Structure across M31 arm S4

Details Structure across M31 arm S4 Structure across M31 arm S4

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..169e&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Mar. 1985, p. 169-177) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, Mar.-Apr

Astronomy and Astrophysics

Astronomy

1

Andromeda Galaxy, Density Wave Model, Galactic Structure, Spiral Galaxies, Cepheid Variables, Hydrogen Clouds, Stellar Evolution

Scientific paper

In the region extending from association OB 75 to OB 82 in spiral arm S4 of the Andromeda Nebula, the sites of maximum H2 and H I density coincide, while the brightest H II zones border the inner edge of the stellar arm. For high-luminosity stars and Cepheids in the central part of the arm, a diagram of age against distance from the arm edge yields a speed of 10-20 km/sec kpc for the spiral pattern, and implies that stars occur with both pre- and postshock velocities, as well as intermediate-velocity stars presumably formed in giant HI-H2 complexes. The structure of S4 between OB 75 and OB 82 accords with the density-wave theory.

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