A census of AGB stars in Local Group galaxies

Free access article

Issue		A&A Volume 427, Number 2, November IV 2004


Page(s)		613 - 619
Section		Stellar structure and evolution
DOI		http://dx.doi.org/10.1051/0004-6361:20041045

A&A 427, 613-619 (2004)
DOI: 10.1051/0004-6361:20041045

III. The dwarf spheroidal And II

F. Kerschbaum¹, W. Nowotny¹, H. Olofsson² and H. E. Schwarz³

¹ Institut für Astronomie der Universität Wien, Türkenschanzstraße 17, 1180 Wien, Austria
e-mail: kerschbaum@astro.univie.ac.at
² SCFAB, Stockholm Observatory / Department of Astronomy, 10691 Stockholm, Sweden
³ Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile

(Received 6 April 2004 / Accepted 20 July 2004)

Abstract
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 $\langle$ M_i $\rangle$ and bolometric magnitude $M_{{\rm bol}}$ , 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.

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

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