Long-term luminosity variations and period changes in CG Cygni
Articles > Article · 2004
Authors: Melike AFŞAR, P. A. Heckert, C. İbanoǧlu
Astronomy & Astrophysics, International, WoS, 2004, vol 420, pp 595-604
DOI: 10.1051/0004-6361:20040115
Summary
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 .