A census of AGB stars in local group galaxies - III. The dwarf spheroidal And II

被引：13

作者：

Kerschbaum, F

Nowotny, W

Olofsson, H

Schwarz, HE

机构：

[1] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

[2] Stockholm Observ, Dept Astron, SCFAB, S-10691 Stockholm, Sweden

[3] Cerro Tololo Interamer Observ, La Serena, Chile

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 427卷 / 02期

关键词：

stars : AGB and post-AGB; stars : carbon; galaxies : local Group; galaxies : individual : And II; techniques : photometric; surveys;

D O I：

10.1051/0004-6361:20041045

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Our photometric survey of Local Group galaxies, using a four filter technique based on the method of Wing ( 1971) allows the identification and subsequent characterization of their late-type stellar content. Two narrow band filters centred on molecular bands of TiO and CN allow us to distinguish between AGB stars of different chemistries [M-type (O-rich) and C-type (C-rich)]. The faint dwarf spheroidal galaxy And II, a member of the M 31 subgroup, was surveyed. From photometry in V and i as well as in the narrow band filters TiO and CN we were able to identify 7 new AGB carbon stars, to derive their mean absolute <M-i> and bolometric magnitude M-bol, their luminosity function, and their spatial distribution. We are unable to establish the true C/M ratio because the few M stars of And II are overwhelmed by foreground Galactic M stars.

引用

页码：613 / 619

页数：7