SN1994D in NGC4526: a normally bright type Ia supernova

Details SN1994D in NGC4526: a normally bright type Ia supernova SN1994D in NGC4526: a normally bright type Ia supernova

1999-07-26

arxiv.org/abs/astro-ph/9907345v3

Astron.Astrophys.349:877,1999

Astronomy and Astrophysics

Astrophysics

11 pages, 9 figures. Accepted by A&A; corrected citations

Scientific paper

SN1994D 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, NGC4526, 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 23.16+-0.16mag in V and 21.96+-0.09mag in I. The corresponding distance modulus is 30.4+-0.3mag, where the error reflects our estimation of the absolute distance scale. The absolute magnitudes (not corrected for decline rate and colour) are -18.67+-0.30mag, -18.62+-0.30mag, and -18.40+-0.30mag for B, V, and I, respectively. The corrected magnitudes are -18.69+-0.31mag, -18.69+-0.31mag, and -18.44+-0.31mag. Compared with other supernovae with reliably determined distances, SN1994D fits within the errors. It is therefore not a counter-example against a uniform decline-rate-colour-brightness relation.

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