2017ApJ...837..122M


Query : 2017ApJ...837..122M

2017ApJ...837..122M - Astrophys. J., 837, 122-122 (2017/March-2)

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

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

Abstract (from CDS):

For the past three years we have been conducting a survey for Wolf-Rayet (WR) stars in the Large and Small Magellanic Clouds (LMC, SMC). Our previous work resulted in the discovery of a new type of WR star in the LMC, which we are calling WN3/O3. These stars have the emission-line properties of a WN3 star (strong N V, but no N IV), plus the absorption-line properties of an O3 star (Balmer hydrogen plus Pickering He II, but no He I). Yet, these stars are 15 times fainter than an O3 V star, ruling out the possibility that WN3/O3s are WN3+O3 binaries. Here we report the discovery of two more members of this class, bringing the total number of these objects to 10, 6.5% of the LMC's total WR population. The optical spectra of nine of these WN3/O3s are virtually indistinguishable from each other, but one of the newly found stars is significantly different, showing a lower excitation emission and absorption spectrum (WN4/O4-ish). In addition, we have newly classified three unusual Of-type stars, including one with a strong C III λ4650 line, and two rapidly rotating "Oef" stars. We also "rediscovered" a low mass X-ray binary, RX J0513.9-6951, and demonstrate its spectral variability. Finally, we discuss the spectra of 10 low priority WR candidates that turned out to not have He II emission. These include both a Be star and a B[e] star.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

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

Nomenclature: Tables 1-3: [MNM2015] LMCeNNN-N N=14 added, [MNM2015] SMCeNNN-N N=2 added.

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 23

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Number of rows : 23
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 [MNM2015] SMCe055-1 * 00 29 46.91 -73 08 40.6   15.59 15.65     ~ 1 0
2 2dFS 562 * 00 45 28.3726857912 -73 56 36.700310796   14.91 14.98     B2(II) 4 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10317 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6373 1
5 SK -67 3 Em* 04 49 28.0159439784 -67 42 39.829742676   12.96 13.20     OB 5 0
6 [M2002] LMC 8808 * 04 50 47.11 -70 37 57.8 14.65 15.24 15.15 15.26   ~ 1 0
7 [MNM2015] LMCe141-1 * 04 51 19.42 -66 52 18.9   16.93 16.90     ~ 1 0
8 OGLE LMC-ECL-3548 EB* 04 56 48.8111998200 -69 36 40.611374928     16.292   16.381 ~ 7 0
9 [M2002] LMC 41535 * 04 59 02.04 -70 48 53.5 14.65 15.24 15.15 15.26   ~ 1 0
10 [MNM2015] LMCe155-1 * 05 03 37.35 -66 33 19.5   16.24 16.42     ~ 1 0
11 [MNM2015] LMCe117-2 * 05 05 43.53 -67 53 53.0   16.80 16.85     ~ 1 0
12 [MNM2015] LMCe117-1 * 05 06 13.53 -67 49 11.3   16.05 15.96     ~ 1 0
13 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 309 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
15 IRSF J05291819-6919432 WR* 05 29 18.1865203488 -69 19 43.178139840           WN3+O3V 8 0
16 [MNM2015] LMCe005-1 * 05 31 31.76 -71 56 10.1   16.20 16.27     ~ 1 0
17 [MNM2015] LMCe078-2 Em* 05 37 27.84 -69 23 52.9   13.22 13.38     ~ 1 0
18 MCPS 084.37367-69.24772 s*b 05 37 29.6204974056 -69 14 51.935383068 12.493 13.464 13.486   13.651 O5.5Iaf 2 0
19 [MNM2015] LMCe078-3 WR* 05 41 17.50 -69 06 56.2   17.06 17.03     ~ 6 0
20 2E 1550 XB* 05 43 34.1600044704 -68 22 22.191505716   15.9   17.2 16.54 ~ 312 0
21 [MNM2015] LMCe050-2 * 05 46 05.71 -69 59 57.2   16.85 16.65     ~ 1 0
22 HD 215835 SB* 22 46 54.1107754872 +58 05 03.533752788 8.24 8.85 8.629   8.049 O5.5V((f))+O6V((f)) 245 0
23 NAME Local Group GrG ~ ~           ~ 7723 0

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2022.08.14-11:37:08

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