2020MNRAS.493.2410W


Query : 2020MNRAS.493.2410W

2020MNRAS.493.2410W - Mon. Not. R. Astron. Soc., 493, 2410-2428 (2020/April-1)

Candidate LBV stars in galaxy NGC 7793 found via HST photometry + MUSE spectroscopy.

WOFFORD A., RAMIREZ V., LEE J.C., THILKER D.A., DELLA BRUNA L., ADAMO A., VAN DYK S.D., HERRERO A., KIM H., ALOISI A., CALZETTI D., CHANDAR R., DALE D.A., DE MINK S.E., GALLAGHER J.S., GOULIERMIS D.A., GRASHA K., GREBEL E.K., SACCHI E., SMITH L.J., UBEDA L., WALTERBOS R.A.M., HANNON S. and MESSA M.

Abstract (from CDS):

Only about 19 Galactic and 25 extragalactic bonafide luminous blue variables (LBVs) are known to date. This incomplete census prevents our understanding of this crucial phase of massive star evolution which leads to the formation of heavy binary black holes via the classical channel. With large samples of LBVs one could better determine the duration and maximum stellar luminosity which characterize this phase. We search for candidate LBVs (cLBVs) in a new galaxy, NGC 7793. For this purpose, we combine high spatial resolution images from two Hubble Space Telescope (HST) programs with optical spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE). By combining PSF-fitting photometry measured on F547M, F657N, and F814W images, with restrictions on point-like appearance (at HST resolution) and H α luminosity, we find 100 potential cLBVs, 36 of which fall in the MUSE fields. Five of the latter 36 sources are promising cLBVs which have MV <= -7 and a combination of: H α with a P-Cygni profile; no [O I] λ6300 emission; weak or no [O III] λ5007 emission; large [N II]/H α relative to H II regions; and [S II] λ6716/[S II] λ6731∼1. It is not clear if these five cLBVs are isolated from O-type stars, which would favour the binary formation scenario of LBVs. Our study, which approximately covers one fourth of the optical disc of NGC 7793, demonstrates how by combining the above HST surveys with multi-object spectroscopy from 8-m class telescopes, one can efficiently find large samples of cLBVs in nearby galaxies.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): catalogues - stars: massive - stars: variables: S Doradus - galaxies: individual: NGC 7793

Nomenclature: Tables 3, A1: [WRL2020] NN (Nos 1-36).

