2015A&A...584A..33B


Query : 2015A&A...584A..33B

2015A&A...584A..33B - Astronomy and Astrophysics, volume 584A, 33-33 (2015/12-1)

Identification of dusty massive stars in star-forming dwarf irregular galaxies in the Local Group with mid-IR photometry.

BRITAVSKIY N.E., BONANOS A.Z., MEHNER A., BOYER M.L. and McQUINN K.B.W.

Abstract (from CDS):

Increasing the statistics of spectroscopically confirmed evolved massive stars in the Local Group enables the investigation of the mass loss phenomena that occur in these stars in the late stages of their evolution. We aim to complete the census of luminous mid-IR sources in star-forming dwarf irregular (dIrr) galaxies of the Local Group. To achieve this we employed mid-IR photometric selection criteria to identify evolved massive stars, such as red supergiants (RSGs) and luminous blue variables (LBVs), by using the fact that these types of stars have infrared excess due to dust. The method is based on 3.6µm and 4.5µm photometry from archival Spitzer Space Telescope images of nearby galaxies. We applied our criteria to four dIrr galaxies: Pegasus, Phoenix, Sextans A, and WLM, selecting 79 point sources that we observed with the VLT/FORS2 spectrograph in multi-object spectroscopy mode. We identified 13 RSGs, of which 6 are new discoveries, as well as two new emission line stars, and one candidate yellow supergiant. Among the other observed objects we identified carbon stars, foreground giants, and background objects, such as a quasar and an early-type galaxy that contaminate our survey. We use the results of our spectroscopic survey to revise the mid-IR and optical selection criteria for identifying RSGs from photometric measurements. The optical selection criteria are more efficient in separating extragalactic RSGs from foreground giants than mid-IR selection criteria, but the mid-IR selection criteria are useful for identifying dusty stars in the Local Group. This work serves as a basis for further investigation of the newly discovered dusty massive stars and their host galaxies.

Abstract Copyright:

Journal keyword(s): stars: massive - stars: late-type - galaxies: individual: Sex A - supergiants

Nomenclature: Table A.1: [BBM2015] Phoenix NN (Nos 1-14). Table A.2: [BBM2015] Pegasus NN (Nos 1-19). Table A.3: [BBM2015] Sextans A NN (Nos 1-15). Table A.4: [BBM2015] WLM NN (Nos 1-31).

