UBV photometry of Sakurai's object in 1996 and remarks about its evolutionary status

Details UBV photometry of Sakurai's object in 1996 and remarks about its evolutionary status UBV photometry of Sakurai's object in 1996 and remarks about its evolutionary status

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..623a&link_type=abstract

Astronomy Letters, Volume 23, Issue 5, September 1997, pp.623-627; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 709

Astronomy and Astrophysics

Astronomy

4

Scientific paper

The UBV observations of Sakurai's star over 30 nights in 1996 revealed a systematic reddening of this object by 0.4 in B-V. The spectral type, which was determined from B-V on the scale of supergiants, changed from F1-2 in February to G0-2 in October. Light fluctuations with an amplitude that increased with time were observed. The luminosity of the star was essentially constant and equal to 3600L. The observations qualitatively confirm the evolutionary status of Sakurai's object as being the nucleus of a planetary nebula during the final helium-shell flash, but there are quantitative differences. A comparison with the evolution of FG Sge is made.

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