Optical variability of SAO 91772: A serendipitous X-ray source

Details Optical variability of SAO 91772: A serendipitous X-ray source Optical variability of SAO 91772: A serendipitous X-ray source

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..756r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 3, p. 756-758

Astronomy and Astrophysics

Astronomy

5

Chromosphere, Stellar Evolution, Variability, Variable Stars, X Ray Astronomy, X Ray Binaries, Astronomical Photometry, Emission Spectra, Light Curve, Photosphere, Stellar Color, Stellar Luminosity, Stellar Rotation

Scientific paper

During the course of systematic observations of known or suspected chromospherically active stars carried out at Catania Astrophysical Observatory by a 0.8-m Automated Photometric Telescope (APT), the variability of SAO 91772, the optical counterpart of the serendipitous X-ray source 1E0009.0+1417, was discovered. We detected a quasi-sinusoidal variation with a period of 1.84 +/- 0.02 days and a V-band peak-to-peak amplitude of about 0.08 magnitudes. The variation of the color indices suggests that the light change is due to photospheric cool spots, whose visibility on the projected stellar disk facing the observer is modulated by the star rotation. Moreover, long-term variability of the global spot covering factor is strongly suspected.

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