Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.110..357i&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 110, no. 2, March 1985, p. 357-369.
Astronomy and Astrophysics
Astrophysics
11
Andromeda Galaxy, Color-Magnitude Diagram, Galactic Structure, Spiral Galaxies, Stellar Spectrophotometry, Ubv Spectra, B Stars, Color-Color Diagram, Milky Way Galaxy, O Stars, Star Distribution, Stellar Color, Stellar Evolution, Stellar Rotation
Scientific paper
The UBV photometry of 690 stars in the spiral arm S4 and the U magnitudes of 120 stars in the spiral arm S6 with the help of the 2 m RCC telescope of the Rozhen Observatory at the Bulgarian Academy of Sciences, has been used to obtain the colour-magnitude and colour-colour diagrams across the arms. The age gradient across the S4 arm has been found. The author has evaluated the velocity of star formation propagation across the arm S4 ω| ≈ 60 km s-1, pattern frequency Ωp ≈ 14 km s-1kpc-1 and corotation radius Rc ≈ 20 kpc. A value of pattern frequency Ωp = 12 km s-1kpc-1 and Rc = 12 kpc of our Galaxy has been obtained from the age distribution of the open clusters and cepheids across the Carina-Sagittarius arm. The spiral structure of M31 has been compared with that of our Galaxy.
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