2016ApJ...819..135K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:39:39

2016ApJ...819..135K - Astrophys. J., 819, 135 (2016/March-2)

Lithium-rich giants in globular clusters.

KIRBY E.N., GUHATHAKURTA P., ZHANG A.J., HONG J., GUO M., GUO R., COHEN J.G. and CUNHA K.

Abstract (from CDS):

Although red giants deplete lithium on their surfaces, some giants are Li-rich. Intermediate-mass asymptotic giant branch (AGB) stars can generate Li through the Cameron-Fowler conveyor, but the existence of Li-rich, low-mass red giant branch (RGB) stars is puzzling. Globular clusters are the best sites to examine this phenomenon because it is straightforward to determine membership in the cluster and to identify the evolutionary state of each star. In 72 hours of Keck/DEIMOS exposures in 25 clusters, we found four Li-rich RGB and two Li-rich AGB stars. There were 1696 RGB and 125 AGB stars with measurements or upper limits consistent with normal abundances of Li. Hence, the frequency of Li-richness in globular clusters is (0.2±0.1)% for the RGB, (1.6±1.1)% for the AGB, and (0.3±0.1)% for all giants. Because the Li-rich RGB stars are on the lower RGB, Li self-generation mechanisms proposed to occur at the luminosity function bump or He core flash cannot explain these four lower RGB stars. We propose the following origin for Li enrichment: (1) All luminous giants experience a brief phase of Li enrichment at the He core flash. (2) All post-RGB stars with binary companions on the lower RGB will engage in mass transfer. This scenario predicts that 0.1% of lower RGB stars will appear Li-rich due to mass transfer from a recently Li-enhanced companion. This frequency is at the lower end of our confidence interval.

Abstract Copyright:

Journal keyword(s): globular clusters: general - stars: abundances - stars: chemically peculiar - stars: evolution

VizieR on-line data: <Available at CDS (J/ApJ/819/135): table1.dat table2.dat table3.dat table4.dat>

Status at CDS : Examining the need for a new acronym. // Associated data (images, light curves, etc...) being ingested in VizieR. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 34

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Number of rows : 34

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 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 931 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 945 0
3 Cl Pal 2 GlC 04 46 05.91 +31 22 53.4   15       ~ 147 0
4 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 722 0
5 C 0634+094 OpC 06 36 29 +09 28.2     10.9     ~ 76 0
6 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 822 0
7 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 886 0
8 Cl* NGC 4590 HAR 1257 * 12 39 33.4584471389 -26 43 13.527986070   14.31 13.21     ~ 8 0
9 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 722 0
10 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 542 0
11 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3032 0
12 2MASS J13415502+2819149 RG* 13 41 55.0320949688 +28 19 14.932745077   14.53 13.18     ~ 50 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2277 0
14 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 249 0
15 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 341 0
16 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1782 0
17 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 330 0
18 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1685 0
19 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2016 0
20 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 315 0
21 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1916 0
22 NGC 6405 OpC 17 40 20 -32 15.2           ~ 168 0
23 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1808 1
24 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1227 0
25 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 364 0
26 NGC 6819 OpC 19 41 18 +40 11.2   8.21 7.3     ~ 474 0
27 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1028 0
28 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 316 0
29 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 486 0
30 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2922 0
31 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 906 1
32 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 925 0
33 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 234 1
34 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 258 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:39:39

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