Issue |
A&A
Volume 406, Number 1, July IV 2003
|
|
---|---|---|
Page(s) | 119 - 130 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20030605 | |
Published online | 17 November 2003 |
Stellar tracers of the Cygnus Arm*
I. Spectroscopic study of bright photometric candidates
1
Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
2
Dpto. de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
Corresponding author: I. Negueruela, ignacio@dfists.ua.es
Received:
7
March
2003
Accepted:
14
April
2003
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 , 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.
Key words: stars: early-type / stars: distances / Galaxy: structure / open clusters and associations: general
© ESO, 2003
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