2014ApJ...786...14M

Query : 2014ApJ...786...14M

2014ApJ...786...14M - Astrophys. J., 786, 14 (2014/May-1)

The helium abundance in the metal-poor globular clusters M30 and NGC 6397.

MUCCIARELLI A., LOVISI L., LANZONI B. and FERRARO F.R.

Abstract (from CDS):

We present the helium abundance of the two metal-poor clusters M30 and NGC 6397. Helium estimates have been obtained by using the high-resolution spectrograph FLAMES at the European Southern Observatory Very Large Telescope and by measuring the He I line at 4471 Å in 24 and 35 horizontal branch (HB) stars in M30 and NGC 6397, respectively. This sample represents the largest data set of He abundances collected so far in metal-poor clusters. The He mass fraction turns out to be Y = 0.252±0.003 (σ = 0.021) for M30 and Y = 0.241±0.004 (σ = 0.023) for NGC 6397. These values are fully compatible with the cosmological abundance, thus suggesting that the HB stars are not strongly enriched in He. The small spread of the Y distributions are compatible with those expected from the observed main sequence splitting. Finally, we find a hint of a weak anticorrelation between Y and [O/Fe] in NGC 6397 in agreement with the prediction that O-poor stars are formed by (He-enriched) gas polluted by the products of hot proton-capture reactions.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: (M30, NGC 6397) - stars: abundances - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/786/14): table1.dat>

