Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188....5h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 5-12. DFG-supported research.
Astronomy and Astrophysics
Astrophysics
18
Astronomical Spectroscopy, Dwarf Galaxies, Galactic Structure, Irregular Galaxies, Star Distribution, Star Formation, Binary Stars, Charge Coupled Devices, Color-Magnitude Diagram, Galactic Evolution, Interstellar Matter, Supergiant Stars
Scientific paper
The authors present CCD images in B, R, I, Hα and long-slit spectroscopy of Ho IX, a dwarf irregular galaxy situated close to M81. Photometry of the resolved stars to magnitude limits of B = 23m.8, R = 23m.8, and I = 23m.0 is used to construct colour-magnitude and colour-colour diagrams. The authors also discuss the photometry of the background light distribution of the subthreshold stars. A revised distance modulus of m-M = 30m is estimated. The blue, high-mass stars are concentrated towards the center of the galaxy and in at least three OB associations. The blue-to-red supergiant ratio indicates a more or less constant star formation rate within the last 107yr. It is proposed that Ho IX has just entered a quiescent phase of its star formation due to lack of interstellar material.
Hopp Ulrich
Schulte-Ladbeck Regina E.
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