Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..173d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 1, 1984, p. 173-184.
Astronomy and Astrophysics
Astronomy
15
Dwarf Galaxies, Astronomical Photography, Astronomical Spectroscopy, Electrophotometry, Hydrogen, Luminosity
Scientific paper
An optical and H I study has been made of four dwarf galaxies near NGC 1023. Single-beam and aperture-synthesis data are given for the H I emission from all four galaxies and 4-m prime-focus plates have been taken of the field. Photoelectric photometry and intensified image-dissector-scanner spectral observations have been made of three of the objects. Knots are seen in each of the dwarfs; these could be supergiants at the plate limit. The spectrum of galaxy B indicates that it has a substantial stellar component with an age of less than about one-billion yr. Galaxy C shows emission features which imply that it contains star-forming regions less than about 7-million yr old. These results are suggestive of star bursts on a small scale. The integrated properties of the dwarf galaxies (M/H/, M/T/, L) are continuous with those of more luminous galaxies. The ratios M(H)/L and M(H)/M(T) increase logarithmically over the range M(B) = -20.5 to -13.0. M(T)/L does not change significantly over this range.
Davies Rhodri D.
Kinman Thomas D.
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