Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1101f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 1101-1112.
Other
51
Astronomical Photometry, Charge Coupled Devices, Light Curve, Supernovae, Astronomical Observatories, Interstellar Extinction, Peculiar Stars, Stellar Color, Stellar Magnitude
Scientific paper
Attention is given to Cousins system VRI photometry obtained for the Type Ia supernova 1992G with CCDs attached to small telescopes at Leuschner Observatory, Van Vleck Observatory (VVO), and Whitin Observatory. Two other Type Ia supernovae, 1991M and 1991T, were observed only at VVO. The I template shows a secondary maximum 23 +/- 1 d after the primary peak, similar to what is seen in normal Type Ia supernovae at J, H, and K wavelengths. The behavior in R is intermediate between V and I. The observed colors of SN 1991M and SN1991T as a function of time are quite similar, indicating that they suffer about the same amount of reddening. If Type Ia supernovae are assumed to be good standard candles, then NGC 4527, the parent galaxy of SN 1991T, must have a peculiar velocity of 1200 +/- 150 km/s relative to the Hubble flow and directed away from the galaxy. If the peculiar velocity of NGC 4527 is less than this, then SN 1991T must be an overluminous SN Ia.
Baker Michael L.
Benson Priscilla J.
Filippenko Alexei V.
Ford Charles H.
Herbst William
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