K 413, a star near the AGB in the globular cluster M 12

Details K 413, a star near the AGB in the globular cluster M 12 K 413, a star near the AGB in the globular cluster M 12

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..455k&link_type=abstract

Astronomy and Astrophysics, v.378, p.455-465 (2001)

Astronomy and Astrophysics

Astrophysics

6

Globular Clusters: General, Globular Clusters: Individual M 12, Stars: Abundances, Stars: Atmospheres, Stars: Agb And Post-Agb

Scientific paper

CCD spectra obtained with the echelle spectrometer of the 6-meter telescope were used to determine, by the model atmospheres method, the fundamental parameters ( Teff = 4800 K, log g = 0.7) and detailed chemical abundances for the star K 413, a member of the globular cluster M 12. The resulting value, [Fe/H] = -1.38, is the first metallicity determination for M 12 using high-resolution spectra. The main characteristic feature of the star's atmospheric chemical abundance pattern is a large oxygen excess, [O/Fe] ~ +2. The s-process elements are probably slightly depleted compared to metallicity: [X/Fe] = -0.04 for yttrium and zirconium, [Ba/Fe] = -0.12 for barium. Abundances of the heavier elements: La, Ce, Nd, and Pr, do not differ, relative to iron, from the solar ones: [heavy/Fe] = 0.0. The europium excess, [Eu/Fe] = +0.48, is typical of members of low-metallicity globular clusters. The spectrum of K 413 shows, for the Hα line, an variable absorption and emission profile. From its high luminosity and chemical abundance anomalies, we can suppose that K 413 is in an evolutionary stage after the AGB. In the spectrum, we find absorption details that can be identified with diffuse interstellar bands displaced by 16 km s-1 to longer wavelengths relative to the star's velocity.

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