2014A&A...567A..66R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:59:14

2014A&A...567A..66R - Astronomy and Astrophysics, volume 567A, 66-66 (2014/7-1)

Masgomas-4: Physical characterization of a double-core obscured cluster with a massive and very young stellar population.

RAMIREZ ALEGRIA S., MARIN-FRANCH A. and HERRERO A.

Abstract (from CDS):

The discovery of new, obscured massive star clusters has changed our understanding of the Milky Way star-forming activity from a passive to a very active star-forming machine. The search for these obscured clusters is strongly supported by the use of all-sky, near-IR surveys. The main goal of the MASGOMAS project is to search for and study unknown, young, and massive star clusters in the Milky Way, using near-IR data. Here we try to determine the main physical parameters (distance, size, total mass, and age) of Masgomas-4, a new double-core obscured cluster. Using near-IR photometry (J, H, and KS) we selected a total of 21 stars as OB-type star candidates. Multi-object, near-IR follow-up spectroscopy allowed us to carry out the spectral classification of the OB-type candidates. Of the 21 spectroscopically observed stars, ten are classified as OB-type stars, eight as F- to early G-type dwarf stars, and three as late-type giant stars. Spectroscopically estimated distances indicate that the OB-type stars belong to the same cluster, located at a distance of 1.90+1.28–0.90kpc. Our spectrophotometric data confirm a very young and massive stellar population, with a clear concentration of pre-main-sequence massive candidates (Herbig Ae/Be) around one of the cluster cores. The presence of a surrounding HII cloud and the Herbig Ae/Be candidates indicate an upper age limit of 5Myr.

Abstract Copyright:

Journal keyword(s): infrared: stars - stars: early-type - stars: massive - open clusters and associations: individual: Masgomas-4 - techniques: photometric - techniques: spectroscopic

Nomenclature: Masgomas-N (No. 4) added. Fig. 2, Table 2: [RMH2014] NNa (Nos 1a-12a, 1b-9b).

Simbad objects: 54

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Number of rows : 54

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 HD 36166 V* 05 29 54.7755487007 +01 47 21.323228963 4.74 5.562 5.745     B2V 109 0
2 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 379 0
3 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
4 * mu. UMa SB* 10 22 19.7397659 +41 29 58.269105 6.53 4.64 3.05 1.76 0.80 M0III 291 0
5 * nu. Vir LP* 11 45 51.5595736 +06 31 45.741287 7.32 5.54 4.04 2.79 1.78 M1III 237 0
6 * eta UMa PM* 13 47 32.43776 +49 18 47.7602 0.99 1.67 1.86 1.98 2.16 B3V 579 0
7 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 427 1
8 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1724 2
9 * kap Oph LP? 16 57 40.0978499 +09 22 30.112596 5.52 4.36 3.20 2.36 1.82 K2III 286 0
10 Cl Alicante 8 OpC 18 34 51.0 -07 14 00           ~ 21 0
11 RSGC 1 OpC 18 37 58 -06 53.0           ~ 87 0
12 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 82 0
13 Cl Alicante 7 OpC 18 44 29.45 -03 30 02.4           ~ 17 0
14 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 46 0
15 Cl Alicante 10 Cl* 18 45 30 -03 40.0           ~ 5 0
16 Masgomas-1 Cl* 18 50 15.408 +00 20 58.07           ~ 5 0
17 [RMH2014] 11a * 18 56 00.2714394671 +07 56 53.915091111           F6-8V 1 0
18 [RMH2014] 12a * 18 56 00.7148972261 +07 56 24.295442093           B3V 1 0
19 [RMH2014] 10a * 18 56 01.0736175664 +07 56 55.370559105           F7V 1 0
20 IRAS 18536+0753 mul 18 56 03.7 +07 57 26           ~ 17 0
21 2MASS J18560421+0757179 * 18 56 04.219 +07 57 17.91           B2-3V 1 0
22 2MASS J18560470+0757242 Y*O 18 56 04.710 +07 57 24.27           ~ 1 0
23 [RMH2014] 6a * 18 56 05.8890854206 +07 57 50.878433237           F6V 1 0
24 2MASS J18560659+0757120 * 18 56 06.594 +07 57 12.01           K0-2III 1 0
25 Masgomas-4 C?* 18 56 07.0 +07 56 07           ~ 2 0
26 [RMH2014] 2a * 18 56 08.3053349246 +08 00 14.400703449           B2-3V 1 0
27 [RMH2014] 4a * 18 56 09.5428045490 +07 58 08.327126042           B3-5V 1 0
28 V* V1665 Aql Al* 18 56 09.9030937419 +07 56 08.224568729   8.27 8.11     B9V 15 0
29 [HHG86] 185345.9+074916 Mas 18 56 10.7 +07 53 14           ~ 3 0
30 [RMH2014] 1b * 18 56 10.9670471506 +07 53 17.612181733           B3V 1 0
31 [RMH2014] 5a * 18 56 10.9998062296 +07 57 25.673461947           G4-7III 1 0
32 RAFGL 2284 IR 18 56 11.0 +07 53 28           ~ 24 0
33 [RMH2014] 1a * 18 56 11.0401935562 +07 59 31.121222493           B2-3V 1 0
34 [RMH2014] 2b * 18 56 11.9816870736 +07 53 38.161039081           O9-9.5V 1 0
35 [RMH2014] 3b * 18 56 11.9867223339 +07 53 48.059251947           B1V 1 0
36 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 32 0
37 [RMH2014] 8b * 18 56 13.2251570355 +07 56 04.725328934           A5III-V 1 0
38 [RMH2014] 5b * 18 56 13.6175139784 +07 53 55.574226718           F6-G1V 1 0
39 [RMH2014] 9b * 18 56 13.8615368695 +07 56 45.467430837           F3-7V 1 0
40 2MASS J18561410+0757564 * 18 56 14.108 +07 57 56.49           B0-5V 1 0
41 2MASS J18561493+0753307 * 18 56 14.935 +07 53 30.77           G2-3V 1 0
42 2MASS J18561621+0754467 * 18 56 16.219 +07 54 46.73           M0-1III 1 0
43 [RMH2014] 7b * 18 56 18.7870005744 +07 54 31.078077523           G8-K0V 1 0
44 LBN 040.46+02.46 HII 18 56.4 +07 48   12.16 11.66     ~ 22 0
45 HD 231033 * 19 16 30.9777475717 +13 07 59.661979441   9.91 9.69     A0 5 0
46 SH 2-88 B HII 19 46 47.329 +25 12 45.62           ~ 153 2
47 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 241 0
48 HD 193322 ** 20 18 06.98820 +40 43 55.5001 5.17 5.94 5.84 5.69 5.68 O9IV(n)+B1.5V 265 0
49 * eps Cyg ** 20 46 12.6823609 +33 58 12.924926 4.370 3.520 2.480 1.73 1.19 K0III 480 0
50 * iot Cep PM* 22 49 40.8169435 +66 12 01.463616 5.50 4.60 3.54 2.69 2.19 K0-III 233 0
51 SH 2-152 HII 22 58 40.862 +58 46 59.27           ~ 131 1
52 NGC 7538 OpC 23 13 37 +61 30.0           ~ 827 0
53 NAME Sct-Cen PoG ~ ~           ~ 135 0
54 NAME Galactic Bar reg ~ ~           ~ 894 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:59:14

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