Simbad objects: 76

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Number of rows : 76
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
2 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
3 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
4 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
6 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
7 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
8 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
9 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
10 [LML2012] 51874 HB* 17 39 51.1892530176 -53 41 20.722482024     13.77   13.56 ~ 2 0
11 [LML2012] 53805 HB* 17 39 51.3307460952 -53 39 05.648765472     13.30   13.00 ~ 2 0
12 NGC 6397 26 HB* 17 39 59.4974161944 -53 35 53.380247712   13.63 13.46   13.15 ~ 7 0
13 [LML2012] 18540 HB* 17 40 03.2778668184 -53 31 18.450064956     13.23   12.93 ~ 5 0
14 NGC 6397 29 HB* 17 40 06.8859204696 -53 34 44.922826164     13.55   13.28 ~ 5 0
15 NGC 6397 135 HB* 17 40 15.3889980408 -53 38 47.500286712     13.64   13.37 ~ 5 0
16 NGC 6397 101 HB* 17 40 27.3069728088 -53 37 38.979995340     13.31   13.02 ~ 4 0
17 NGC 6397 39 HB* 17 40 29.4633856560 -53 35 16.493898768     13.41   13.16 ~ 6 0
18 [LML2012] 12158 HB* 17 40 32.1030658152 -53 26 32.803747116     13.72   13.52 ~ 3 0
19 [LML2012] 2200028 HB* 17 40 34.1894848944 -53 39 20.887171380     13.54   13.29 ~ 2 0
20 [LML2012] 11363 HB* 17 40 34.6366251000 -53 28 49.084317840     13.753   13.51 ~ 3 0
21 [LML2012] 65798 HB* 17 40 36.7761596952 -53 43 38.403952824     13.50   13.24 ~ 2 0
22 NGC 6397 44 HB* 17 40 39.6009439080 -53 34 09.962507568   13.45 13.27   12.89 A0p 6 0
23 NGC 6397 45 HB* 17 40 39.8052361848 -53 34 39.028916676     13.77   13.55 ~ 6 0
24 [LML2012] 1100024 HB* 17 40 40.3499870040 -53 40 54.068096208     13.54   13.37 ~ 2 0
25 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
26 [LML2012] 76738 HB* 17 40 42.1501744296 -53 38 09.022688520     13.61   13.37 ~ 2 0
27 NGC 6397 604 HB* 17 40 42.6542792712 -53 47 04.408062324     13.55   13.34 ~ 7 0
28 [LML2012] 1100029 HB* 17 40 43.735 -53 41 05.92     13.64   13.43 ~ 2 0
29 Cl* NGC 6397 V W HB* 17 40 43.9060970016 -53 31 00.576235596   12.91 13.742   13.49 ~ 4 0
30 [LML2012] 76330 HB* 17 40 47.761 -53 38 22.56     13.53   13.29 ~ 6 0
31 2MASS J17404779-5339515 RG* 17 40 47.8107166536 -53 39 51.685430256     13.43   13.20 ~ 6 0
32 [LML2012] 64937 HB* 17 40 55.8654018336 -53 44 16.239878808     13.43   13.17 ~ 3 0
33 NGC 6397 187 HB* 17 40 57.5994216048 -53 37 56.443103580   13.616 13.57   13.33 ~ 5 0
34 [LML2012] 82561 HB* 17 41 00.1028195520 -53 33 36.978728832     13.56   13.31 ~ 2 0
35 [LML2012] 74883 HB* 17 41 01.1331471144 -53 39 08.220743856     13.47   13.21 ~ 3 0
36 2MASS J17410181-5339555 HB* 17 41 01.81584 -53 39 55.5012     13.66   13.43 ~ 3 0
37 [LML2012] 11063 HB* 17 41 05.0068721880 -53 29 37.032327240     13.49   13.20 ~ 2 0
38 [LML2012] 72734 HB* 17 41 06.0466427976 -53 40 09.470050644     13.43   13.19 ~ 2 0
39 NGC 6397 4 RG* 17 41 09.6622579176 -53 32 46.399833456   13.61 13.43   13.06 A0p 10 0
40 NGC 6397 245 HB* 17 41 10.6899309000 -53 40 58.586148552     13.33   13.07 ~ 6 0
41 NGC 6397 210 HB* 17 41 13.2644023176 -53 39 31.151295720     13.58   13.36 ~ 6 0
42 NGC 6397 215 HB* 17 41 18.7520952768 -53 38 27.570830532     13.67   13.45 ~ 4 0
43 NGC 6397 1 HB* 17 41 25.9267938312 -53 32 42.746214048   14.58 13.48   13.24 ~ 5 0
44 [LML2012] 91315 HB* 17 41 38.9900614536 -53 38 44.736131796     13.52   13.29 ~ 2 0
45 [LML2012] 90302 HB* 17 41 58.2898770720 -53 40 25.710933072     13.43   13.18 ~ 5 0
46 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
47 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
48 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
49 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
50 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
51 Cl* NGC 7099 AL 56 HB* 21 40 06.3474307368 -23 10 33.079355328   15.76 15.91   15.84 ~ 5 0
52 [LML2013] 30000038 HB* 21 40 10.5054372840 -23 09 36.544387248     15.96   15.92 ~ 2 0
53 2MASS J21401374-2309515 HB* 21 40 13.7442645384 -23 09 51.467881680     15.57   15.48 ~ 3 0
54 2MASS J21401402-2312367 HB* 21 40 14.0181883968 -23 12 36.826217676     15.75   15.68 ~ 3 0
55 Cl* NGC 7099 AL 65 HB* 21 40 15.0751638768 -23 06 10.977624252   15.55 15.53   15.46 ~ 5 0
56 [LML2013] 30011110 HB* 21 40 15.6767833848 -23 09 05.214266640     15.56   15.47 ~ 2 0
57 2MASS J21401624-2306534 HB* 21 40 16.2396340224 -23 06 53.405971344     15.49   15.37 ~ 3 0
58 [LML2013] 30000019 HB* 21 40 18.2269900344 -23 09 18.100076652     15.56   15.46 ~ 2 0
59 [LML2013] 30007138 HB* 21 40 21.1521731448 -23 07 34.927237236     15.59   15.50 ~ 2 0
60 [LML2013] 10202614 HB* 21 40 21.3903 -23 10 16.199     15.82   15.75 ~ 2 0
61 [LML2013] 10203922 HB* 21 40 21.7192319424 -23 09 05.281563924     15.84   15.82 ~ 2 0
62 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
63 [LML2013] 30007156 HB* 21 40 23.5743212784 -23 06 54.815378976     15.91   15.87 ~ 2 0
64 [LML2013] 10201925 HB* 21 40 23.7496 -23 09 40.731     16.05   16.03 ~ 2 0
65 2MASS J21402519-2312562 HB* 21 40 25.1951292384 -23 12 56.284460172     15.53   15.41 ~ 3 0
66 [LML2013] 10401890 HB* 21 40 25.3680 -23 11 02.028     15.77   15.70 ~ 2 0
67 2MASS J21402589-2313295 HB* 21 40 25.8849989328 -23 13 29.638000668     15.94   15.89 ~ 3 0
68 [LML2013] 30016296 HB* 21 40 26.1623 -23 13 09.970     16.02   15.99 ~ 2 0
69 [LML2013] 10301333 HB* 21 40 27.2753040600 -23 10 30.781907400     15.80   15.76 ~ 2 0
70 [LML2013] 30012906 HB* 21 40 27.5796558960 -23 08 45.092779584     15.90   15.88 ~ 2 0
71 [LML2013] 10301793 HB* 21 40 28.8618894696 -23 10 25.321609524     15.62   15.57 ~ 2 0
72 [LML2013] 30015984 HB* 21 40 35.7694422288 -23 09 56.115610596     15.78   15.73 ~ 2 0
73 Cl* NGC 7099 AL 13 HB* 21 40 39.2294586648 -23 09 57.806753040   15.61 15.57   15.59 ~ 4 0
74 Cl* NGC 7099 SAN 20 HB* 21 40 44.0841089184 -23 09 39.022255152   15.5 15.67   15.61 ~ 3 0
75 PHL 4742 HB* 21 40 49.5370980432 -23 04 51.114291564   16.3 15.95   15.91 ~ 3 0
76 NAME Local Group GrG ~ ~           ~ 9325 0

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