Volume 376, Number 1, September II 2001
|Page(s)||224 - 231|
|Section||Interstellar and circumstellar matter|
|Published online||15 September 2001|
Cyclicities in the light variations of S Doradus stars
III. P Cygni
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
2 University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium
3 Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands
Corresponding author: C. Sterken, email@example.com
Accepted: 2 July 2001
On the basis of new photometric observations and archived data published since 1907, we discuss the light variations of P Cygni. We conclude that there are α Cygni-type microvariations with a stable (pulsation) quasi-period of 17.3 days. There are also longer cycles of variation with 100 d, so-called 100 d-type micro-variations, and with -1600 d, a short S Dor-type phase.
Key words: stars: individual: P Cyg / stars: variables: general / stars: oscillations / stars: supergiants
© ESO, 2001
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