Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...352l..40m&link_type=abstract
Astronomy and Astrophysics, v.352, p.L40-L44 (1999)
Astronomy and Astrophysics
Astrophysics
27
Atomic Data, Line: Formation, Stars: Hertzsprung-Russel (Hr) And C-M Diagrams, Stars: Early-Type, Stars: Supergiants
Scientific paper
Half hour exposures using the ESO VLT/FORS1 combination at Parañal in Chile have allowed us to obtain spectra for three B supergiants in the dwarf irregular galaxy NGC 6822. The spectra have been analysed using non-LTE techniques and temperatures, gravities, helium content and abundances have been obtained. Overall the metallicity of NGC 6822 is found to lie between that of the LMC and of the SMC, in agreement with previous observations of H ii regions and in contrast to the earlier findings of Massey et al. (\cite{massey}). The analysis of Halpha yields estimates of the mass-loss rates and wind momenta. These results demonstrate that significantly longer exposures with the same instruments will allow us to perform quantitative spectroscopy of blue supergiants in galaxies far beyond the Local Group.
Appenzeller Immo
Bresolin Fabio
Butler Keith
Gassler Wolfgang
Häfner Ralf
No associations
LandOfFree
VLT FORS spectra of blue supergiants in the Local Group galaxy NGC 6822 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with VLT FORS spectra of blue supergiants in the Local Group galaxy NGC 6822, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLT FORS spectra of blue supergiants in the Local Group galaxy NGC 6822 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1735128