Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743425c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #434.25; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
I shall present spectroscopic observations of HII regions in host galaxies of 24 low redshift Type II plateau supernovae (SNe IIP). SNe IIP show a wide range of their observed properties (plateau luminosities, tail luminosities, and expansion velocities) and their physical parameters (explosion energies, ejected masses, initial radii, and 56Ni yields). Using the HII regions emission-line measurements corrected for stellar absorption and extinction, we derive oxygen abundances at the SNe position. When no HII region was possible to observe at the SNe position, we opted to observe bright HII regions located nearby. The oxygen abundances are derived using empirical, theoretical and combined metallicity calibrations summarized on Kewley and Ellison (2008). We compare the optical luminosity of our SNe sample with the abundances measured and performed a Spearman rank correlation test to the optical luminosity calculated during the plateau phase versus oxygen abundance for all these methods. We find a slight suggestion of a correlation for all the methods, in terms of increasing progenitor luminosity with increasing metallicity. This might be an indication that low luminosity SNe IIP were born in a lower metallicity environment than those with higher luminosities.
Covarrubias Ricardo Alberto
Dalcanton Julianne J.
Hamuy Mario
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