The spiral structure of M31 - A morphological approach

Details The spiral structure of M31 - A morphological approach The spiral structure of M31 - A morphological approach

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67...73s&link_type=abstract

Astronomy and Astrophysics, vol. 67, no. 1, June 1978, p. 73-79.

Astronomy and Astrophysics

Astrophysics

42

Andromeda Galaxy, Galactic Structure, Spiral Galaxies, B Stars, Elliptical Galaxies, H Ii Regions, Hydrogen Atoms, Hydrogen Ions, O Stars

Scientific paper

The problem of the spiral structure of M31 has been reconsidered, based on a new list of 981 H II regions and the OB associations of van den Bergh. The distribution of these arm tracers, as well as arguments concerning the H I density and an asymmetry in the rotation curve leads to the conclusion that the most probable solution for the unusual structure of M31 is a one-armed leading pattern (Kalnajs' solution), forced by the close companion M32, and that the classical two-armed trailing spiral is far less satisfactory.

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