Properties of star 2, one of the two SN 1987A companion, derived from HST-FOS observations

Details Properties of star 2, one of the two SN 1987A companion, derived from HST-FOS observations Properties of star 2, one of the two SN 1987A companion, derived from HST-FOS observations

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7914s&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #79.14; Bulletin of the American Astronomical Society, Vol. 26, p.1446

Astronomy and Astrophysics

Astronomy

Scientific paper

We present and discuss the HST Faint Object Spectrograph observations of star 2, one of the two companions of SN 1987A. Our analysis reveals that star 2 is a B1III star, whose reddening corresponds to E(B-V)=0.19+/-0.01. Star 2 has an effective temperature of Teff=23000+/-1000 K and a luminosity of logL/L_sun=4.43+/-0.08. Also, star 2 appears to rotate with an equatorial velocity of v sin(i)=275+/-50 km s(-1) , and is presently undergoing mass loss at a rate of log dot {M} = -6.8+/-0.3 M_sun yr(-1) . Judging from its position in the HR 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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