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A Geometric Determination of the Distance to SN 1987A and the LMC

Published online by Cambridge University Press:  19 September 2016

Nino Panagia
Nino Panagia*
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA;panagia@stsci.edu Affiliated with the Space Telescope Division of the European Space Agency, ESTEC, Noordwijk, Netherlands

Summary

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Using the definitive reductions of the IUE light curves by [15] and an extensive set of HST images of SN 1987A we have repeated and improved our original analysis [8, 9] to derive a better determination of the distance to the supernova. In this way we have obtained an absolute size of the ring Rabs = (6.23 ± 0.08) × 1017 cm and an angular size R″ = 808 ± 17 mas, which give a distance to the supernova d(SN1987A) = 51.4±1.2 kpc and a distance modulus (m − M)sN1987A = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to be d(LMC) = 51.7±1.3 kpc, which corresponds to a distance modulus of (m − M)LMC = 18.56 ± 0.05.

Type
Part VIII Supernovae, Gamma-Ray Bursters, and Cosmology
Information
International Astronomical Union Colloquium , Volume 192: Cosmic Explosions , 2005 , pp. 585 - 592
Copyright
Copyright © Springer-Verlag 2005

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