Volume 403, Number 1, May III 2003
|Page(s)||93 - 103|
|Published online||29 April 2003|
II. NGC 185 and NGC 147
Institut für Astronomie der Universität Wien, Türkenschanzstraße 17, 1180 Wien, Austria
2 SCFAB, Stockholm Observatory / Department of Astronomy, 106 91 Stockholm, Sweden
3 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
Corresponding author: W. Nowotny, firstname.lastname@example.org
Accepted: 25 February 2003
We present results of our ongoing photometric survey of Local Group galaxies, using a four filter technique based on the method of Wing ([CITE]) 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 M 31 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 Mi , bolometric magnitudes Mbol, luminosity functions, and the spatial/radial distributions of the C stars in both galaxies.
Key words: stars: AGB and post-AGB / stars: carbon / galaxies: Local Group / galaxies: individual: NGC 185, NGC 147 / surveys
Based on observations made with the Nordic Optical Telescope operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
© ESO, 2003
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