2011A&A...529A..90M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:05:11

2011A&A...529A..90M - Astronomy and Astrophysics, volume 529A, 90-90 (2011/5-1)

Lithium-rich giants in the Galactic thick disk.

MONACO L., VILLANOVA S., MONI BIDIN C., CARRARO G., GEISLER D., BONIFACIO P., GONZALEZ O.A., ZOCCALI M. and JILKOVA L.

Abstract (from CDS):

Lithium is a fragile element, which is easily destroyed in the stellar interior. The existence of lithium-rich giants still represents a challenge for stellar evolution models. We have collected a large database of high-resolution stellar spectra of 824 candidate thick-disk giants having 2MASS photometry and proper motions measured by the Southern Proper-Motion Program (SPM). In order to investigate the nature of Li-rich giants, we searched this database for giants presenting a strong LiI resonance line. We performed a chemical abundance analysis on the selected stars with the MOOG code along with proper ATLAS-9 model atmospheres. The iron content and atmospheric parameters were fixed by using the equivalent width of a sample of Fe lines. We also derive abundances for C, N, and O and measure or derive lower limits on the 12C/13C isotopic ratios, which is a sensible diagnostic of the stars evolutionary status. We detected five stars with a lithium abundance higher than 1.5, i.e. Li-rich according to the current definition. One of them (SPM-313132) has A(Li)>3.3 and, because of this, belongs to the group of the rare super Li-rich giants. Its kinematics makes it a likely thin-disk member and its atmospheric parameters are compatible with it being a 4M star either on the red giant branch (RGB) or the early asymptotic giant branch. This object is the first super Li-rich giant detected at this phase. The other four are likely low-mass thick-disk stars evolved past the RGB luminosity bump, as determined from their metallicities and atmospheric parameters. The most evolved of them lies close to the RGB-tip. It has A(Li)>2.7 and a low 12C/13C isotopic ratio, close to the cool bottom processing predictions.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: chemically peculiar - Galaxy: disk

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 787 PM* 00 12 09.9850054049 -17 56 17.699314201   6.740 5.265     K4III 85 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
3 UCAC2 15192535 * 00 32 12.5627046534 -38 34 02.339920034   13.227 12.068   10.85 ~ 5 0
4 TYC 6998-300-1 * 00 39 20.2373005104 -31 31 35.510222393   13.23 11.40     ~ 4 0
5 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 498 0
6 UCAC2 20298234 * 00 54 46.3917611117 -27 35 30.376145189   13.515 12.133 11.856 10.68 ~ 6 0
7 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 938 0
8 CD-34 510 * 01 20 20.6623529833 -34 09 54.167092729   10.89 9.69   8.94 K0 4 0
9 TYC 7002-1425-1 HV* 01 29 42.0092546128 -30 15 46.415419982   11.94 10.68     ~ 6 0
10 HD 15453 * 02 29 35.3581217979 +09 33 56.261633640   7.164 6.111     K2III 30 0
11 HD 232862 ** 03 57 19.967736 +50 51 18.56412   10.47 9.58 9.36   K2V 26 0
12 * 2 Aur * 04 52 37.9809748976 +36 42 11.478901229   6.164 4.779     K3-IIIBa0.4 131 0
13 * pi.06 Ori V* 04 58 32.9027551398 +01 42 50.478494990   5.853 4.459     K2-IIb 121 0
14 HD 77361 PM* 09 01 11.4196224914 -26 39 49.374710790 8.49 7.352 6.187     K1IIICNII 23 0
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2265 0
16 * 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 2131 0
17 HD 148293 * 16 21 48.7120773476 +69 06 33.808720827   6.376 5.264     K2III 69 0
18 * d Sgr * 19 17 38.0790601386 -18 57 10.462632446   5.895 4.878     G8II-III 75 0
19 HD 183492 PM* 19 29 22.1538633324 +14 35 45.661565296   6.618 5.564     K0III 56 0
20 NAME Galactic Bulge reg ~ ~           ~ 3387 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:05:11

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