Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1240w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 693, p. 1240-1249
Astronomy and Astrophysics
Astronomy
21
Astronomical Photometry, Astronomical Spectroscopy, B Stars, Companion Stars, Supernova 1987A, Infrared Spectra, Spectrum Analysis, Stellar Magnitude, Ultraviolet Spectra, Visible Spectrum
Scientific paper
The spectra of both close companion stars to SN 1987A in the Large Magellanic Cloud (LMC) have been classified as type B2 from blue-violet digital data; the H-gamma equivalent width of Star 2 and the absolute visual magnitudes of both stars correspond to giant luminosity classes. The near-ultraviolet, visual, and infrared colors of Star 2 are found to be consistent with the classification, but Star 3 exhibits both UV and IR excesses as well as variable magnitudes, which are consistent with a Be object, as recently reported from the presence of broad H-alpha emission. Paradoxically, Star 2 has relatively broad, shallow absorption lines indicative of a moderately rapid rotator, whereas Star 3 has sharper lines, indicating that it is viewed pole-on. The derived evolutionary ages of the companions correspond roughly to coevality with Sk--69 deg 202, the B3 I progenitor of SN 1987A, but the discrepancies and uncertainties in current Teff, Mbol calibrations unfortunately render this conclusion somewhat indefinite.
Elias Jonathan H.
Phillips Mark M.
Walborn Nolan R.
Walker Alistair R.
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