| Issue |
A&A
Volume 420, Number 2, June III 2004
|
|
|---|---|---|
| Page(s) | 595 - 604 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20040115 | |
| Published online | 28 May 2004 | |
Long-term luminosity variations and period changes in CG Cygni*
1
Ege University, Science Faculty, Department of Astronomy and Space Sciences, Bornava, Izmir 35100, Turkey e-mail: ibanoglu@astronomy.sci.ege.edu.tr
2
Western Carolina University, Department of Chemistry and Physics, Cullowhee, NC 28723, USA e-mail: heckert@email.wcu.edu
Corresponding author: M. Afşar, afsar@astronomy.sci.ege.edu.tr
Received:
27
August
2003
Accepted:
16
February
2004
We report new photometry of CG Cyg from 1998–2002.
We also analyze published photometry collected since 1965. An O–C analysis
reveals evidence of a third body in the system having a 51 year orbital
period. After removing the effects of the third body, we note a remaining 22.5 year cyclic variation in the O–C curve that is similar to the period of the
luminosity variations. Modeling the spot activity for 28 V band light curves
obtained between 1965 and 2002 confirms the presence of two active longitude
belts (ALBs) at approximately 
and 
. Most of the spots occur at mid
latitudes with a few at low latitudes. We note no spots at latitudes greater
than 
.
Key words: stars: activity / stars: binaries: eclipsing / stars: individual: CG Cyg / stars: starspots
© ESO, 2004
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