Improved Distance Determination to SN 1987A and the LMC

Details Improved Distance Determination to SN 1987A and the LMC Improved Distance Determination to SN 1987A and the LMC

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1909p&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #19.09; Bulletin of the American Astronomical Society, Vol. 29, p.1243

Astronomy and Astrophysics

Astronomy

13

Scientific paper

Using the new reductions of the IUE light curves by Sonneborn et al (1997, ApJ, 477, 848) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al (1991, ApJ, 380, L23) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ring Rabs = (6.17 +/- 0.18) x 10(17) cm and an angular size R(") = 808 +/- 17 mas, which give a distance to the supernova d(SN1987A) = 50.9 +/- 1.8 kpc and a distance modulus m-M(SN1987A) = 18.53 +/- 0.08. 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)=51.5+/-1.9 kpc, which corresponds to a distance modulus of m-M(LMC) = 18.56 +/- 0.08.

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