2002A&A...390..937I

Query : 2002A&A...390..937I

2002A&A...390..937I - Astronomy and Astrophysics, volume 390937-943 (2002/8-2)

Red giant branch stars as probes of stellar populations. I. 2MASS calibration and application to 2MASS GC01.

IVANOV V.D. and BORISSOVA J.

Abstract (from CDS):

The near-infrared behavior of the red giant branch (RGB hereafter) as a function of abundance is examined with an unprecedented large sample of 27 Galactic globular clusters with Two Micron All Sky Survey photometry. We propose a new simplified analysis, involving the zero point of the RGB slope fit, and derive calibrations for the RGB slope, zero point, and tip. The weak metallicity sensitivity of the zero point leads to a ``fan''-like diagram to obtain the abundance distributions in resolved stellar systems, and reddening estimates. Finally, we apply the new calibrations to the recently discovered Galactic globular cluster 2MASS GC01, to derive [Fe/H]H96=-1.19±0.38mag. The uncertainty is dominated by the severe foreground contamination. We estimate an extinction of AV=21.07±2.20mag toward the cluster.

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Journal keyword(s): Galaxy: globular clusters: general - Galaxy: abundances - galaxies: abundances - galaxies: distances and redshifts - stars: distances - stars: abundances

Simbad objects: 29

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Number of rows : 29
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
4 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
5 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
6 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
7 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
8 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
9 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
11 NGC 6144 GlC 16 27 13.86 -26 01 24.6           ~ 268 0
12 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
13 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
14 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
15 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 302 0
16 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 372 1
17 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
18 [HJK2000] GC01 GlC 18 08 21.8 -19 49 47           ~ 69 0
19 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
20 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
21 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
22 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
23 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 455 0
24 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
25 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
26 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 394 0
27 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
28 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
29 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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