Simbad objects: 55

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Number of rows : 55
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 [BD2004a] 12 C* 00 01 51.70 -15 25 36.7       22.439 20.958 C 2 0
2 2MASS J00015376-1528498 * 00 01 53.7749604120 -15 28 49.799981928   20.33 18.83 18.82   M1-3II 1 0
3 LGGS J000157.55-152915.8 s*r 00 01 57.5634278986 -15 29 16.365531693   20.91 19.26 18.41   K0-1I 4 0
4 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 631 2
5 [BD2004a] 62 C* 00 01 58.22 -15 29 59.3   22.33 22.61 21.031 19.642 C 3 0
6 [BD2004a] 75 C* 00 01 59.19 -15 27 00.7   21.55 21.93 20.649 19.581 C 3 0
7 [SC85b] 4 s*r 00 01 59.6284627968 -15 31 00.488858520 22.31 20.20 18.97 18.07 17.25 K2-3I 7 0
8 [BBM2015] WLM 12 * 00 01 59.97 -15 29 41.3   21.85 22.14 22.11   G 2 0
9 WISE J000200.26-152947.8 * 00 02 00.35 -15 29 46.9   22.97 21.39 21.33   K 1 0
10 [SC85b] 6 s*r 00 02 00.8368265016 -15 31 16.255453476 21.24 20.30 18.69 17.78 17.44 K0-1I 7 0
11 [BD2004a] 105 C* 00 02 01.45 -15 28 36.1   23.36 21.81 20.085 19.016 C 3 0
12 LGGS J000203.04-153033.7 s*r 00 02 03.0614444112 -15 30 34.264656252   20.66 18.67 17.64   K5I 2 0
13 WISE J000204.66-152936.1 * 00 02 04.6601698416 -15 29 36.552519852   22.52 21.01 20.94   G-K 2 0
14 [BD2004a] 138 C* 00 02 05.6281153584 -15 33 16.782880752       22.07 20.715 C 2 0
15 USNO-B1.0 0745-00000539 * 00 02 06.08 -15 28 41.8   23.32 21.68 21.53   K 1 0
16 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10381 1
17 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1175 2
18 2MASS J01505592-4424590 * 01 50 55.9148176272 -44 24 59.095600344   19.16 18.04 18.03   K3-4 1 0
19 2MASS J01505667-4428274 * 01 50 56.6604759384 -44 28 27.337177560   21.8 20.39 20.37   M2-4 1 0
20 2MASS J01510103-4428149 C* 01 51 01.0000878984 -44 28 14.862484848       20.6   C 1 0
21 2MASS J01510336-4428105 * 01 51 03.370 -44 28 10.57   20.96 19.47 19.46   K2-3 1 0
22 2MASS J01510473-4427299 PM* 01 51 04.7042187336 -44 27 29.888345412   19.95 18.41 18.4   M4-6 1 0
23 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 500 2
24 UCAC4 228-001824 * 01 51 07.8653905176 -44 24 38.755794204   17.12 16.44 16.43   GII 1 0
25 2MASS J01510879-4425287 C* 01 51 08.8213279224 -44 25 28.576171272       20.6   C 2 0
26 WISE J015110.80-442509.8 s*r 01 51 10.8108022992 -44 25 09.539062932   20.67 19.50 19.49   K1-2I 1 0
27 [BBM2015] Phoenix 7 * 01 51 12.7327627896 -44 24 09.687759516   19.8 18.74 18.73   KII 1 0
28 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6418 1
29 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16265 1
30 [BBM2014] Sex A 4 s*r 10 10 53.8114381248 -04 41 07.279832112   20.155 18.29 17.360   K1-3I 4 0
31 [VPW98] 2196 s*r 10 10 55.3078497408 -04 42 43.690964004   21.51 19.93 19.91 18.09 K1-3I 4 0
32 DENIS J101056.5-044209 s*r 10 10 56.566 -04 42 09.00   21.3 19.85 19.84 18.36 K1-3I 3 0
33 [BBM2014] Sex A 6 s*r 10 10 56.7127312488 -04 40 38.992967544   20.495 18.59 17.604   K3-5I 3 0
34 [BBM2014] Sex A 2 RG* 10 11 00.0030183096 -04 39 06.053161968   20.581 19.09 18.111   M0-2II 2 0
35 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 697 2
36 [VPW98] 659 s*r 10 11 03.9394021944 -04 42 28.415740248   21.79 20.03 20.01 18.20 K1-3I 2 0
37 [VPW98] 525 * 10 11 04.8643897080 -04 43 05.132130276   22.32 20.70 20.64   G-K 2 0
38 [VPW98] 434 s*r 10 11 05.5434577896 -04 41 56.814395676   20.221 18.32 17.330   K1-3I 3 0
39 [VPW98] 298 s?y 10 11 06.3798907080 -04 42 18.161843868   21.02 19.58 19.56   G-F? 3 0
40 [VPW98] 97 * 10 11 09.22 -04 42 42.0     21.131     G-K 3 0
41 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2342 0
42 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2426 2
43 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1504 0
44 [BBM2015] Pegasus 12 * 23 28 23.9719919808 +14 45 10.786341276   21.94 20.23 20.2   M0-2 1 0
45 2MASS J23282578+1444303 * 23 28 25.7801946624 +14 44 30.335248428   22.04 20.29 20.26   M4-6II 1 0
46 USNO-B1.0 1047-00646825 * 23 28 29.5896050904 +14 44 33.431451108   21.91 20.12 20.08   G 1 0
47 2MASS J23283026+1444589 s*r 23 28 30.262 +14 44 58.91   22.75 20.68 20.61   K4-5I 1 0
48 ULAS J232831.20+144309.1 * 23 28 31.2139187472 +14 43 09.048001548   21.65 20.16 20.12   K2-3 1 0
49 2MASS J23283291+1442020 * 23 28 32.9159217816 +14 42 02.076496164   19.84 18.41 18.4   K2-4III 1 0
50 NAME PegDIG G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 452 1
51 [BBM2015] Pegasus 1 s*r 23 28 35.8712828568 +14 44 13.521801840   22.94 20.72 20.64   M0-2I 2 0
52 [BD2000] Pegasus C37 C* 23 28 36.670 +14 44 55.86           C 3 0
53 SDSS J232839.18+144402.4 * 23 28 39.1813184256 +14 44 02.433057684   20.77 19.55 19.54   K3-4II 1 0
54 2MASS J23284510+1443138 * 23 28 45.1088187552 +14 43 13.802125656   20.3 18.71 18.7   M0-2II 1 0
55 NAME Local Group GrG ~ ~           ~ 7772 0

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2022.10.02-01:35:56

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