| Issue |
A&A
Volume 376, Number 1, September II 2001
|
|
|---|---|---|
| Page(s) | 224 - 231 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010960 | |
| Published online | 15 September 2001 | |
Cyclicities in the light variations of S Doradus stars
III. P Cygni
1
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, csterken@vub.ac.be
Received:
19
April
2001
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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