2000MNRAS.313..571S

Query : 2000MNRAS.313..571S

2000MNRAS.313..571S - Mon. Not. R. Astron. Soc., 313, 571-586 (2000/April-2)

A catalogue of helium abundance indicators from globular cluster photometry.

SANDQUIST E.L.

Abstract (from CDS):

We present a survey of helium abundance indicators derived from a comprehensive study of globular cluster photometry in the literature. For each of the three indicators used, we conduct a thorough error analysis, and identify systematic errors in the computational procedures. For the population ratio RNHBNRGB, we find that there is no evidence of a trend with metallicity, although there appears to be real scatter in the values derived. Although this indicator is the one best able to provide useful absolute helium abundances, the mean value is Y~0.20, indicating the probable presence of additional systematic error.

For the magnitude difference from the horizontal branch to the main sequence Δ and the RR Lyrae mass-luminosity exponent A, it is only possible to determine relative helium abundances reliably. This is due to continuing uncertainties in the absolute metallicity scale for Δ, and uncertainty in the RR Lyrae temperature scale for A. Both indicators imply that the helium abundance is approximately constant as a function of [Fe/H]. According to the A indicator, both Oosterhoff I and II group clusters have constant values independent of [Fe/H] and horizontal branch type. In addition, the two groups have slopes dlog<]Pab>/d[Fe/H] that are consistent with each other, but significantly smaller than the slope for the combined sample.


Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): catalogues - stars: abundances - stars: variables: other - globular clusters: general

Simbad objects: 88

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Number of rows : 88
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     ~ 3917 0
2 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 311 0
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1042 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1085 0
5 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 520 0
6 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 162 0
7 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 163 1
8 NGC 1841 GlC 04 45 24.38 -83 59 53.3   12.23 11.43     ~ 182 0
9 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 146 0
10 NGC 1835 Cl* 05 05 09.210 -69 24 20.96   11.314 10.596     ~ 166 0
11 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1430 0
12 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 817 0
13 NGC 2210 GlC 06 11 31.296 -69 07 17.04   10.9 10.94     ~ 187 0
14 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 216 0
15 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1125 0
16 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 497 0
17 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 932 0
18 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1420 0
19 NAME Sextans dSph G 10 13 02.9 -01 36 53   12 10.4     ~ 854 0
20 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 885 0
21 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 573 0
22 NGC 4499 EmG 12 32 04.9511271168 -39 58 57.352022256   13.58   12.20   ~ 37 0
23 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 377 0
24 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 997 0
25 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 425 0
26 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 836 0
27 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 620 0
28 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
29 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2479 0
30 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 443 0
31 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 828 0
32 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 300 0
33 NGC 5694 GlC 14 39 36.52 -26 32 18.0           ~ 301 0
34 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 408 0
35 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1360 0
36 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 389 0
37 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1978 0
38 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 462 0
39 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 374 0
40 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 716 0
41 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1850 0
42 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 214 0
43 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 786 0
44 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2193 0
45 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 366 0
46 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 677 0
47 NGC 6235 GlC 16 53 25.36 -22 10 38.8   11.99 7.20     ~ 186 0
48 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 789 0
49 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 620 0
50 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 369 1
51 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 278 0
52 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 281 0
53 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2116 0
54 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 317 0
55 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1331 1
56 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 312 0
57 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 585 0
58 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 914 1
59 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 386 0
60 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1976 0
61 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 222 0
62 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 225 0
63 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 296 0
64 NGC 6558 GlC 18 10 17.6 -31 45 50           ~ 225 0
65 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 288 0
66 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 886 1
67 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 770 0
68 NGC 6638 GlC 18 30 56.25 -25 29 47.1   10.81 9.68     ~ 234 0
69 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 462 0
70 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 439 0
71 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1379 0
72 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 386 0
73 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 519 0
74 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1069 0
75 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 244 0
76 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 500 0
77 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2001 0
78 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 854 0
79 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1128 0
80 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 366 0
81 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 422 0
82 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 430 0
83 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 532 0
84 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3140 0
85 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1030 1
86 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1049 0
87 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 277 1
88 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 301 0

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