2014A&A...567A..73M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:48:34

2014A&A...567A..73M - Astronomy and Astrophysics, volume 567A, 73-73 (2014/7-1)

VdBH 222: a starburst cluster in the inner Milky Way.

MARCO A., NEGUERUELA I., GONZALEZ-FERNANDEZ C., MAIZ-APELLANIZ J., DORDA R. and CLARK J.S.

Abstract (from CDS):

It has been suggested that the compact open cluster VdBH 222 is a young massive distant object. We set out to characterise VdBH 222 using a comprehensive set of multi-wavelength observations. We obtained multi-band optical (UBVR) and near-infrared (JHKS) photometry of the cluster field, as well as multi-object and long-slit optical spectroscopy for a large sample of stars in the field. We applied classical photometric analysis, as well as more sophisticated methods using the CHORIZOS code, to determine the reddening to the cluster. We then plotted dereddened HR diagrams and determined cluster parameters via isochrone fitting. We have identified a large population of luminous supergiants confirmed as cluster members via radial velocity measurements. We find nine red supergiants (plus one other candidate) and two yellow supergiants. We also identify a large population of OB stars. Ten of them are bright enough to be blue supergiants. The cluster lies behind ≃7.5mag of extinction for the preferred value of RV=2.9. Isochrone fitting allows for a narrow range of ages between 12 and 16Ma. The cluster radial velocity is compatible with distances of ∼6 and ∼10kpc. The shorter distance is inconsistent with the age range and Galactic structure. The longer distance implies an age ≃12Ma and a location not far from the position where some Galactic models place the far end of the Galactic bar. VdBH 222 is a young massive cluster with a likely mass >20000M. Its population of massive evolved stars is comparable to that of large associations, such as Per OB1. Its location in the inner Galaxy, presumably close to the end of the Galactic bar, adds to the increasing evidence for vigorous star formation in the inner regions of the Milky Way.

Abstract Copyright:

Journal keyword(s): Hertzsprung-Russell and C-M diagrams - stars: evolution - stars: early-type - supergiants - techniques: photometric - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/567/A73): table4.dat table5.dat table7.dat table8.dat>

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 30

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Number of rows : 30

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 13891 * 02 17 09.8763869118 +54 52 42.634945448   8.86 8.66     A0 5 0
2 NGC 869 OpC 02 19 00 +57 07.7           ~ 426 0
3 NAME NGC 869/884 OpC 02 20.5 +57 08           ~ 51 0
4 Ass Per OB 1 As* 02 21 +57.6           ~ 160 1
5 NGC 884 OpC 02 22 23 +57 07.5           ~ 445 0
6 HD 18391 s*y 02 59 48.7224844706 +57 39 47.671063257 10.56 8.83 6.89     G5Ia-Ib 96 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
8 NAME Per Arm PoG 03 30 +45.0           ~ 1247 0
9 * 119 Tau s*r 05 32 12.7525072 +18 35 39.243589 8.63 6.41 4.33 2.55 1.13 M2Iab-Ib 259 0
10 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1464 0
11 V* AD CMi dS* 07 52 47.1851318636 +01 35 50.475222928   9.66 9.38     F0IV/V 135 0
12 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 275 0
13 HD 119796 ** 13 47 10.86726 -62 35 22.9574 10.24 9.05 6.80 4.74 3.54 G8Ia++B0Ibp: 118 0
14 NAME Nor Arm PoG 16 00 -50.0           ~ 338 0
15 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 16 0
16 GAL 338.4+00.1 HII 16 40 49.2 -46 24 05           ~ 18 0
17 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 463 0
18 VVV CL086 OpC 16 48 15 -45 26.1           ~ 9 0
19 Cl VDBH 222 OpC 17 18 45 -38 17.7           ~ 18 0
20 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
21 RSGC 1 OpC 18 37 58 -06 53.0           ~ 86 0
22 IRAS 18357-0604 IR 18 38 23.4057310368 -06 01 26.770155662           ~ 9 0
23 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 82 0
24 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 46 0
25 HD 191010 V* 20 06 45.8405801509 +25 41 06.789051121   9.13 8.17     G3Ib 38 0
26 NGC 7419 OpC 22 54 20 +60 48.9     13.0     ~ 85 0
27 V* V509 Cas LP* 23 00 05.1007915562 +56 56 43.348681058 8.01 6.68 5.13 3.96 3.11 G4_0 311 0
28 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 360 0
29 NAME Scutum Spiral Arm PoG ~ ~           ~ 275 0
30 NAME Galactic Bar reg ~ ~           ~ 892 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:48:34

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