2015A&A...575A..10D


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.02CEST00:04:55

2015A&A...575A..10D - Astronomy and Astrophysics, volume 575A, 10-10 (2015/3-1)

First detections of FS Canis Majoris stars in clusters. Evolutionary state as constrained by coeval massive stars.

DE LA FUENTE D., NAJARRO F., TROMBLEY C., DAVIES B. and FIGER D.F.

Abstract (from CDS):

FS CMa stars are low-luminosity objects showing the B[e] phenomenon whose evolutionary state remains a puzzle. These stars are surrounded by compact disks of warm dust of unknown origin. Hitherto, membership of FS CMa stars to coeval populations has never been confirmed. The discovery of low-luminosity line emitters in the young massive clusters Mercer 20 and Mercer 70 prompts us to investigate the nature of such objects. We intend to confirm membership to coeval populations in order to characterize these emission-line stars through the cluster properties. Based on ISAAC/VLT medium-resolution spectroscopy and NICMOS/HST photometry of massive cluster members, new characterizations of Mercer 20 and Mercer 70 are performed. Coevality of each cluster and membership of the newly-discovered B[e] objects are investigated using our observations as well as literature data of the surroundings. Infrared excess and narrow-band photometric properties of the B[e] stars are also studied. We confirm and classify 22 new cluster members, including Wolf-Rayet stars and blue hypergiants. Spectral types (O9-B1.5 V) and radial velocities of B[e] objects are compatible with the remaining cluster members, while emission features of MgII, FeII], and [FeII] are identified in their spectra. The ages of these stars are 4.5 and 6Myr, and they show mild infrared excesses. We confirm the presence of FS CMa stars in the coeval populations of Mercer 20 and Mercer 70. We discuss the nature and evolutionary state of FS CMa stars, discarding a post-AGB nature and introducing a new hypothesis about mergers. A new search method for FS CMa candidates in young massive clusters based on narrow-band Paschen-α photometry is proposed and tested in photometric data of other clusters, yielding three new candidates.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: massive - circumstellar matter - open clusters and associations: individual: Mercer 20 - techniques: spectroscopic - open clusters and associations: individual: Mercer 70

Nomenclature: Figs 7-8: [DNT2015] McNN-NN (Nos Mc20-1 to Mc20-17, Mc70-1 to Mc70-14). Table 4: [DCT2012] DN-NN (Nos D1-13, D1-14) added. Fig. 15, Table 4: [DDN2012] NN (No. 28) added.

Status at CDS:  

