Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...58..121a&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 58, Oct. 1984, p. 121-130. Research supported by the Swiss N
Astronomy and Astrophysics
Astrophysics
1
Astronomical Photometry, Galactic Structure, Interstellar Extinction, Nebulae, Star Clusters, Density Wave Model, Milky Way Galaxy, Star Distribution, Stellar Color, Stellar Magnitude, Ubv Spectra
Scientific paper
A field of 0.21 sq deg containing 2099 stars in the Carina region near the cluster IC 2581, has been measured on 14 plates in the RGU system. The reddening is caused by a thin absorbing cloud at 770 pc with E(G-R) = 0.23 mag, as well as an interstellar absorption free zone followed by a moderate gradient which increases with distance. The density gradients corresponding to late-type giants and main sequence stars of the same absolute magnitude do not display the same behavior. Assuming that the outer edge of the arm of Carina is being observed, the present results seem to corroborate the existence of external spiral features between 12 and 13 kpc. The distribution of F0-F5 stars seems to confirm predictions of the theory of density waves.
Alfaro Emilio J.
Garcia-Pelayo Jose Manuel
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