Astron observations of supernova 1987A in large magellanic cloud

Details Astron observations of supernova 1987A in large magellanic cloud Astron observations of supernova 1987A in large magellanic cloud

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rpsct....q..14b&link_type=abstract

In its JPRS Report: Science and Technology. USSR: Space p 14 (SEE N88-30498 24-88) Transl. into ENGLISH from Pisma v Astronomich

Astronomy and Astrophysics

Astrophysics

Brightness, Magellanic Clouds, Reference Stars, Saturn, Supernova 1987A, Attenuation, Hot Stars, Stellar Mass Ejection, Supergiant Stars

Scientific paper

The supernova 1987A flared in the Large Magellanic Cloud on 23 February 1987 and rapidly attained a brightness of about 4m. It was decided to observe it from the Astron astrophysical station, but since none of the 15 standard reference stars could be used, Saturn was chosen as a reference object. Four series of observations were made: 4, 6, 9, and 12 March. Observations ended when Saturn was no longer suitable for Astron orientation. During the observations there was an appreciable general attenuation of supernova brightness. On 12 March the radius of the photosphere was 24 a.u., exceeding the orbital radius of Uranus, and the mean rate of increase in photosphere radius from the time of the flare was close to 2400 km/s. Three strong absorptions (glgl2960, 3150, and 3260A) show up clearly on the registered spectra, but the strong blending caused by the great rate of expansion did not make it possible to draw any conclusions concerning the chemical composition of the emitting envelope. Supernova 1987A flared at the location of a hot star of the spectral class B3I, but no proof was obtained that a B3 supergiant had exploded. Special efforts were made to find traces of such a hot object on the registered spectra, but no evident traces of the spectrum of a hot star were discovered.

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