Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-05
Astrophys.J.659:1198-1211,2007
Astronomy and Astrophysics
Astrophysics
42 pages, 19 figures (most reduced in size). Accepted for publication in ApJ. A copy with full res. & embedded figures is at
Scientific paper
10.1086/511382
We have obtained multi-object spectroscopy of luminous blue supergiants in NGC 3109, a galaxy at the periphery of the Local Group at ~1.3 Mpc. We present a detailed catalog including finding charts, V and I magnitudes, spectral classifications, and stellar radial velocities. The radial velocities are seen to trace the rotation curves obtained from studies of the HI gas. From quantitative analysis of eight B-type supergiants we find a mean oxygen abundance of 12+log(O/H) = 7.76 +/-0.07 (1-sigma systematic uncertainty), with a median result of 7.8. Given its distance, we highlight NGC 3109 as the ideal example of a low metallicity, dark-matter dominated, dwarf galaxy for observations with the next generation of ground-based extremely large telescopes (ELTs).
Bresolin Fabio
Evans John C. Jr.
Gieren Wolfgang
Kudritzki Rolf Peter
Pietrzynski Grzegorz
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