2000A&A...360..509H


Query : 2000A&A...360..509H

2000A&A...360..509H - Astronomy and Astrophysics, volume 360, 509-519 (2000/8-2)

Chemical abundances in seven red giants of NGC 2360 and NGC 2447.

HAMDANI S., NORTH P., MOWLAVI N., RABOUD D. and MERMILLIOD J.-C.

Abstract (from CDS):

Chemical abundances of about fifteen elements from oxygen to europium are measured in seven red giants of the two open clusters NGC 2360 and NGC 2447. The effective temperatures of the giants are determined spectroscopically by taking advantage of their known masses (∼2M in NGC 2360 and ∼3M in NGC 2447) and bolometric magnitudes. The average iron abundances we obtain for the two clusters are [Fe/H]=0.07 for NGC 2360 and [Fe/H]=0.03 for NGC 2447. Evolutionary stellar model calculations are performed in the mass range 1-4M in order to analyze the surface Na and O abundances predicted after the first dredge-up. The sodium abundance shows a well defined correlation with stellar mass in the 2-3M range. The agreement between our Na abundance determinations in NGC 2360 and our model predictions at 2M is very good. In contrast, the overabundance in one of the three stars in NGC 2447 exceeds that predicted at 3M by ∼0.08dex, which is significant compared to the observational error bars. The effects of core overshooting, convection prescription, metallicity and nuclear reaction rates on the Na surface predictions of our models are investigated. An oxygen deficiency relative to iron by 0.2dex is measured in our stars, in disagreement with our model predictions. Assuming that the Sun is 0.1-0.3dex enriched in oxygen relative to neighbor stars could explain the discrepancy.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: evolution - stars: late-type - Galaxy: open clusters and associations: individual: NGC 2360 - Galaxy: open clusters and associations: individual: NGC 2447

VizieR on-line data: <Available at CDS (J/A+A/360/509): table3.dat>

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 - 2022
#notes
1 M 42 HII 05 35 17.3 -05 23 28           ~ 3900 0
2 NAME Ori A MoC 05 38 -07.1           ~ 2841 0
3 NGC 2360 62 SB* 07 17 23.9841164232 -15 33 27.078318072 12.81 12.23 11.29     ~ 15 0
4 HIP 35305 * 07 17 35.0707479696 -15 38 35.435230116 12.48 11.80 10.77     ~ 30 0
5 TYC 5965-749-1 * 07 17 43.0357213800 -15 37 32.158140672 12.83 12.10 11.09     ~ 22 0
6 NGC 2360 OpC 07 17 46 -15 37.9           ~ 178 0
7 HIP 35366 * 07 18 19.0082143896 -15 34 59.423559132 12.79 12.10 11.10     ~ 30 0
8 CPD-23 2745 * 07 44 25.7293012440 -23 49 52.987121184   11.05 10.16     ~ 24 0
9 CPD-23 2764 * 07 44 33.6559676712 -23 51 42.125907528   10.46 9.38     ~ 23 0
10 NGC 2447 OpC 07 44 34 -23 51.2           ~ 128 1
11 CD-23 6102 * 07 44 50.2512648336 -23 52 27.129050472   10.78 9.96     ~ 25 0
12 * G CMi PM* 08 02 15.9369212008 +02 20 04.458846354 6.91 5.63 4.38 3.39 2.72 K2IIIbFe-0.5: 177 1
13 HD 80170 * 09 16 57.0762015552 -39 24 05.536849500   6.473 5.304     K2III 68 0

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2022.05.23-16:36:51

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