Photometric distances to NGC 628 and its four companions
Special Astrophysical Observatory, Russian Academy of Sciences, Zelenchukskaja,Stavropolsky kraj, 357147, Russia
2 Visiting astronomer at the Astronomical Observatory of Capodimonte, via Moiariello 16, I-80131, Napoli, Italy
Send offprint request to: I.D. Karachentsev
Accepted: 5 April 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
© European Southern Observatory (ESO), 1996