The stellar content of the Sagittarius Dwarf Galaxy

被引：0

作者：

Marconi, G

Buonanno, R

Castellani, M

Iannicola, G

Molaro, P

Pasquini, L

Pulone, L

机构：

[1] Osservatorio Astron Roma, I-00040 Rome, Italy

[2] Univ Rome La Sapienza, Ist Astron, I-00161 Rome, Italy

[3] Osservatorio Astron Trieste, I-34131 Trieste, Italy

[4] European So Observ, La Silla, Chile

来源：

ASTRONOMY & ASTROPHYSICS | 1998年 / 330卷 / 02期

关键词：

techniques : photometry; stars : HR-diagrams; stars : luminosity function; galaxies : irregular; galaxies : stellar content;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present V,I deep CCD photometry for three fields of the dwarf galaxy in Sagittarius (Sgr), located at 1=5.6 degrees, b=14.1 degrees. One of the fields is centered on the globular cluster NGC 6715 (M54), which lies in one of the dense clumps of the Sgr galaxy. Comparing the CMD of Sgr with those of globular clusters which are believed to be kinematically associated with the dwarf galaxy (Da Costa & Armandroff 1995), we conclude that the stellar population of Sgr presents a spread in metallicity of -0.71 less than or equal to[Fe/H]less than or equal to-1.58, and that the dominant population (similar or equal to 10 Gyr old) is extremely similar to the star content of the associated globular cluster Terzan 7. The estimated distance to Sgr is d similar or equal to 24.55 Kpc.

引用

页码：453 / 463

页数：11

共 35 条

[1] Macho project photometry of RR Lyrae stars in the Sagittarius dwarf galaxy [J].

Alcock, C ;

Allsman, RA ;

Alves, DR ;

Axelrod, TS ;

Becker, AC ;

Bennett, DP ;

Cook, KH ;

Freeman, KC ;

Griest, K ;

Guern, JA ;

Lehner, MJ ;

Marshall, SL ;

Minniti, D ;

Petterson, BA ;

Pratt, MR ;

Quinn, PJ ;

Rodgers, AW ;

Stubbs, CW ;

Sutherland, W ;

Welch, DL .

ASTROPHYSICAL JOURNAL, 1997, 474 (01) :217-222

[2] TERZAN-7 - A YOUNG METAL-RICH GLOBULAR-CLUSTER IN THE MILKY-WAY [J].

BUONANNO, R ;

CORSI, CE ;

PULONE, L ;

PECCI, FF ;

RICHER, HB ;

FAHLMAN, GC .

ASTRONOMICAL JOURNAL, 1995, 109 (02) :663-671

[3]

BUONANNO R, 1983, ASTRON ASTROPHYS, V126, P278

[4]

BUONANNO R, 1989, ASTRON ASTROPHYS, V216, P80

[5] YOUNG GLOBULAR-CLUSTERS IN THE MILKY-WAY - ARP-2 [J].

BUONANNO, R ;

CORSI, CE ;

PECCI, FF ;

RICHER, HB ;

FAHLMAN, GG .

ASTRONOMICAL JOURNAL, 1995, 109 (02) :650-662

[6]

BUONANNO R, 1994, APJ, V430, P1121

[7]

BUONANNO R, 1995, FORMATION MILKY WAY, P279

[8]

CARDELLI JA, 1988, APJ, V329, P33

[9]

Castellani M, 1996, ASTRON ASTROPHYS, V310, P715

[10] Globular cluster ages and the formation of the galactic halo [J].

Chaboyer, B ;

Demarque, P ;

Sarajedini, A .

ASTROPHYSICAL JOURNAL, 1996, 459 (02) :558-569

← 1 2 3 4 →