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Astron. Astrophys. Suppl. Ser.
Volume 119, Number 3, November I 1996
Page(s) 499 - 507
Published online 15 November 1996
Photometric distances to NGC 628 and its four companions DOI: 10.1051/aas:1996262

Astronomy and Astrophysics Supplement Series, Vol. 119, November I 1996, 499-507

Photometric distances to NGC 628 and its four companions

M.E. Sharina , I.D. Karachentsev and N.A. Tikhonov
Send offprint requests to: I.D. Karachentsev

Special Astrophysical Observatory, Russian Academy of Sciences, Zelenchukskaja,Stavropolsky kraj, 357147, Russia
Visiting astronomer at the Astronomical Observatory of Capodimonte, via Moiariello 16, I-80131, Napoli, Italy

Received February 28; accepted April 5, 1996


Based on photometry of the brightest blue stars we derived distance moduli for NGC 628 and its dwarf irregular companions: DDO 13, UGC 1171, UGC 1104, and K 10. The mean modulus of the group is estimated to be 29.46 mag with a formal (internal) error of 0.11. The total mass to luminosity ratio of 40 seems sufficient for NGC 628 to keep its companions in bound orbits.

Key words: galaxies: NGC 628; distances and redshifts; irregular

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