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Astron. Astrophys. 349, 877-886 (1999)

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SN 1994D in NGC 4526: a normally bright type Ia supernova

Georg Drenkhahn 1,2 and Tom Richtler 1

1 Sternwarte der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany (richtler@astro.uni-bonn.de)
2 Max-Planck-Institut für Astrophysik, Postfach 1523, D-85740 Garching bei München, Germany (georg@mpa-garching.mpg.de)

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 [FORMULA] mag in V and [FORMULA] mag in I. The corresponding distance modulus is [FORMULA] mag, where the error reflects our estimation of the absolute distance scale. The absolute magnitudes (not corrected for decline rate and colour) are [FORMULA] mag, [FORMULA] mag, and [FORMULA] mag for B, V, and I, respectively. The corrected magnitudes are [FORMULA] mag, [FORMULA] mag, and [FORMULA] 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