Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161...89s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 89-101. SNSF-supported research.
Astronomy and Astrophysics
Astronomy
226
Galactic Evolution, Galactic Structure, Interstellar Gas, Star Formation, Star Formation Rate, Dwarf Galaxies, Hydrogen Clouds, Local Group (Astronomy), Magellanic Clouds, Stellar Mass, Virgo Galactic Cluster, White Dwarf Stars
Scientific paper
The fraction of the mass ever made into stars that is forever locked-up in those stars is calculated. The shape of the integrated birth rate (IBR) and the integrated lock-up rate (ILUR) functions as the termination mass at the faint end of the initial mass function (IMF) is varied is discussed. The observed IBR and the derived ILUR for the LMC, SMC, and Sextans A galaxies are listed. The time to consume the remaining gas in LMC, SMC, and Sextans A, and the factor by which this time can be increased if bimodal star formation exists for various faint termination masses, MT, of the IMF is given. An empirical calibration of the Scoville and Young (1983) method of obtaining the IBR (and from it, the ILUR) using the total luminosity of the young stars is given. Application of these calculations to the Virgo cluster Sm/Im dwarfs is presented. The gas consumption times for bimodal star formation with Mi(limit) = 2 M_sun; are set out. Finally, the evolution of the Hubble sequence with time for various Hubble types is discussed in terms of the time variation of the star formation rate.
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