Properties of Star 2, One of the SN 1987A Companions, Derived from Hubble Space Telescope--Faint Object Spectrograph Observations

Details Properties of Star 2, One of the SN 1987A Companions, Derived from Hubble Space Telescope--Faint Object Spectrograph Observations Properties of Star 2, One of the SN 1987A Companions, Derived from Hubble Space Telescope--Faint Object Spectrograph Observations

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465..956s&link_type=abstract

Astrophysical Journal v.465, p.956

Astronomy and Astrophysics

Astronomy

34

Stars: Fundamental Parameters, Stars: Evolution, Stars: Early-Type, Stars: Binaries: Visual, Ism: Dust, Extinction, Stars: Supernovae: Individual Alphanumeric: Sn 1987A

Scientific paper

We present and discuss the Hubble Space Telescope Faint Object Spectrograph observations of Star 2, one of the two companions of SN 1987A, in the range 1200-8000 A. Our analysis, based on a comparison of the observed spectrum with spectra of O and B type stars and with model atmospheres, confirms that Star 2 is a B2III star. The extinction toward Star 2 is mostly of LMC origin and amounts to an E(B - V) = 0.19 +/- 0.02. The detailed extinction curve has a 2200 A bump less pronounced than the average LMC extinction law. Star 2 has an effective temperature of T_eff_ = 22000 +/- 2000 K and a luminosity of log L/L_sun_ = 4.38 +/- 0.11. Also, Star 2 appears to rotate with an equatorial velocity of ν sin i = 250+/-50 km s^-1^ and is presently undergoing mass loss at a range of log M ~ -7.0 /-+ 0.5 M_sun_ yr^-1^. Judging from its position in the H-R diagram and its present parameters, Star 2 had an original mass of about 13 M_sun_ and was born less than 13 Myr ago, which makes Star 2 coeval to the SN 1987A progenitor Sk 69^deg^202.

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