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Issue A&A
Volume 434, Number 3, May II 2005
Page(s) 935 - 938
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20052673



A&A 434, 935-938 (2005)
DOI: 10.1051/0004-6361:20052673

Research Note

H$\alpha$ imaging of the local volume galaxies

I. The NGC 6946 galaxy group
I. D. Karachentsev1, S. S. Kajsin1, Z. Tsvetanov2 and H. Ford2

1  Special Astrophysical Observatory, Russian Academy of Sciences, N.Arkhyz, KChR, 369167, Russia
    e-mail: ikar@luna.sao.ru
2  Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA

(Received 11 January 2005 / Accepted 11 February 2005)

Abstract
We present new H$\alpha$ imaging of all known dwarf irregular companions to NGC 6946: UGC 11583, KK 251, KK 252, KKR 55, KKR 56, Cepheus 1, KKR 59, and KKR 60. The galaxies span a range of blue absolute magnitudes of [ -13.6, -17.6] , relative gas content of [0.1, 2.5] $M_{\odot}/L_{\odot}$, current star formation activity of $[0.2, ~5.2]\times 10^{-2} ~M_{\odot}$ yr-1, and timescale to exhaust the current gas supply of [6, 86] Gyr.


Key words: galaxies: dwarf -- stars: formation

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