SIMBAD references

2003A&A...406..119N - Astronomy and Astrophysics, volume 406, 119-130 (2003/7-4)

Stellar tracers of the Cygnus Arm. I. Spectroscopic study of bright photometric candidates.


Abstract (from CDS):

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=150°-180°, there is a large number of objects with distances in excess of 4kpc, 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.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: distances - Galaxy: structure - open clusters and associations: general

Simbad objects: 87

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