Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..467m&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.467-477.
Astronomy and Astrophysics
Astronomy
3
Galaxy: Abundances, Galaxies: Evolution, Galaxies: Mass-Luminosity Ratio, Galaxies: Milky Way, Supernovae
Scientific paper
We have investigated the chemical evolution of the solar neighborhood with a particular emphasis on the helium abundance and the current supernova (SN) rate, while taking into account the effects of the stellar mass loss on nucleosynthesis in stars. We found that the Scalo IMF can reproduce the solar-helium abundance as well as the current ratio of type-Ia to type-(Ib+II) SNe for a suitable choice of the close-binary fraction. A current type-Ia to type-(Ib+II) SNe ratio as low as 0.1 is favored in order to reproduce the solar-iron abundance. We have noticed that there exists a method to estimate the mass-to-luminosity ratio of our Galaxy and the Hubble constant by assuming that the current SNe rate of our Galaxy is the same as that of external Sbc galaxies. By combining our best model prediction, M/LB = 12.3h(2) , with the observed value, M/LB = 7.6h, we obtained M/LB = 4.7 and H_0 ~ 62 \ [{km\ {s(-1) {Mpc}(-1}}) ] with a fairly large uncertainty.
Mihara Kuniko
Takahara Fumio
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