2002A&A...388..179P


Query : 2002A&A...388..179P

2002A&A...388..179P - Astronomy and Astrophysics, volume 388, 179-188 (2002/6-2)

Two highly reddened young open clusters located beyond the Sagittarius arm.

PIATTI A.E. and CLARIA J.J.

Abstract (from CDS):

We present the results of CCD BVI Johnson-Cousins photometry down to V∼19mag in the regions of the unstudied stellar groups Pismis 23 and BH 222, both projected close to the direction towards the Galactic centre. We measured V magnitude and B-V and V-I colours for a total of 928 stars in fields of about 4'x4'. Pismis23 is conclusively a physical system, since a clear main sequence and other meaningful features can be seen in the colour-magnitude diagrams. The reality of this cluster is also supported by star counts carried out within and outside the cluster field. For Pismis23 we derive colour excesses E(B-V)=2.0±0.1 and E(V-I)=2.6±0.1, a distance from the Sun of 2.6±0.6kpc (Z=-19pc) and an age of 300±100Myr (assuming solar metal content). BH 222 appears to be a young open cluster formed by a vertical main sequence and by a conspicuous group of luminous, typically red supergiant stars. We derived for this cluster a colour excess of E(V-I)=2.4±0.2, a distance from the Sun of 6.0±2.7kpc (Z=-46pc) and an age of 60±30Myr. The resulting reddening and distance estimates place these two young objects among the most reddened and distant open clusters known in the direction towards the Galactic centre. They are located beyond the Sagittarius arm, close to the direction where this arm probably bifurcates into two arms.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Pismis 23, BH 222 - open clusters and associations: general - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/388/179): table2.dat table3.dat>

Nomenclature: Table 2: Cl* Pismis 23 PC NNN (Nos 1-627). Table 3: Cl* VDBH 222 PC NNN (Nos 1-301).

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

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Pismis 23 OpC 16 23 58 -48 53.5           ~ 19 0
2 NGC 6115 OpC 16 24 33 -51 55.9   10.29 9.8     ~ 22 0
3 NGC 6134 OpC 16 27 49 -49 09.7   7.89 7.2     ~ 138 0
4 Cl Ruprecht 119 OpC 16 28 09 -51 30.0           ~ 41 0
5 NGC 6167 OpC 16 34 39 -49 45.5   7.58 6.7     ~ 74 0
6 Cl Ruprecht 120 OpC 16 35 10 -48 18.0           ~ 20 0
7 NGC 6178 OpC 16 35 45 -45 38.1   7.28 7.2     ~ 62 0
8 NGC 6192 OpC 16 40 18 -43 21.3           ~ 75 0
9 NGC 6193 OpC 16 41 17 -48 46.6           ~ 141 0
10 NGC 6200 OpC 16 44.1 -47 28   7.74 7.4     ~ 40 0
11 NGC 6204 OpC 16 46 09 -47 01.6   8.51 8.2     ~ 119 0
12 Cl Hogg 22 OpC 16 46 34 -47 06.2           ~ 66 0
13 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 511 0
14 NGC 6216 OpC 16 49 20 -44 43.3     10.1     ~ 20 0
15 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 507 0
16 Cl Lynga 14 OpC 16 55 03 -45 14.3           ~ 42 0
17 NGC 6242 OpC 16 55 31 -39 28.4           ~ 76 0
18 Cl Trumpler 24 OpC 16 57 00 -40 40.0     8.6     ~ 68 0
19 NGC 6249 OpC 16 57 47 -44 48.9   8.72 8.2     ~ 46 0
20 NGC 6250 OpC 16 57 59 -45 57.1   6.14 5.9     ~ 75 0
21 NGC 6259 OpC 17 00 47 -44 40.7   8.85 8.0     ~ 67 0
22 NGC 6281 OpC 17 04 43 -37 56.9           ~ 116 0
23 NGC 6318 OpC 17 16 11 -39 25.4     11.8     ~ 25 1
24 Cl Bochum 13 OpC 17 17 20 -35 31.7   7.84 7.2     ~ 55 0
25 Cl VDBH 222 OpC 17 18 47 -38 17.3           ~ 24 0
26 Cl HM 1 OpC 17 19 00 -38 49.0           ~ 45 0
27 GRS G349.80 -00.50 HII 17 21.2 -38 12           ~ 7 0
28 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
29 NAME Sgr Arm PoG 19 00 -30.0           ~ 592 1

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2022.08.15-14:44:58

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