2012A&A...541A.137M

Query : 2012A&A...541A.137M

2012A&A...541A.137M - Astronomy and Astrophysics, volume 541A, 137-137 (2012/5-1)

C, N, O abundances and carbon isotope ratios in evolved stars of the open clusters Collinder 261 and NGC 6253.

MIKOLAITIS S., TAUTVAISIENE G., GRATTON R., BRAGAGLIA A. and CARRETTA E.

Abstract (from CDS):

Investigations of abundances of carbon and nitrogen in the atmospheres of evolved stars of open clusters may provide comprehensive information on chemical composition changes caused by stellar evolution. Our main aim is to increase the number of open clusters with determined carbon-to nitrogen and carbon isotope ratios. High-resolution spectra were analysed using a differential model atmosphere method. Abundances of carbon were derived using the C2 Swan (0, 1) band head at 5635.5Å (FEROS spectra) and the C2 Swan (1, 0) band head at 4737Å (UVES spectra). The wavelength interval 7980-8130Å, with strong CN features was analysed to determine nitrogen abundances and 12C/13C isotope ratios. The oxygen abundances were determined from the [Oi] line at 6300Å. The average value of 12C/13C isotope ratios of Cr261 is equal to 18±2 in four giants and to 12±1 in two clump stars; it is equal to 16±1 in four clump stars of the open cluster NGC6253. The mean C/N ratios in Cr261 and NGC6253 are equal to 1.67±0.06 and 1.37±0.09, respectively. The 12C/13C and C/N values in Cr261 and NGC6253 within limits of uncertainties agree with the theoretical model of thermohaline-induced mixing as well as with the cool-bottom processing model.

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Journal keyword(s): stars: abundances - stars: horizontal-branch - open clusters and associations: individual: collinder 261 - open clusters and associations: individual: NGC 6253

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 2506 OpC 08 00 02.4 -10 46 23   8.28 7.6     ~ 276 0
2 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1564 0
3 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2342 0
4 Cl* Collinder 261 SBR 2 * 12 37 34.6668240312 -68 23 25.400484528   14.384 12.937   11.345 ~ 20 0
5 Cl* Collinder 261 PJM 2001 * 12 37 38.5360955160 -68 20 26.292070356   15.288 13.932   12.562 ~ 16 0
6 Cl* Collinder 261 PJM 1871 * 12 37 43.4661608256 -68 19 55.449573996   14.41 12.350   10.51 ~ 17 0
7 Cl* Collinder 261 PJM 1485 * 12 37 55.4165059224 -68 20 14.642262060   15.257 13.68   12.08 ~ 16 0
8 Cl Collinder 261 OpC 12 38 04.6 -68 22 37     10.7     ~ 192 0
9 Cl* Collinder 261 PJM 1080 * 12 38 07.2702295824 -68 22 31.010100492   15.387 13.952   12.472 ~ 22 0
10 Cl* Collinder 261 PJM 1045 * 12 38 08.3563836912 -68 21 15.217054596   15.034 13.547   12.017 ~ 18 0
11 [TGB2011] J165853.3353-524154.093 RG* 16 58 53.3309943528 -52 41 54.080648052   13.918 12.629 11.908 11.211 ~ 21 0
12 [TGB2011] J165905.8498-524104.444 RG* 16 59 05.8492921824 -52 41 04.401528864   13.612 12.360 11.666 10.998 ~ 19 0
13 [TGB2011] J165906.1059-523955.921 RG* 16 59 06.1033521072 -52 39 55.834479540   13.981 12.713 12.000 11.317 ~ 20 0
14 NGC 6253 OpC 16 59 06.7 -52 42 43     10.2     ~ 186 0
15 [TGB2011] J165915.9518-524226.200 RB? 16 59 15.9498335592 -52 42 26.171012628   13.923 12.664 11.977 11.275 ~ 17 0
16 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14415 0
17 NGC 6791 OpC 19 20 53.0 +37 46 41   10.52 9.5     ~ 1040 0

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