Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-16
Astron.Astrophys. 406 (2003) 119
Astronomy and Astrophysics
Astrophysics
13 pages, 7 figures. Uses new A&A macro (included). Accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20030605
We present medium-resolution spectroscopy of a sample of stars in the second Galactic quadrant selected from the literature because their colours suggest that they are moderately-reddened early-type stars at very large distances. From the derived spectral types and observed colours, we calculate distances to all these objects. For a sizable fraction of our sample, we find distances well in excess of what is expected for Perseus Arm objects, even allowing for rather generous errors. In the interval l=150degr-180degr, there is a large number of objects with distances in excess of 4 kpc, which are likely tracing the Outer or Cygnus Arm. In particular, we find that the association Cam OB3 is placed on this Arm. Based on our results, the extent and definition of the associations Cas OB4 and Aur OB2 need to be reevaluated.
Marco Amparo
Negueruela Ignacio
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