1999A&AS..135..103A

Query : 1999A&AS..135..103A

1999A&AS..135..103A - Astron. Astrophys., Suppl. Ser., 135, 103-109 (1999/February-2)

Bright populations of the LMC cluster NGC 1978 from multicolor CCD photometry.

ALCAINO G., LILLER W., ALVARADO F., KRAVTSOV V., IPATOV A., SAMUS N. and SMIRNOV O.

Abstract (from CDS):

We have carried out multicolor (BVRI) photometry for 3077 stars in the field of the populous cluster NGC 1978 in the Large Magellanic Cloud. We find a clear discrepancy in the zero point of our V magnitudes in NGC 1978 with earlier work (Bomans et al. 1995A&A...298..427B). A large sample of horizontal-branch stars (319 objects) has been isolated. Our study of color distributions of HB stars in different parts of the cluster reveals some variations of the shape of the distributions across the cluster face. We also find some difference in CMD positions of the lower giant branch dependent upon the position in the cluster. Thus, we do not exclude the presence of two subpopulations in NGC 1978; to explain the observations, a difference in [Fe/H] by ∼0.1-0.2 between them would be sufficient.

Abstract Copyright: ∼

Journal keyword(s): galaxies: star clusters - Magellanic Clouds - clusters: globular: individual: NGC 1978 (LMC) - HR diagram

Simbad objects: 9

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Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	NAME LMC	G	05 23 34.6	-69 45 22		0.4	~	16636	1
2	NGC 1978	GlC	05 28 45.330	-66 14 12.04	10.7	10.70	~	300	0
3	Cl* NGC 1978 AWAL G	*	~	~	14.52	14.60	~	2	0
4	Cl* NGC 1978 AWAL H	*	~	~	14.71	14.73	~	2	0
5	Cl* NGC 1978 OPS 41	*	~	~	15.33	13.62	~	2	0
6	Cl* NGC 1978 AWAL E	*	~	~	14.0	13.92	~	2	0
7	Cl* NGC 1978 AWAL J	*	~	~		15.33	~	2	0
8	Cl* NGC 1978 AWAL I	*	~	~	16.38	14.82	~	2	0
9	Cl* NGC 1978 AWAL F	*	~	~	14.36	14.52	~	2	0

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