Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237...79b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 79-90.
Astronomy and Astrophysics
Astrophysics
159
Light Curve, Stellar Radiation, Supernovae, Velocity Measurement, Astronomical Photometry, Astronomical Spectroscopy, Ccd Star Tracker, Color-Color Diagram, Ejecta
Scientific paper
Photometry and spectroscopy of SN 1989B in NGC 3627 are presented and discussed. The results show that the star represents another classical example of the Ia subtype. The sole photometric peculiarity observed is the narrowness of the peak of the blue light curve and also the short duration of its maximum and the fast early decline. The (B-V) color curve of this SN, when compared with the average color curve of SNe-Ia, indicates a color excess of about +0.8 mag, very likely due to local obscuring material. The heliocentric velocity of the galaxy at the location of the SN is determined to be +635 + or - 20 km/s. A series of spectra obtained during the first months after maximum permits the SN evolution to be followed step by step. Nothing abnormal is found from comparisons with other SNe of the same type, except an evolution somewhat faster and an expansion velocity of the ejecta lower than average. The absolute magnitude of this SN appears to be in good agreement with that of SNe of the same type.
Barbon Roberto
Benetti Stefano
Cappellaro Enrico
Rosino Leonida
Turatto Massimo
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