Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...449l..51y&link_type=abstract
Astrophysical Journal Letters v.449, p.L51
Astronomy and Astrophysics
Astronomy
45
Stars: Evolution, Stars: Supernovae: General, Stars: Supernovae: Individual Alphanumeric: Sn 1993J, Stars: Supernovae: Individual Alphanumeric: Sn 1994I
Scientific paper
Numerical light curve calculations have been carried out to constrain the light-curve parameters of the recent SNs 1993J and 1994I. For SN 1993J the radius of the progenitor star is constrained to be in the range 2--4 x 1013 cm which is consistent with the candidate progenitor star. The ejected mass is constrained to be in the range 1.9--3.5 M&sun; equating the ejected mass to the helium core mass of the progenitor implies a main-sequence mass in the range 12--17 M&sun;. Using the new Cepheid distance to M81, the ejected 56Ni mass is found to be in the range 0.10--0.14 M&sun;. For SN 1994I the ejected mass is in the range 0.9--1.3 M&sun; equating the ejected mass to the carbon-oxygen core mass of the progenitor implies a main-sequence mass in the range 13--20 M&sun;. For a distance of 7 Mpc and an extinction AV = 1.4 mag, the ejected 56Ni mass is found to be 0.07 M&sun;. Recent studies of galactic chemical evolution have suggested that the main-sequence masses and ejected 56{Ni} masses of core collapse SNs may be inversely correlated. We examine this effect for 1993J, 1994I, and 1987A, but the small number of known nickel mass--main-sequence mass systems makes it too early to draw definitive conclusions.
Baron Eddie
Branch David
Young Timothy R.
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