2002MNRAS.331..785C

Query : 2002MNRAS.331..785C

2002MNRAS.331..785C - Mon. Not. R. Astron. Soc., 331, 785-794 (2002/April-2)

A photometric investigation of the young open cluster Trumpler 15.

CARRARO G.

Abstract (from CDS):

In this paper we present and analyse new CCD UBVRI photometry down to V ~21 in the region of the young open cluster Trumpler 15, located in the Carina spiral feature. The cluster is rather compact and has a core radius of about 2arcmin, which translates to about 1pc at the distance of the cluster. We provide the first CCD investigation and update its fundamental parameters. We identify 90 candidate photometric members on the base of the position in the colour-colour and colour-magnitude diagrams. This sample allows us to obtain a distance of 2.4±0.3kpc from the Sun and a reddening E (B -V)=0.52±0.07. We confirm that the cluster is young, and fix a upper limit of 6x106 yr to its age.

In addition, we draw attention to the lower part of the main sequence (MS) suggesting that some stars can be in contracting phase and on a gap in the MS, which we show to be a real feature, the B1-B5 gap found in other young open clusters.

We finally study in detail the extinction toward Trumpler 15 concluding that it is normal and suggesting a value of 2.89±0.19 for the ratio of total to selective absorption RV


Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): techniques: photometric - open clusters and associations: individual: Trumpler 15

Nomenclature: Table 2, col(1): Cl* Trumpler 15 C NN N=16 among 90.

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 3324 OpC 10 37 20.8 -58 37 26           ~ 145 1
2 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
3 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
4 CPD-58 2644 * 10 44 29.1007818144 -59 20 04.970283396 10.17 10.86 10.64 10.75   B1III 26 0
5 CPD-58 2647 SB* 10 44 30.7649602272 -59 21 26.067295872 10.88 11.38 11.12 11.26 10.687 B2III 27 0
6 Cl Trumpler 15 25 Y*O 10 44 32.6615007920 -59 20 38.505003322   12.96 12.73     B5V 14 0
7 Cl Trumpler 15 22 Y*? 10 44 34.9277618424 -59 22 20.827397280   13.53 13.17     B9 8 0
8 Cl Trumpler 15 19 Y*? 10 44 35.9168086776 -59 23 35.636100108   13.01 12.71     B2V 20 0
9 Cl Trumpler 15 18 * 10 44 36.3461573784 -59 24 20.440188252 12.3 12.39 11.28     B1Ia 21 0
10 Cl Trumpler 15 21 * 10 44 37.6624042152 -59 23 07.188686304   13.38 13.13     B1V: 16 0
11 Cl Collinder 232 OpC 10 44 39.00 -59 33 36.0           ~ 72 0
12 Cl Trumpler 15 4 Y*O 10 44 40.5815183736 -59 21 13.781611980 10.58 11.21 10.95 11.02   B1Vn 20 0
13 2MASS J10444178-5921329 Y*O 10 44 41.7821346000 -59 21 32.979616992 11.23 11.75 11.49 11.39   B5V 20 0
14 CPD-58 2655 Y*? 10 44 42.1293275376 -59 22 30.573769368 10.45 10.93 10.69 10.884   B1V 26 0
15 CPD-58 2656 * 10 44 42.3352767192 -59 23 03.847424676   10.29 10.05 10.15   B1V 32 0
16 Cl Trumpler 15 9 Y*? 10 44 42.3536401800 -59 22 02.975518920   12.94 12.59     B2V 20 0
17 CPD-58 2657 * 10 44 42.7572866304 -59 21 50.949886644 10.37 10.78 10.43 10.53   B2.5Vn 18 0
18 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
19 Cl Trumpler 15 2 Y*? 10 44 43.7535299928 -59 21 17.284005828 8.94 9.67 9.47     B0V 31 0
20 Cl Trumpler 15 3 * 10 44 44.4741372360 -59 21 32.808833280 10.21 10.86 10.570   10.20 B2Vn 20 0
21 CPD-58 2662 * 10 44 46.5219462024 -59 21 53.862517980   11.83 11.55     B2V 18 0
22 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
23 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
24 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
25 Cl Bochum 11 OpC 10 47 06.3 -60 05 55           ~ 95 0

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