Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-04-28
MNRAS Letters, 2011
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
6 pages, 4 figures, accepted
Scientific paper
We use H-alpha images of three clumps of young stars situated between M81 and NGC3077 to estimate their star formation rate. Radial velocities of the clumps measured by us, as well as the velocity of HII-region in the dSph galaxy KDG61 are compatible with their location at the outskirts of a large rotating gaseous disc around M81. In contrast to KDG61, radial velocity of the emission knot in the dSph galaxy DDO44, +213+-25 km/s, tells us that this H-alpha spark belongs to the dSph galaxy itself. F475W and F814W images of DDO44 extracted from the HST archive reveal 8 bluish (B-I < 0.8) stars apparently associated with the H-alpha knot.
Kaisin Serafim
Kaisina Elena
Karachentsev Igor
Makarova Lidia
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