Chemical composition of evolved stars in the open cluster NGC 2506

Abstract

In this study we present abundances of 12^C, 13^C, N, O and up to 26 other chemical elements in two first ascent giants and two core-helium-burning 'clump' stars of the open cluster NGC 2506. Abundances of carbon were derived using the C_2 Swan (0,1) band head at 5635.5 A. The wavelength interval 7940-8130 A, with strong CN features, was analysed in order to determine nitrogen abundances and carbon isotope ratios. The oxygen abundances were determined from the [O I] line at 6300 A. NGC 2506 was found to have a mean [Fe/H]=-0.24 +- 0.05 (standard deviation). Compared with the Sun and other dwarf stars of the Galactic disc, mean abundances in the investigated clump stars suggest that carbon is depleted by about 0.2 dex, nitrogen is overabundant by about 0.3 dex and other chemical elements have abundance ratios close to solar. The C/N and 12^C/13^C ratios are lowered to 1.25 +- 0.27 and 11 +- 3, respectively.

MNRAS accepted

References in corpus (3)

• The chemical abundance of the very metal rich old Open Clusters NGC 6253 and NGC 6791
• First full evolutionary computation of the He-flash induced mixing in Population II stars
• Chemical composition of evolved stars in the open cluster IC 4651

Cited by in corpus (24)

• Chemical abundance analysis of the Open Clusters Berkeley 32, NGC 752, Hyades and Praesepe
• On the metallicity of open clusters II. Spectroscopy
• Post first dredge-up [C/N] ratio as age indicator. Theoretical calibration
• The Gaia-ESO survey: impact of extra-mixing on C- and N-abundances of giant stars
• The Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and NGC 6705
• O, Na, Ba and Eu abundance patterns in open clusters
• C, N, O abundances and carbon isotope ratios in evolved stars of the open clusters Collinder 261 and NGC 6253
• Chemical analysis of giant stars in the young open cluster NGC 3114
• WIYN Open Cluster Study, LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-Deficient Open Cluster, NGC 2506
• The Puzzling Li-rich Red Giant Associated with NGC 6819
• The Chemical Compositions and Evolutionary Status of Red Giants in the Open Cluster NGC 752
• Red clump stars of the Milky Way - laboratories of extra-mixing
• The extent of mixing in stellar interiors: the open clusters Collinder 261 and Melotte 66
• 12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791
• CNO abundances and carbon isotope ratios in evolved stars of the open clusters NGC 2324, NGC 2477, and NGC 3960
• WIYN Open Cluster Study. LXXII. A uvbyCa Hbeta CCD Analysis of the Metal-Deficient Open Cluster, NGC 2506
• The chemical compositions and evolutionary status of red giants in the open cluster NGC 6940
• Fitting isochrones to open cluster photometric data III. Estimating metallicities from UBV photometry
• Photometric and spectroscopic study of the intermediate-age open cluster NGC 2355
• Chemical composition of evolved stars in the young open clusters NGC 4609 and NGC 5316
• New determination of abundances and stellar parameters for a set of weak G-band stars
• Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries
• Chemical composition of giant stars in the open cluster IC 4756
• Lithium Inventory of 2 $M_{\odot }$ Red Clump Stars in Open Clusters: A Test of the Helium Flash Mechanism