are also WN3/O3s, plus two ''slash'' WRs. This brings the total of known LMC WRs to 152, 13 (8.2%) of which were found by our survey, which is now ∼60% complete. We find that the spatial distribution of the WN3/O3s is similar to that of other WRs in the LMC, suggesting that they are descended from the same progenitors. We call attention to the fact that 5 of the 12 known SMC WRs may in fact be similar WN3/O3s rather than the binaries they have often assumed to be. We also discuss our other discoveries: a newly discovered Onfp-type star, and a peculiar emission-line object. Finally, we consider the completeness limits of our survey.

Abstract Copyright:

Journal keyword(s): galaxies: individual: (LMC, SMC) - galaxies: stellar content - Local Group - stars: evolution - stars: Wolf-Rayet

Nomenclature: Tables 1-3: [MNM2015] LMCeNNN-N N=8, [MNM2015] SMCeNNN-N N=2, [MNM2015] LMCNNN-N N=3.

Simbad objects: 25

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Number of rows : 25
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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11941 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10377 1
3 [MNM2015] SMCe107-1 * 01 05 55.19 -71 15 48.2   15.22 15.45     B1-B1.5III 1 0
4 [MNM2015] SMCe107-2 * 01 06 13.72 -71 11 22.3   14.94 15.06     B2I 1 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5539 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6416 1
7 NGC 1624 2 * 04 40 37.2758720568 +50 27 41.040508572 11.9 12.47 11.57     O7f?cp 48 0
8 [MNM2015] LMC156-2 Em* 04 51 10.59 -69 33 21.1   13.52 13.65     ~ 1 0
9 [MNM2015] LMCe116-1 * 05 00 12.31 -67 45 17.5   14.87 14.89     B2III 1 0
10 OGLE LMC-RRLYR-6881 RR* 05 11 17.4531828696 -71 02 43.807482168     16.213   15.721 A 4 0
11 [MNM2015] LMC222-3 * 05 12 54.99 -68 41 12.0   15.90 15.82     B1V 1 0
12 [MNM2015] LMCe132-1 WR* 05 14 17.55 -67 20 35.7   14.21 14.34     O3.5If*/WN5 3 0
13 [MNM2015] LMCe169-1 WR* 05 21 22.84 -65 52 49.0   17.31 17.12     WN3/O3 7 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16259 1
15 [MNM2015] LMC197-1 * 05 23 41.11 -69 04 45.4   16.42 16.54     B3III 1 0
16 [MNM2015] LMCe159-1 WR* 05 24 56.89 -66 26 44.5   16.11 16.34     WN3/O3 6 0
17 HD 269582 WR* 05 27 52.6621673400 -68 59 08.488879836 12.206 10.818 11.093 12.70 11.234 WN10h 100 0
18 IRSF J05291819-6919432 WR* 05 29 18.1865203488 -69 19 43.178139840           WN3+O3V 8 0
19 [MNM2015] LMCe034-1 Em* 05 31 42.05 -70 37 54.0   7.93 8.02     ~ 1 0
20 LHA 120-S 131 WR* 05 38 24.2013464832 -69 29 13.425508392   13.15 12.89 12.91   WN11 21 0
21 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1883 1
22 HD 38489 s*b 05 40 13.3208083008 -69 22 46.485962112 11.236 12.295 11.93 11.79 10.891 B[e] 84 1
23 [MNM2015] LMCe050-1 * 05 43 58.62 -70 14 21.6   13.72 13.93     B2.5I 1 0
24 WRAY 15-682 WR* 10 53 59.5777329720 -60 26 44.361095316   11.64 10.85 10.56   WN11h 144 3
25 NAME Local Group GrG ~ ~           ~ 7772 0

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2022.09.30-02:14:04

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