Blue Massive Stars in NGC 55: A First Quantitative Study
Abstract
We present the first census of blue massive stars in NGC 55, a galaxy of the Sculptor group at 1.94 Mpc. This study is based on optical low-resolution spectra of approximately 200 objects taken with VLT-FORS2. We have performed the spectral classification of these objects. The estimated stellar radial velocities show general agreement with the existing HI rotational velocity data. A first 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 of H II regions. We have also determined the stellar parameters of one star showing that the resolution and the quality of the spectra are reliable to perform a quantitative analysis.
- Publication:
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Highlights of Spanish Astrophysics V
- Pub Date:
- 2010
- DOI:
- 10.1007/978-3-642-11250-8_34
- Bibcode:
- 2010ASSP...14..269C
- Keywords:
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- Physics