2011A&A...535A...8R


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.18CET15:24:16

2011A&A...535A...8R - Astronomy and Astrophysics, volume 535A, 8-8 (2011/11-1)

Near-infrared study of the stellar population of Sh 2-152.

RAMIREZ ALEGRIA S., HERRERO A., MARIN-FRANCH A., PUGA E., NAJARRO F., ACOSTA PULIDO J.A., HIDALGO S.L. and SIMON-DIAZ S.

Abstract (from CDS):

The discovery of new massive star clusters and massive stellar populations in previously known clusters in our Galaxy by means of infrared studies has changed our view of the Milky Way from an inactive to an active star-forming machine. Within this scenario, we present a near-infrared spectrophotometric study of the stellar content of the compact HII region Sh2-152. We aim to determine the distance, extinction, age, and mass of Sh2-152, using for the first time near-infrared stellar classification for several sources in the region. Using our near-infrared (J, H, and KS) photometry and the colour-magnitude diagram for the cluster field, we selected 13 bright stars, candidate members of the reddened cluster's main sequence, for H- and K-spectroscopy and spectral classification. This near-infrared information was complemented with an optical spectrum of the ionizing central star to confirm its spectral nature. From the 13 spectroscopically observed stars, 5 were classified as B-type, 3 as G-type, 2 were young stellar objects (YSOs), and 3 remained unclassified (because of the poor data quality). The cluster's extinction varies from AKS=0.5 to 2.6mag (AV=4.5 to 24mag) and the distance is estimated to be 3.21±0.21kpc. The age of the cluster is younger than 9.4Myr and the lower limit to the total mass of the cluster is (2.45±0.79)x103M. We compare the number of ionizing photons emitted from the OB-type stars with the Lyman continuum photons derived from the radio observations and conclude that both quantities are consistent for the central region of Sh2-152. In contrast, the main ionizing source of the lower region remains unidentified.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: luminosity function, mass function - Hertzsprung-Russell and C-M diagrams - infrared: stars - stars: early-type - open clusters and associations: individual: Sh2-152

Nomenclature: Table 2: [RHM2011] NN (Nos 1-13).

Simbad objects: 32

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Number of rows : 32

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 NAME Per Arm PoG 03 30 +45.0           ~ 1210 0
2 * 61 UMa PM* 11 41 03.0159358291 +34 12 05.882438337 6.31 6.08 5.34 4.73 4.38 G8V 561 0
3 * 61 Vir PM* 13 18 24.3142756 -18 18 40.304648 5.710 5.440 4.740     G6.5V 587 1
4 * bet Lib PM* 15 17 00.41382 -09 22 58.4919 2.14 2.51 2.62 2.67 2.76 B8Vn 257 0
5 * ome Ser PM* 15 50 17.5464926986 +02 11 47.439052415   6.236 5.217     K0IV 115 1
6 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 446 0
7 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 433 0
8 Cl Alicante 8 OpC 18 34 51.0 -07 14 00           ~ 21 0
9 RSGC 1 OpC 18 37 58 -06 53.0           ~ 84 0
10 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 80 0
11 RSGC 3 OpC 18 45 20.0 -03 24 43           ~ 45 0
12 * kap Cyg PM* 19 17 06.1686516 +53 22 06.453375 5.47 4.73 3.76 3.13 2.66 G9III 194 0
13 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 767 0
14 HD 207636 * 21 47 00.8500914577 +70 09 03.174840455 6.420 6.440 6.450     A0V 30 0
15 [RHM2011] 10 * 22 58 40.4397448220 +58 47 06.075875367           B5V 2 0
16 SH 2-152 HII 22 58 40.862 +58 46 59.27           ~ 130 1
17 [RHM2011] 9 * 22 58 41.479 +58 46 59.76           ~ 1 0
18 [RHM2011] 7 * 22 58 41.8886926945 +58 46 45.933923468           ~ 1 0
19 [RHM2011] 3 * 22 58 42.1975460765 +58 45 32.991146377           B2-3V 2 0
20 [RHM2011] 4 * 22 58 42.2188398908 +58 45 45.859255470           B2-3V 2 0
21 [RHM2011] 8 Y*O 22 58 42.2312703181 +58 46 56.525838970           ~ 1 0
22 NAME SH 2-152 SE * 22 58 42.6 +58 47 45           ~ 50 1
23 [RHM2011] 11 * 22 58 42.9149330619 +58 47 26.860965335           G6.5V 2 0
24 [RHM2011] 13 * 22 58 43.0668523229 +58 48 36.191174447           G8-9III 2 0
25 [RHM2011] 6 * 22 58 43.7878882126 +58 46 40.689663052           ~ 1 0
26 2MASS J22584601+5845264 Y*O 22 58 46.0117217072 +58 45 26.398481120           ~ 1 0
27 [RHM2011] 5 * 22 58 47.0807887273 +58 46 20.139482762           B2V 2 0
28 IRAS 22566+5828 * 22 58 47.66 +58 45 00.7           ~ 11 0
29 [RHM2011] 12 * 22 58 48.0516632074 +58 48 00.224633433           G8V 2 0
30 [RHM2011] 1 * 22 58 48.786 +58 44 53.86           B1V 2 0
31 HD 218066 Be* 23 04 02.2015433256 +63 23 48.645418835 7.50 7.97 7.6     B1.5Vn 259 0
32 HD 223386 PM* 23 48 53.9576553953 +59 58 44.171694257   6.311 6.324     A0V 50 0

    Equat.    Gal    SGal    Ecl

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2020.01.18-15:24:16

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