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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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