Magellanic Clouds stellar clusters.: II.: New B, V CM diagrams for 6 LMC and 10 SMC clusters

被引:20
作者
Matteucci, A
Ripepi, V
Brocato, E [2 ]
Castellani, V
机构
[1] Osserv Astron Capodimonte, I-80131 Naples, Italy
[2] Osservatorio Astron Collurania, I-64100 Teramo, Italy
[3] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy
关键词
galaxies : clusters : general; galaxies : stellar content; galaxies : Magellic Clouds;
D O I
10.1051/0004-6361:20020376
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present new CCD photometry for 6 LMC and 10 SMC stellar clusters taken at the ESO 1.54-m Danish Telescope in La Silla, to extend a previous investigation on Magellanic Clouds clusters based on HST snapshots. Thanks to the much larger area covered by the Danish detector, we investigate the spatial distribution of cluster stars, giving V, (B V) CM diagrams for both clusters and surrounding fields. Evidence of a complex history of star formation in the Clouds is outlined, showing that old field populations in both Clouds have metallicities much lower than normally adopted for them (Z = 0.008 and Z = 0.004 for LMC and SMC respectively), with SMC field stars more metal poor than in the LMC. Observational data concerning the red clump of field stars in both Clouds are briefly discussed.
引用
收藏
页码:861 / 889
页数:29
相关论文
共 36 条
[11]   Fine structure of the red giant clump from Hipparcos data, and distance determinations based on its mean magnitude [J].
Girardi, L ;
Groenewegen, MAT ;
Weiss, A ;
Salaris, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 301 (01) :149-160
[12]   UBVRI STANDARD STARS IN THE E-REGIONS [J].
GRAHAM, JA .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1982, 94 (558) :244-265
[13]   A catalog of parameters for globular clusters in the Milky Way [J].
Harris, WE .
ASTRONOMICAL JOURNAL, 1996, 112 (04) :1487-1488
[14]   THE INTERMEDIATE AGE GLOBULAR-CLUSTER NGC 152 IN THE SMALL MAGELLANIC CLOUD [J].
HODGE, PW .
ASTROPHYSICAL JOURNAL, 1981, 247 (03) :894-907
[15]   UBVRI PHOTOMETRIC STANDARD STARS IN THE MAGNITUDE RANGE 11.5-LESS-THAN-V-LESS-THAN-16.0 AROUND THE CELESTIAL EQUATOR [J].
LANDOLT, AU .
ASTRONOMICAL JOURNAL, 1992, 104 (01) :340-&
[16]   CCD PHOTOMETRY OF LARGE MAGELLANIC CLOUD CLUSTERS .1. THE REMOTE CLUSTER NGC-1777 [J].
MATEO, M ;
HODGE, P .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1985, 97 (595) :753-779
[17]  
MATTEUCCI A, 2001, THESIS U STUDI PISA
[18]   Old and intermediate-age stellar populations in the magellanic clouds [J].
Olszewski, EW ;
Suntzeff, NB ;
Mateo, M .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1996, 34 :511-550
[19]   Galactocentric distance with the OGLE and Hipparcos red clump stars [J].
Paczynski, B ;
Stanek, KZ .
ASTROPHYSICAL JOURNAL, 1998, 494 (02) :L219-L222
[20]   Two groups of nearly coeval star clusters in the Small Magellanic Cloud [J].
Rich, RM ;
Shara, M ;
Fall, SM ;
Zurek, D .
ASTRONOMICAL JOURNAL, 2000, 119 (01) :197-206