2002A&A...390..931O


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:22:23

2002A&A...390..931O - Astronomy and Astrophysics, volume 390, 931-935 (2002/8-2)

The very reddened open clusters Pismis 23 (Lynga 10) and Stephenson 2.

ORTOLANI S., BICA E., BARBUY B. and MOMANY Y.

Abstract (from CDS):

Pismis 23 and Stephenson 2 are two very reddened open clusters, projected close to the Galactic plane. We present VI and JH photometry for Pismis 23 and I and Gunn z for Stephenson 2. We derive a relatively old age of ∼700Myr for Pismis 23, with a reddening value of E(B-V)=1.73 and a distance d≃2.6kpc from the Sun. Stephenson 2 has a clump of red supergiants, indicating a young age of about 20Myr, somewhat younger and more distant (d≃6kpc) than recently reported in the literature. The age estimate for such a young object is crucial for the distance estimate. The high reddening of these two clusters relative to predictions from the diffuse interstellar medium at their distances is due to discrete intervening clouds.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Pismis 23, Stephenson 2 - stars: Hertzsprung-Russell (HR) and C-M diagrams

VizieR on-line data: <Available at CDS (J/A+A/390/931): pismis23.dat stephen2.dat>

Nomenclature: Table 2: Cl* Pismis 23 OBB NNNN (Nos 1-5426). Table 3: Cl* Stephenson 2 OBB NNNN (Nos 1-2687).

Status in Simbad:  will not be processed

Simbad objects: 13

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Number of rows : 13

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 NGC 884 OpC 02 22 23 +57 07.5           ~ 443 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14539 1
3 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 257 0
4 NGC 3766 OpC 11 36 18 -61 36.9   5.66 5.3     ~ 179 0
5 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 417 1
6 NAME Nor Arm PoG 16 00 -50.0           ~ 330 0
7 [DB2002b] G334.68+0.56 DNe 16 23.4 -48 47           ~ 3 0
8 Cl Pismis 23 OpC 16 23 58 -48 53.5           ~ 16 0
9 [DB2002b] G335.07+0.16 DNe 16 26 51 -48 46.9           ~ 6 0
10 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 453 0
11 LDN 515 DNe 18 37.7 -04 57           ~ 3 0
12 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 81 0
13 NAME Nor-Sct Arm reg ~ ~           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:22:23

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