2015MNRAS.446.3562B -
Mon. Not. R. Astron. Soc., 446, 3562-3578 (2015/February-1)
The chemical compositions and evolutionary status of red giants in the open cluster NGC 752.
BOCEK TOPCU G., AFSAR M., SCHAEUBLE M. and SNEDEN C.
Abstract (from CDS):
We present detailed chemical compositions of 10 red giant star members of the Galactic (open) cluster NGC 752, derived from high-resolution (R ~ 60 000), high signal-to-noise (S/N ≥ 140) spectra. We confirmed cluster memberships by measuring the stellar radial velocities, and by deriving model atmosphere parameters (Teff, log g, [Fe/H] and ξt) from equivalent widths of Fei, Feii, Tii, and Tiii lines. The metallicity we obtained for NGC 752 ([Fe/H] = -0.02±0.05) is in good agreement with previous studies. We derived abundances of α (Mg, Si, Ca), light odd-Z (Na, Al), Fe-group (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn), n-capture (Y, La, Nd, Eu), and p-capture (Li, C, N, O) species for each star. Furthermore, we also derived abundances of the LiCNO p-capture element group and carbon isotopic ratios, using synthetic spectrum analyses of the Lii 6707 Å resonance doublet, the [Oi] line at 6300 Å, the CH G-band features near 4311 and 4325 Å, the C2 bandheads at 5160 and 5631 Å, and 12,13CN red system lines in the 7995-8040 Å region. By applying recent isochrones to NGC 752 photometry, and comparing the colour-magnitude diagram information to our Li abundances and 12C/13C ratios, we suggest that the 10 observed red giants can be separated into three first-ascent, six red-clump and one red horizontal branch star.
Abstract Copyright:
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
Journal keyword(s):
stars: abundances - stars: atmosphere - stars: evolution - open clusters and associations: individual: NGC 752
VizieR on-line data:
<Available at CDS (J/MNRAS/446/3562): stars.dat table4.dat table5.dat table10.dat>
Simbad objects:
16
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