Simbad objects: 69

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Number of rows : 69

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 EM* GGA 2 LP* 00 50 05.9727482194 +64 45 35.076744599   12.406 11.545     Beq 20 0
2 Ass Cas OB 7 As* 00 50 14 +64 04.3           ~ 58 0
3 V* MO Cam Be* 03 58 59.4436379432 +56 11 12.626367652 13.618 11.97 11.26     Be 28 0
4 HD 45677 Be* 06 28 17.4219761127 -13 03 11.130589443 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 302 0
5 HD 50138 Ae* 06 51 33.3989891154 -06 57 59.445949919 6.28 6.68 6.67     A1Ib/II 196 0
6 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2178 0
7 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 57 0
8 Cl Danks 2 OpC 13 12 55 -62 40.9           ~ 53 0
9 MSXDC G329.67+0.85 a cor 15 59 20 -52 00.9           ~ 2 0
10 IRAS 15557-5215 HII 15 59 36.3 -52 23 46           ~ 10 0
11 [EVM96] 329.48+0.51 Mas 15 59 40.1 -52 22 46           ~ 2 0
12 EGO G329.47+0.50 of? 15 59 40.71 -52 23 27.3           ~ 12 0
13 [DNT2015] Mc70-2 * 16 00 26.000 -52 10 57.42           KM 1 0
14 [DNT2015] Mc70-7 * 16 00 26.310 -52 11 10.73           WC7 1 0
15 2MASS J16002643-5211099 WR* 16 00 26.430 -52 11 09.93       19.70   WC7 3 0
16 [DNT2015] Mc70-12 * 16 00 26.480 -52 10 51.20           O6.5-8III-V 1 0
17 [MCM2005b] 70 OpC 16 00 27 -52 10.8           ~ 5 0
18 [DNT2015] Mc70-4 * 16 00 27.080 -52 10 55.65           B0-2I-II 1 0
19 [DNT2015] Mc70-13 * 16 00 27.400 -52 10 57.90           O7.5-8.5III-IV 1 0
20 [DNT2015] Mc70-3 * 16 00 27.560 -52 10 44.03           O9I 1 0
21 [DNT2015] Mc70-14 * 16 00 27.600 -52 10 46.66           ~ 1 0
22 [DNT2015] Mc70-1 * 16 00 27.750 -52 10 44.39           B0-2Ia+ 1 0
23 [DNT2015] Mc70-8 * 16 00 27.860 -52 10 48.95           OIfpe/WN 1 0
24 [DNT2015] Mc70-11 * 16 00 27.980 -52 10 51.60           O9III 1 0
25 [DNT2015] Mc70-6 * 16 00 28.150 -52 11 03.13           B0-2Ia+ 1 0
26 [DNT2015] Mc70-5 * 16 00 28.800 -52 10 51.02           O6I 1 0
27 [DNT2015] Mc70-10 * 16 00 32.060 -52 10 53.31           KM 1 0
28 [DNT2015] Mc70-9 * 16 00 33.770 -52 10 54.68           G 1 0
29 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 16 0
30 [DDN2012] 28 * 16 40 30.73 -46 23 17.8           ~ 1 0
31 * zet01 Sco s*b 16 53 59.7270104119 -42 21 43.313745214 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 346 0
32 CD-42 11721 Be* 16 59 06.7622892572 -42 42 08.404916931 12.16 12.28 11.00     B0IVe 154 1
33 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11312 0
34 [FMM95] 3 Em* 17 46 15.240 -28 50 03.58           ~ 137 1
35 [GMC99] D6 * 17 46 17.982 -28 49 03.46           ~ 53 0
36 V* V1309 Sco CV* 17 57 32.9383021931 -30 43 09.967391199   16.9   14.8   ~ 171 0
37 NAME Mercer 5 Cl* 18 23 19 -13 40.0           ~ 13 0
38 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 320 0
39 [MKJ2009] 58 MoC 19 11 55.3 +09 49 56           ~ 2 0
40 EGO G044.01-0.03 of? 19 11 57.2 +09 50 05           ~ 8 0
41 [ABJ2009] U44.26+0.10 HII 19 11 57.7 +10 07 05           ~ 17 0
42 [UHP2009] VLA G044.3103+00.0410 HII 19 12 15.7 +10 07 53           ~ 2 1
43 2MASS J19121570+1007535 Y*O 19 12 15.705 +10 07 53.53           ~ 8 1
44 [MDI2009] GLIMPSE20 9 * 19 12 21.4648011513 +09 56 53.105261530           OB 2 0
45 [DNT2015] Mc20-11 * 19 12 22.6463324713 +09 57 15.645754076           O8.5-9II 1 0
46 [DNT2015] Mc20-7 * 19 12 22.6902773634 +09 57 10.039774647           O9II 1 0
47 [DNT2015] Mc20-12 * 19 12 22.7128695956 +09 57 05.526815655           O9III 1 0
48 2MASS J19122314+0956463 * 19 12 23.143 +09 56 46.38           OB 2 0
49 [DNT2015] Mc20-3 * 19 12 23.18 +09 56 46.0           B2-4I-II 1 0
50 [DNT2015] Mc20-17 * 19 12 23.29 +09 58 44.7           O9-B2III-V 1 0
51 [DNT2015] Mc20-2 * 19 12 23.3064226869 +09 57 04.492156520           O9.5-B0I-II 1 0
52 [MDI2009] GLIMPSE20 11 * 19 12 23.3970836171 +09 57 33.781633418           K-M 2 0
53 [DNT2015] Mc20-13 * 19 12 23.53 +09 57 29.7           KM 1 0
54 2MASS J19122356+0957378 * 19 12 23.566 +09 57 37.82           OB 2 0
55 [DNT2015] Mc20-1 * 19 12 23.61 +09 57 37.4           B0-3I 1 0
56 2MASS J19122369+0957188 * 19 12 23.695 +09 57 18.89           K-M 2 0
57 [DNT2015] Mc20-6 * 19 12 23.72 +09 57 19.0           O9-9.5I 1 0
58 2MASS J19122372+0957081 s*y 19 12 23.7305052221 +09 57 07.890085134           GI 2 0
59 [DNT2015] Mc20-8 * 19 12 24.05 +09 57 29.1           WC5-7 1 0
60 [DNT2015] Mc20-9 * 19 12 24.06 +09 57 28.2           O6If 1 0
61 2MASS J19122407+0957290 WR* 19 12 24.079 +09 57 29.00           WC 2 0
62 [DNT2015] Mc20-5 * 19 12 24.1460961281 +09 57 22.754325842           O9e 1 0
63 [DNT2015] Mc20-10 * 19 12 24.17 +09 57 28.6           WC5-7 1 0
64 [DNT2015] Mc20-16 * 19 12 24.35 +09 57 30.5           ~ 1 0
65 [DNT2015] Mc20-15 * 19 12 24.4951697021 +09 57 18.668811806           O5If 1 0
66 [DNT2015] Mc20-14 * 19 12 24.93 +09 56 52.6           KM 1 0
67 [MCM2005b] 20 OpC 19 12 25 +09 57.7           ~ 10 0
68 [DNT2015] Mc20-4 * 19 12 25.7782911226 +09 57 38.099065577           O9I 1 0
69 EM* MWC 349A * 20 32 45.5290328485 +40 39 36.647044678           ~ 143 0

    Equat.    Gal    SGal    Ecl

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2020.04.02-00:04:55

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