A census of AGB stars in local group galaxies. II. NGC 185 and NGC 147

Autor(en)

Walter Nowotny-Schipper, Franz Kerschbaum, Hans Olofsson, H E Schwarz

Abstrakt

We present results of our ongoing photometric survey of Local Group galaxies, using a four filter technique based on the method of Wing (1971) to identify and characterise the late-type stellar content. Two narrow band filters centred on spectral features of TiO and CN allow us to distinguish between AGB stars of different chemistries [M-type (O-rich) and C-type (C-rich)]. The major parts of two dwarf galaxies of the M31 subgroup - NGC 185 and NGC 147 - were observed. From photometry in V and i we estimate the tip of the RGB, and derive distance moduli respectively. With additional photometric data in the narrow band filters TiO and CN we identify 154 new AGB carbon stars in NGC 185 and 146 in NGC 147. C/M ratios are derived, as well as mean absolute magnitudes , bolometric magnitudes Mbo1, luminosity functions, and the spatial/radial distributions of the C stars in both galaxies.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Stockholm Observatory, Nordic Optical Telescope

Journal

Astronomy & Astrophysics

Band

403

Seiten

93-103

Anzahl der Seiten

11

ISSN

0004-6361

Publikationsdatum

2003

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8d7b5b78-b00c-4d79-8f88-ca01e39b203e