Concentration of Cepheids and open clusters in the spiral arms of the galaxy

Details Concentration of Cepheids and open clusters in the spiral arms of the galaxy Concentration of Cepheids and open clusters in the spiral arms of the galaxy

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..579e&link_type=abstract

Astronomy Letters, Volume 23, Issue 5, September 1997, pp.579-584; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 659

Astronomy and Astrophysics

Astronomy

10

Scientific paper

The density of Cepheids and open clusters younger than 100 Myr within 1.4 kpc of the Sun was found to be a factor of 2 higher inside the Carina-Sagittarius arm than outside it. There is also evidence for a similar density enhancement of old stars in this arm. These and other features of this arm are consistent with the hypothesis that it corresponds to a spiral density wave. The same considerable density enhancement of old disk stars is observed in the regular symmetric arms of several other galaxies. This effect is explained in terms of a nonlinear gravitational theory of spiral density waves, which require the presence of a bar, a companion, or infall of gas clouds to maintain the spiral structure. Virtually all galaxies with regular spiral structure satisfy one of the above conditions, and our Galaxy satisfies all three.

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