期刊
ASTRONOMY & ASTROPHYSICS
卷 485, 期 1, 页码 41-U42出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200809399
关键词
galaxies : individual : NGC 55; galaxies : stellar content; stars : early-type; stars : fundamental parameters; catalogs
Aims. This is the first paper of a series devoted to studying the population of blue massive stars in NGC55, a galaxy of the Sculptor group at a distance of about 2 Mpc. Methods. We have obtained optical (3300-6210 angstrom), low-resolution spectra of approximately 200 blue massive stars with VLT-FORS2, which we have classified with the aid of Milky Way and Magellanic Cloud standard stars. Results. We present the first census of massive blue stars in NGC55. A study of stellar radial velocities shows agreement with existing Hi rotational velocity curve work and reveals the presence of one object with peculiar velocity. A qualitative study of the stellar metallicity suggests that its global distribution over NGC55 is close to that of the LMC, as derived from previous studies. Conclusions. We present a catalogue with 164 classifications of blue massive stars in NGC55. This catalogue is a first and necessary step for the subsequent quantitative study of blue massive stars in NGC55 with state-of-the-art model atmospheres.
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