S0's and the lower limit of star-formation rates in disk galaxies

Details S0's and the lower limit of star-formation rates in disk galaxies S0's and the lower limit of star-formation rates in disk galaxies

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1186c&link_type=abstract

The Astronomical Journal, vol. 108, no. 4, p. 1186-1190

Astronomy and Astrophysics

Astronomy

11

Astronomical Photometry, Disk Galaxies, Galactic Evolution, H Alpha Line, H Ii Regions, Star Formation, Star Formation Rate, Stellar Luminosity, Stellar Spectra, Astronomical Spectroscopy, Fabry-Perot Spectrometers, Spectroscopic Telescopes

Scientific paper

As an extension of our study of star formation and H II regions in Sa galaxies, we have observed eight disk galaxies classified S0-S0/Sa. We have detected discrete H II regions in three of these, all classified S0/Sa because their faint star-forming regions are visible on broadband images. Each of these galaxies has about 15 H II regions, with a total luminosity in H-alpha between L = 1038.3 and 1037.7 ergs/s. The star-formation rate in these galaxies implied by the H-alpha luminosity is less than 0.004 solar mass/yr, as comparted to greater than 0.1 solar mass/yr in Sa galaxies. We conclude that normal star formation in disk galaxies can occur in exceedingly small amounts.

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