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 774 2
2 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1111 1
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12559 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11043 1
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 504 0
6 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1228 2
7 LHA 115-N 88A HII 01 24 07.823 -73 09 03.77   13.25 12.18     ~ 74 1
8 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5811 1
9 HD 17638 WR* 02 52 11.6613087600 +56 56 07.131052500 10.99 10.86 10.41     WC6 119 0
10 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6984 1
11 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 681 2
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17265 1
13 HD 269687 WR* 05 31 25.5247745448 -69 05 38.556251700 10.86 11.78 11.87 12.05   WN11h 109 0
14 HD 269858 s*b 05 36 43.6936418088 -69 29 47.451149232   10.24 10.15 9.95 9.05 LBV 281 2
15 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 234 0
16 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 563 3
17 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 764 0
18 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1781 1
19 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4420 3
20 UGC 5340 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55   ~ 225 1
21 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 629 0
22 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1168 1
23 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2889 2
24 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1553 0
25 [WRL2020] 28 s?b 23 57 40.3280 -32 35 53.519 25.763 24.446 22.586   20.602 ~ 1 0
26 [WRL2020] 32 s?b 23 57 40.5250 -32 35 33.206 21.570 22.957 23.055   22.812 ~ 1 0
27 [WRL2020] 30 s?b 23 57 40.8120 -32 35 36.533 21.098 22.723 22.805   22.710 ~ 1 0
28 [WRL2020] 20 s?b 23 57 40.8230 -32 35 37.211 20.012 21.501 21.730   21.849 ~ 1 0
29 [WRL2020] 5 s?b 23 57 40.8720 -32 35 36.706 18.851 20.375 20.512   20.598 ~ 1 0
30 [WRL2020] 36 s?b 23 57 41.0360 -32 35 34.696 23.102 23.924 24.262   22.892 ~ 1 0
31 [WRL2020] 3 s?b 23 57 41.1700 -32 36 16.184 18.984 20.140 20.047   19.816 ~ 1 0
32 [WRL2020] 13 s?b 23 57 41.2210 -32 34 50.083 19.626 21.081 21.174   21.162 ~ 1 0
33 [WRL2020] 9 s?b 23 57 41.2920 -32 35 49.332 22.632 21.599 20.811   19.697 ~ 1 0
34 [WRL2020] 18 s?b 23 57 41.3830 -32 35 52.587 20.374 21.565 21.623   21.090 ~ 1 0
35 [WRL2020] 11 s?b 23 57 41.3940 -32 35 53.490 22.503 21.731 20.989   19.971 ~ 1 0
36 [WRL2020] 4 s?b 23 57 41.4000 -32 35 52.769 19.066 20.245 20.138   19.875 ~ 1 0
37 [WRL2020] 29 s?b 23 57 41.4250 -32 35 35.809 21.942 22.891 22.613   21.994 ~ 1 0
38 [WRL2020] 21 s?b 23 57 41.6720 -32 34 35.971   24.273     19.918 ~ 1 0
39 [WRL2020] 35 s?b 23 57 42.6480 -32 34 39.271 21.997 23.521 23.669   23.805 ~ 1 0
40 [WRL2020] 34 s?b 23 57 42.7550 -32 35 26.029 21.934 23.398 23.478   23.219 ~ 1 0
41 [WRL2020] 23 s?b 23 57 43.3730 -32 35 49.305 22.404 22.198 21.839   21.327 ~ 1 0
42 [WRL2020] 12 s?b 23 57 43.4160 -32 35 52.641 19.591 21.031 21.170   21.117 ~ 1 0
43 [WRL2020] 16 s?b 23 57 43.4420 -32 35 04.726 19.937 21.473 21.421   21.372 ~ 1 0
44 [WRL2020] 25 s?b 23 57 43.5890 -32 36 16.642 20.809 22.037 22.112   22.075 ~ 1 0
45 [WRL2020] 1 s?b 23 57 43.6170 -32 35 10.691 20.668 19.857 19.388   18.744 ~ 1 0
46 [WRL2020] 33 s?b 23 57 43.6470 -32 34 14.648 21.910 23.456 23.250   23.124 ~ 1 0
47 [WRL2020] 15 s?b 23 57 43.7490 -32 35 17.408 21.210 21.469 21.382   20.846 ~ 1 0
48 [WRL2020] 22 s?b 23 57 43.8720 -32 36 02.178   23.455 21.826   20.351 ~ 1 0
49 [WRL2020] 27 s?b 23 57 43.8780 -32 35 45.186   24.354 22.405   19.972 ~ 1 0
50 [WRL2020] 19 s?b 23 57 43.9640 -32 34 35.874 21.585 21.780 21.641   21.351 ~ 1 0
51 [WRL2020] 24 s?b 23 57 44.1380 -32 34 33.512 23.222 23.364 21.898   20.222 ~ 1 0
52 [WRL2020] 8 s?b 23 57 44.6000 -32 34 37.653 19.476 20.904 20.762   20.667 ~ 1 0
53 [WRL2020] 14 s?b 23 57 44.6900 -32 35 41.549 22.784 21.989 21.286   20.260 ~ 1 0
54 [WRL2020] 6 s?b 23 57 44.7390 -32 34 37.020 22.267 21.407 20.705   19.873 ~ 1 0
55 [WRL2020] 31 s?b 23 57 44.8250 -32 34 48.969 21.475 22.933 22.987   22.899 ~ 1 0
56 [WRL2020] 26 s?b 23 57 45.4870 -32 34 28.146 23.162 23.069     24.071 ~ 1 0
57 [WRL2020] 2 s?b 23 57 45.8210 -32 34 38.168 19.304 20.004 19.888   19.738 ~ 1 0
58 [WRL2020] 10 s?b 23 57 45.8990 -32 35 03.626 20.350 21.008 20.840   20.469 ~ 1 0
59 [WRL2020] 7 s?b 23 57 46.2280 -32 35 00.058 21.843 21.752 20.720   19.707 ~ 1 0
60 [WRL2020] 17 s?b 23 57 46.3080 -32 34 43.224 22.948 22.230 21.488   20.691 ~ 1 0
61 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1094 2

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