2001A&A...378..455K


Query : 2001A&A...378..455K

2001A&A...378..455K - Astronomy and Astrophysics, volume 378, 455-465 (2001/11-1)

K413, a star near the AGB in the globular cluster M 12.

KLOCHKOVA V.G. and SAMUS N.N.

Abstract (from CDS):

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=4800K, logg=0.7) and detailed chemical abundances for the star K413, a member of the globular cluster M12. The resulting value, [Fe/H]=-1.38, is the first metallicity determination for M12 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 K413 shows, for the Hα line, an variable absorption and emission profile. From its high luminosity and chemical abundance anomalies, we can suppose that K413 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 16km/s to longer wavelengths relative to the star's velocity.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: M 12 - stars: abundances - stars: atmospheres - stars: AGB and post-AGB

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 - 2023
#notes
1 V* V382 Aur pA* 06 37 52.4269199856 +53 31 01.958446992   9.585 9.295 9.078   F7IV: 132 0
2 NGC 5139 256 RG* 13 25 53.7674977320 -47 28 12.181831032   13.481 12.251   10.97 ~ 28 0
3 2MASS J13261094-4725444 RG* 13 26 10.9370938224 -47 25 44.495248764   12.86 11.54     ~ 32 0
4 HD 116745 pA* 13 26 26.3183998296 -47 16 27.350366448   11.08 10.79     A7/9 69 0
5 NGC 5139 74 RG* 13 26 34.5299238720 -47 20 05.450209548   13.05 11.61     ~ 40 0
6 NGC 5139 91 RG* 13 26 46.1549480928 -47 14 15.191623860   13.232 11.800 11.437   ~ 36 0
7 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3361 0
8 BD+18 2890 HB* 14 32 13.4860470912 +17 25 24.289741704   10.49 9.73     ~ 65 0
9 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 657 0
10 NGC 6218 2251 * 16 47 25.9746809232 -02 01 03.392178564   13.81 12.83     ~ 9 0
11 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1348 0
12 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 409 0
13 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3102 0

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2023.09.23-17:31:35

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