SN 1994D in NGC 4526: a normally bright type Ia supernova
Georg Drenkhahn 1,2 and
Tom Richtler 1
Received 17 March 1999 / Accepted 19 July 1999
SN 1994D of type Ia has been suspected not to fit into the relation between decline rate, colour, and brightness. However, an individual distance of its host galaxy, NGC 4526, other than that of the Virgo cluster, has not yet been published. We determined the distance by the method of globular cluster luminosity functions on the basis of HST archive data. A maximum-likelihood fit returns apparent turn-over magnitudes of mag in V and mag in I. The corresponding distance modulus is mag, where the error reflects our estimation of the absolute distance scale. The absolute magnitudes (not corrected for decline rate and colour) are mag, mag, and mag for B, V, and I, respectively. The corrected magnitudes are mag, mag, and mag.
Compared with other supernovae with reliably determined distances, SN 1994D fits within the errors. It is therefore not a counter-example against a uniform decline-rate-colour-brightness relation.
Key words: stars: supernovae: general stars: supernovae: individual: SN 1994D galaxies: individual: NGC 4526 Galaxy: globular clusters: general cosmology: distance scale
© European Southern Observatory (ESO) 1999
Online publication: September 13, 1999