Other
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1108c&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #11.08; Bulletin of the American Astronomical Society, Vol. 31, p.842
Other
Scientific paper
A study of the Type Ic SN 1990B, which exploded in the Sc galaxy NGC 4568, is presented. The work is based on observations from Cerro Tololo Interamerican Observatory, Lick Observatory, European Southern Observatory, and Asiago Observatory. The combined dataset comprises BV(RI)c CCD images at 20 epochs, spanning ~ 160 days after maximum light, and 15 spectra from 8 up to 150 days after maximum light. The SN appeared on a complicated background, which was modeled and subtracted using images of NGC 4568 taken years after the explosion, when the SN light had faded beyond detection. The photometry done on the subtracted frames shows the light curves of SN 1990B to be of the slow Ic SN type, with a slope steeper than that of the Type Ib SN 1983N or the Type II-t SN 1993J. Line identifications based on comparison with other well studied SNe are proposed. Opposite to other Type Ic SNe, SN 1990B did not display the HeI lambda 5876 line implicating that its He content was smaller, or that the He layers were effectively yielded from the radioactive matter in the ejecta. The mass--to--energy ratio of SN 1990B, relative to those of other Type Ib/c SNe is computed, both from spectroscopic and photometric criteria, indicating that, for a constant energy deposited by the explosions, the mass in the ejecta of SN 1990B was smaller than those of other slow Ic SN events. Finally, by using two estimates of the foreground reddening, a bolometric light curve of SN 1990B is computed. AC acknowledges the support of CONICYT, Chile, under FONDECYT grant 1980803.
Clocchiatti Alejandro
Filippenko Alexei V.
Phillips Marcia
Turatto Massimo
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