2009A&A...508..289G


Query : 2009A&A...508..289G

2009A&A...508..289G - Astronomy and Astrophysics, volume 508, 289-295 (2009/12-2)

Li-rich red giant branch stars in the Galactic Bulge.

GONZALEZ O.A., ZOCCALI M., MONACO L., HILL V., CASSISI S., MINNITI D., RENZINI A., BARBUY B., ORTOLANI S. and GOMEZ A.

Abstract (from CDS):

We present lithium abundance determination for a sample of K giant stars in the Galactic bulge. The stars presented here are the only 13 stars with a detectable lithium line (6767.18Å) among ∼400 stars for which we have spectra in this wavelength range, half of them in Baade's Window (b=-4°) and half in a field at b=-6°. The stars were observed with the GIRAFFE spectrograph of FLAMES mounted on VLT, with a spectral resolution of R∼20000. Abundances were derived from spectral synthesis and the results are compared with those of stars with similar parameters, but no detectable Li line. We find 13 stars with a detectable Li line, among which 2 have abundances A(Li)>2.7. No clear correlations were found between the Li abundance and those of other elements. With the exception of the two most Li rich stars, the others follow a fairly tight A(Li)-Teff correlation. There is strong indication of a Li production phase during the red giant branch (RGB), acting either on a very short timescale, or selectively only in some stars. That the proposed Li production phase is associated with the RGB bump cannot be excluded, although our targets are significantly brighter than the predicted RGB bump magnitude for a population at 8kpc.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: late-type - Galaxy: bulge

CDS comments: In reflist, Monaco 2008, MmSAI, 79, 1 is a misprint for Monaco 2008MmSAI..79..524M.

Simbad objects: 21

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Number of rows : 21
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 NAME Sagittarius Stream St* 02 22 +00.0           ~ 826 0
2 NGC 2682 OpC 08 51 23.0 +11 48 50           ~ 2261 0
3 * mu. Leo PM* 09 52 45.8165435 +26 00 25.031882 6.50 5.10 3.88 2.97 2.39 K2IIIbCN1Ca1 439 0
4 2MASS J13415502+2819149 RG* 13 41 55.0321396248 +28 19 14.930940144   14.53 13.18     ~ 55 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2425 0
6 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2283 0
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13679 0
8 NAME Baade Window reg 18 03.5 -30 01           ~ 591 3
9 UCAC4 300-175366 * 18 03 51.8482129224 -30 06 28.428365088     16.42 15.39 14.430 K 13 0
10 UCAC4 301-181567 * 18 04 03.9685794552 -29 59 22.373934864     16.60 15.84 14.345 ~ 6 0
11 OGLE BUL-SC45 564768 * 18 04 05.9136346872 -29 59 53.639963520     16.59   14.404 ~ 3 0
12 2MASS J18041887-3000362 * 18 04 18.8617088640 -30 00 36.303900264     16.19   14.517 ~ 4 0
13 2MASS J18042418-3010358 * 18 04 24.2027894736 -30 10 35.814309960     16.36   14.660 ~ 4 0
14 OGLE BUL-SC45 231128 * 18 04 31.5263704848 -29 59 52.260681588     16.55   14.212 ~ 3 0
15 OGLE BUL-SC45 108191 * 18 09 45.5552851488 -31 45 44.618951700     15.90   14.446 ~ 4 0
16 2MASS J18100419-3150111 * 18 10 04.1545542072 -31 50 10.994615304     16.05   14.435 ~ 5 0
17 2MASS J18100916-3150263 * 18 10 09.1692938688 -31 50 26.339327808     16.03   14.139 ~ 5 0
18 OGLE BUL-SC45 69986 * 18 10 28.5702982200 -31 34 46.197471432     16.19   14.409 ~ 4 0
19 OGLE BUL-SC45 139560 * 18 10 45.1526303016 -31 41 57.972029712     16.42   14.380 ~ 4 0
20 NGC 7789 OpC 23 57 20.2 +56 43 34   7.68 6.7     ~ 507 0
21 NAME Galactic Bulge reg ~ ~           ~ 4096 0

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2023.06.04-16:16:44

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