EDP Sciences
Free access
Volume 403, Number 1, May III 2003
Page(s) 111 - 117
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030380

A&A 403, 111-117 (2003)
DOI: 10.1051/0004-6361:20030380

Spectroscopy of early-type star candidates in M 33 and NGC 6822. II

G. Catanzaro1, 2, L. Bianchi2, S. Scuderi1 and A. Manchado3, 4

1  INAF - Catania Astrophysical Observatory, via S. Sofia n. 78, 95123, Catania, Italy
    e-mail: scuderi@ct.astro.it
2  Center for Astrophysical Sciences, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2695, USA
    e-mail: bianchi@pha.jhu.edu
3  Instituto de Astrofisica de Canarias, via Láctea, 38200 La Laguna, Tenerife, Spain
    e-mail: amt@ll.iac.es
4  Consejo Superior de Investigaciones Cientificas, Spain

(Received 18 September 2002 / Accepted 5 March 2003)

We present ground-based spectra of early-type star candidates in the Local Group galaxies M 33 and NGC 6822 taken at the 4.2 m William Herschel Telescope (La Palma, Spain). Photospheric parameters $T_{\rm eff}$ and $\log g$ were derived by LTE modeling of the Balmer lines. When possible, mass-loss rates were calculated from the H $_{\alpha}$ profiles computing emission and scattering in the wind with the method of Scuderi et al. (1992). Five hot star candidates were found in M 33, out of seven stars analyzed, and two out of three in NGC 6822.

Key words: galaxies: individual: M 33, NGC 6822 -- stars: early type -- stars: fundamental parameters -- stars: atmospheres -- stars: mass loss

Offprint request: G. Catanzaro, gca@ct.astro.it

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