2002A&A...383..491T

Query : 2002A&A...383..491T

2002A&A...383..491T - Astronomy and Astrophysics, volume 383, 491-501 (2002/2-4)

Accretion of gas by globular cluster stars.

THOUL A., JORISSEN A., GORIELY S., JEHIN E., MAGAIN P., NOELS A. and PARMENTIER G.

Abstract (from CDS):

Some recent observations of the abundances of s-process, r-process, and α elements in metal-poor stars have led to a new scenario for their formation. According to this scenario, these stars were born in a globular cluster and accreted the s-process enriched gas expelled by cluster stars of higher-mass, thereby modifying their surface abundances. Later on, these polluted stars evaporated from the globular cluster to constitute an important fraction of the current halo population. In addition, there are now many direct observations of abundance anomalies not only in globular cluster giant stars but also in subgiant and main-sequence stars. Accretion again provides a plausible explanation for (at least some of) these peculiarities. Here we investigate further the efficiency of the accretion scenario. We find that in concentrated clusters with large escape velocities, accretion is very efficient and can indeed lead to major modifications of the stellar surface abundances.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: globular clusters: general - stars: abundances - stars: chemically peculiar - stars: AGB and post-AGB

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3912 0
2 NGC 5139 287 RG* 13 25 26.0674548528 -47 27 11.996766000 14.94 13.81 12.39     ~ 33 0
3 AP J13254633-4725595 RB? 13 25 46.3328043792 -47 25 59.677976460   14.45 12.74   10.874 S 20 0
4 NGC 5139 332 RG* 13 26 00.1772642016 -47 33 51.379981920 15.62 14.070 12.563   11.189 ~ 13 0
5 NGC 5139 270 RG* 13 26 00.4100199432 -47 34 30.845140500 15.29 13.84 12.55   10.907 ~ 31 0
6 SOPS IV e-94 C* 13 26 01.5892714032 -47 33 05.967491724   13.18 11.44   9.966 C1,3p 54 0
7 2MASS J13260392-4726537 RG* 13 26 03.9188610144 -47 26 53.646468036 16.08 14.310 12.946     ~ 19 0
8 NGC 5139 243 RG* 13 26 04.3785491112 -47 25 00.924967128   13.598 12.107   10.714 ~ 15 0
9 NGC 5139 320 RG* 13 26 05.3594650032 -47 28 20.646778584 16.127 14.08 12.43 11.390 10.257 S 36 0
10 2MASS J13261120-4728435 RG* 13 26 11.2122788208 -47 28 43.621679532   13.98 12.50     ~ 30 0
11 NGC 5139 231 RG* 13 26 12.2030173224 -47 31 25.191967872 15.82 13.820 12.309   10.679 ~ 33 0
12 NGC 5139 577 RG* 13 26 14.4219122928 -47 28 05.373261048   14.510 13.336   11.824 ~ 17 0
13 NGC 5139 201 RG* 13 26 24.9957849312 -47 27 06.449465988   13.961 12.262     S 30 0
14 NGC 5139 513 * 13 26 28.8186051816 -47 25 23.503238364   14.570 12.900   11.005 S 25 0
15 2MASS J13262921-4731092 RG* 13 26 29.2177769400 -47 31 09.238524528   14.311 12.443   10.889 S 23 0
16 2MASS J13263483-4734110 RG* 13 26 34.8426950352 -47 34 11.125321320 16.056 14.039 12.249 11.306 10.498 ~ 32 0
17 NGC 5139 286 RB? 13 26 38.1827478768 -47 32 50.401310604   13.945 12.551   11.084 ~ 9 0
18 NGC 5139 480 RB? 13 26 47.2375070808 -47 34 12.317843964   14.196 12.923   11.655 ~ 23 0
19 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3423 0
20 2MASS J13264822-4732412 RG* 13 26 48.2363883192 -47 32 41.324663976   14.278 12.874   11.471 ~ 13 0
21 2MASS J13265071-4737010 RG* 13 26 50.7174210264 -47 37 01.158926736   14.28 12.71   11.159 K5 48 0
22 2MASS J13265076-4733038 RG* 13 26 50.7729103008 -47 33 03.857447520   13.83 12.31   11.037 ~ 18 0
23 NGC 5139 321 RB? 13 27 17.0221641240 -47 29 06.087168024   13.962 12.559     ~ 9 0
24 NGC 5139 316 RG* 13 27 23.0496409200 -47 43 55.474026348   13.950 12.540     ~ 15 0
25 2MASS J13272418-4734209 RG* 13 27 24.1968775560 -47 34 20.830761912 15.59 14.220 12.899   11.671 ~ 14 0
26 2MASS J13273303-4726120 RG* 13 27 33.0466654440 -47 26 11.965454232 16.01 14.050 12.512   10.935 ~ 23 0
27 NGC 5139 219 RG* 13 28 13.5721791960 -47 24 23.564480436   13.802 12.165 11.825   ~ 39 0
28 NGC 5139 279 RG* 13 28 21.2929487544 -47 20 30.256651860   12.8 12.32 12.14 11.04 ~ 25 0
29 NGC 5139 70 RG* 13 28 39.9394751616 -47 26 33.188838180   13.49 11.66 11.19   C1,2_CH? 42 0
30 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1976 0
31 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1847 0
32 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2190 0
33 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2113 0
34 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
35 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1126 0
36 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3138 0
37 NGC 5139 425 * ~ ~   14.37 12.68     S 15 0
38 Cl* NGC 5139 MAR 17 * ~ ~   14.55 12.75     ~ 2 0
39 Cl* NGC 5139 MAR 6 * ~ ~   13.99 12.45     ~ 2 0
40 Cl* NGC 5139 MAR 53 * ~ ~   13.73 11.95     ~ 2 0

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