P Cygni: Four Centuries of Photometry

Details P Cygni: Four Centuries of Photometry P Cygni: Four Centuries of Photometry

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aspc..233...15d&link_type=abstract

P Cygni 2000: 400 Years of Progress, ASP Conference Proceeding Vol. 233, Edited by M. de Groot and C. Sterken, San Francisco: As

Astronomy and Astrophysics

Astronomy

4

Scientific paper

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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