Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..86..117e&link_type=abstract
Astrophysics and Space Science, vol. 86, no. 1, Aug. 1982, p. 117-129.
Astronomy and Astrophysics
Astrophysics
18
Andromeda Galaxy, Astronomical Spectroscopy, Spiral Galaxies, Star Distribution, Stellar Evolution, Stellar Luminosity, Brightness, Galactic Structure, Radiant Flux Density
Scientific paper
Approximately 1400 stars in the spiral arm S4 of Andromeda were measured on a plate obtained with the 2-m RC telescope of the Bulgarian National Observatory. A pronounced gradient of star luminosity and density was found in the central part of S4; here, the stars become fainter at about 2m and their surface density decreases tenfold at a distance of approximately 1 kpc from the inner edge of the arm. The decline of maximum star brightness from this edge is interpreted as an age gradient; the velocity of star formation propagation across the arm was determined as approximately 60 km/s. If Andromeda has trailing spiral arms and the pitch angle of S4 is approximately 25 deg in its central part, the pattern velocity is approximately 7-14 km/s kpc.
Efremov Iu. N.
Ivanov George R.
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