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Paper: P Cygni: Four Centuries of Photometry
Volume: 233, P Cygni 2000: 400 Years of Progress
Page: 15
Authors: de Groot, M.; Sterken, C.; van Genderen, A. M.
Abstract: The light variations of P Cygni over two distinct time intervals are discussed. On the basis of new photometric observations obtained between 1985 and 2000 we conclude that there are alpha Cygni-type micro-variations with a relatively stable period of ~17.3 days. There are also longer cycles of variation with P 100 d, so-called 100-day micro-variations, and with P 1500-1600 d, a short S Dor-type phase. On the basis of a new analysis of P Cygni's 17th century brightness variations and a comparison with the 19th century light curve of eta Carinae, it is estimated that the mass ejected during the 1600 and 1655 outbursts amounted to 2.6 10-2 Mo.
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