Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180...12d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 12-26. CNES-SNSF-supported research.
Astronomy and Astrophysics
Astronomy
116
Astronomical Photometry, Irregular Galaxies, Spiral Galaxies, Star Formation Rate, Stellar Evolution, Ultraviolet Astronomy, Balloon-Borne Instruments, Calibrating, Color-Color Diagram, Data Reduction, Galactic Evolution, Hydrogen, Morphology
Scientific paper
The present 149 galaxies, essentially of spiral and irregular types were observed at about 2000 A in a survey using a balloon-borne imaging telescope. Total ultraviolet fluxes in an about 125-A wide bandpass have been obtained by comparison with field stars. On average, the m(2000)-B color gets redder from late to early morphological types. For a given type, this color exhibits a large scatter which increases from late to early types. As expected, the galaxies show a relation between the m(2000)-B and B-V colors. After a correction for dust extinction based on the neutral hydrogen content of each galaxy, the observed fluxes are used to obtain quantitative estimates of the current star formation rate (SFR). A good correlation is found between the SFR and the total gas content. A weak correlation observed between the SFR per unit area and the average gas surface density might be compatible with the existence of a power-law relation of exponent 1, between birthrate and gas density. The SFR per unit gas mass shows both a significant dispersion and a decrease toward later types. Implications in terms of star formation history are discussed.
Deharveng Jean Michel
Donas Jose
Huguenin Daniel
Laget Michel
Milliard Bruno
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