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

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

2002A&A...390..937I - Astronomy and Astrophysics, volume 390, 937-943 (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 A_V=21.07±2.20mag toward the cluster.

Abstract Copyright: ∼

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

Simbad objects: 29

Full paper

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Number of rows : 29

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2022	#notes
1	NGC 104	GlC	00 24 05.359	-72 04 53.20	5.78	4.09			~	3722	0
2	NGC 288	GlC	00 52 45.24	-26 34 57.4	10	8.13			~	983	0
3	NGC 1851	GlC	05 14 06.76	-40 02 47.6					~	1329	0
4	M 79	GlC	05 24 10.59	-24 31 27.3	9.21	8.16			~	762	0
5	NGC 2298	GlC	06 48 59.41	-36 00 19.1	10.77	8.89			~	459	0
6	M 105	LIN	10 47 49.600	+12 34 53.87	10.56	9.76	9.12	8.18	~	1417	0
7	M 53	GlC	13 12 55.25	+18 10 05.4	8.95	7.79			~	773	0
8	NGC 5139	GlC	13 26 47.28	-47 28 46.1	6.12	5.33			~	3229	0
9	NGC 5466	GlC	14 05 27.29	+28 32 04.0	10.5	9.70			~	775	0
10	M 4	GlC	16 23 35.22	-26 31 32.7					~	1757	0
11	NGC 6144	GlC	16 27 13.86	-26 01 24.6	10.55	9.63			~	222	0
12	M 107	GlC	16 32 31.86	-13 03 13.6	9.96	8.85			~	744	0
13	M 13	GlC	16 41 41.634	+36 27 40.75		5.8			~	2099	0
14	M 19	GlC	17 02 37.69	-26 16 04.6	8.45	5.57			~	341	1
15	NGC 6284	GlC	17 04 28.747	-24 45 51.22	10.72	7.43			~	255	0
16	NGC 6356	GlC	17 23 34.99	-17 48 46.9	10.01	7.42			~	333	1
17	NGC 6441	GlC	17 50 13.06	-37 03 05.2	9.26	8.00			~	828	0
18	NAME 2MASS-GC01	GlC	18 08 21.8	-19 49 47					~	46	0
19	NGC 6624	GlC	18 23 40.51	-30 21 39.7					~	823	1
20	M 69	GlC	18 31 23.10	-32 20 53.1	9.32	8.31			~	434	1
21	M 22	GlC	18 36 23.94	-23 54 17.1	7.16	6.17			~	1295	0
22	M 54	GlC	18 55 03.33	-30 28 47.5					~	995	0
23	M 56	GlC	19 16 35.57	+30 11 00.5	8.90				~	389	0
24	M 55	GlC	19 39 59.71	-30 57 53.1		6.49			~	807	0
25	M 71	GlC	19 53 46.49	+18 46 45.1	7.91	6.1			~	1072	0
26	M 75	GlC	20 06 04.841	-21 55 20.14		8.26			~	338	0
27	M 15	GlC	21 29 58.33	+12 10 01.2	3				~	3021	0
28	M 2	GlC	21 33 27.02	-00 49 23.7		6.25			~	963	1
29	M 30	GlC	21 40 22.12	-23 10 47.5		7.10			~	978	0

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