Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993acasn..34..234h&link_type=abstract
Acta Astronomica Sinica (ISSN 0001-5245), vol. 34, no. 2, p. 234
Physics
Binary Stars, Brightness, Light Curve, Periodic Variations, Planetary Nebulae, Stellar Physics, Astronomical Photometry, Eclipses, Stellar Mass Ejection, Time Series Analysis
Scientific paper
In this paper we present the photographic photometry of V651 Mon during 1988-1989. The observations and the parameters of the light curves of V651 Mon are given. The photographic light curves we obtained in 1988 and 1989 are plotted. From these observations we find that the brightness variations of V651 Mon changed substantially from 1987 to 1988. The eclipse amplitude changed from about 0.4 mag. (1987) to 1.1 mag. (1988). And the 'eclipse' variations in the light curve appeared again in 1988 and the 'eclipse' roughly lasted 40% of the orbital period. The maximum brightness (Mpq) in 1988 was brighter than that in 1987. From the observations of 1989 it can be stated that the 'eclipse' event still existed in 1989. From these it is reasonable to think that the binary central star of planetary nebula V651 Mon might undergo another mass ejection from the subdwarf O component during 1987-1988.
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