| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 3, November I 1996
|
|
|---|---|---|
| Page(s) | 499 - 507 | |
| DOI | https://doi.org/10.1051/aas:1996262 | |
| Published online | 15 November 1996 | |
Photometric distances to NGC 628 and its four companions
1
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
Received:
28
February
1996
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