Cepheids in the Andromeda Nebula and the structure of a spiral arm

Details Cepheids in the Andromeda Nebula and the structure of a spiral arm Cepheids in the Andromeda Nebula and the structure of a spiral arm

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..275e&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 6, May 1980, p. 275-281.) Soviet Astronomy Letters, vol. 6, May-June 1980, p. 152-156.

Astronomy and Astrophysics

Astronomy

7

Andromeda Galaxy, Cepheid Variables, Galactic Structure, Spiral Galaxies, Star Distribution, Astronomical Maps, Density Wave Model, Stellar Evolution

Scientific paper

The spiral arm S4 in the galaxy M31 is outlined by Cepheids of all periods just as well as by groups of blue stars. The longer-period Cepheids are concentrated toward the inner edge of the arm. The appreciable stellar age gradient across the arm and several other manifestations of a spiral density wave are attributable to the large (25 deg) pitch angle in this part of the arm, a circumstance that may also have split it into three subarms. The period (age) gradient of the Cepheids across the arm implies an angular rotational velocity of 10 km/sec kpc for the spiral pattern. In our Galaxy, no well-defined spiral arm analogous to S4 exists in the solar neighborhood, perhaps because the sun is close to the corotation radius.

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