A&A 421, 833-837 (2004)
DOI: 10.1051/0004-6361:20047080

The stellar content of the ring in NGC 660

G. M. Karataeva^{1, 2}, N. A. Tikhonov^{3, 4}, O. A. Galazutdinova^{3, 4}, V. A. Hagen-Thorn^{1, 2} and V. A. Yakovleva<sup>1, 2

1</sup>  Astronomical Institute, St. Petersburg State University, Universitetsky pr., 28 Petrodvoretz, St. Petersburg 198504, Russia
²  Isaac Newton Institute of Chile, St. Petersburg Branch
³  Special Astrophysical Observatory, N. Arkhyz, Karachai-Circassian Rep. 369167, Russia
⁴  Isaac Newton Institute of Chile, SAO Branch

(Received 15 January 2004 / Accepted 27 February 2004)

Abstract
We present the results of stellar photometry of the polar-ring galaxy NGC 660 using the Hubble Space Telescope's archival data obtained with the Wide Field Planetary Camera 2. The final list of the resolved stars contains 550 objects, a considerable part of which are blue and red supergiants belonging to the polar ring. The analysis of the Colour-Magnitude Diagram for polar ring stars shows that it is best represented by the isochrones with metallicity Z = 0.008. The process of star formation in the polar ring was continuous and the age of the youngest detected stars is about 7 Myr.

Key words: galaxies: individual: NGC 660 -- galaxies: peculiar -- galaxies: starburst -- galaxies: stellar content

Offprint request: G. Karataeva, narka@astro.spbu.ru

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© ESO 2004

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