Multiwavelength variability in CAL 83.
Abstract
CAL 83 is a supersoft X-ray source in the LMC that exhibits multiwavelength variability on a wide range of time-scales. The optical magnitude shows quasi-periodic variability with a period of ∼450 d, an orbital modulation of just more than a day, and also possible QPOs associated with an accretion disc. The X-ray lightcurves exhibit large-amplitude modulations, including periodicities ranging from 67 s to hours. The X-ray variability is accompanied by temperature changes, and is anti-correlated with the optical behaviour.
Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 2015
- Bibcode:
- 2015MmSAI..86..102O
- Keywords:
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- Stars: individual: CAL 83;
- X-rays: binaries;
- White dwarfs;
- Stars: oscillations;
- Accretion;
- accretion discs