Volume 485, Number 1, July I 2008
|Page(s)||41 - 50|
|Published online||28 April 2008|
Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain e-mail: email@example.com
2 Departamento de Astrofísica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez s/n, 38071 La Laguna, Tenerife, Spain
3 Astronomy Research Centre, Department of Physics & Astronomy, School of Mathematics & Physics, The Queen's University of Belfast, Belfast, Northern Ireland, UK
4 Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
5 Departamento de Física, Astronomy Group, Universidad de Concepción, Casilla 160-C, Concepción, Chile
6 Warsaw University Observatory, Al. Ujazdowskie 4, 00-478, Warsaw, Poland
7 Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
Accepted: 31 March 2008
Aims. This is the first paper of a series devoted to studying the population of blue massive stars in NGC 55, a galaxy of the Sculptor group at a distance of about 2 Mpc.
Methods. We have obtained optical ( Å), 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 NGC 55. A study of stellar radial velocities shows agreement with existing 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 NGC 55 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 NGC 55. This catalogue is a first and necessary step for the subsequent quantitative study of blue massive stars in NGC 55 with state-of-the-art model atmospheres.
Key words: galaxies: individual: NGC 55 / galaxies: stellar content / stars: early-type / stars: fundamental parameters / catalogs
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.