Brightness variations of young Sun-like stars from ground-based and space telescopes

Zsidi, G. and Kóspál, Á. and Ábrahám, P. and Szabó, R. and Cseh, B. and Sárneczky, K. and Sódor, Á. and Szakáts, R. and Vida, K. and Vinkó, J. (2020) Brightness variations of young Sun-like stars from ground-based and space telescopes. PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION, 14. pp. 380-382. ISSN 1743-9213 (print); 1743-9221 (online)

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Abstract

Young stellar objects often show photometric variability, which is well examined at optical wavelengths, but more and more infrared data ar also available. The wavelength dependence of the variability carrie information on the physical cause of the changing brightness. Here, w examine seven T Tauri-type stars known for their large amplitud variability selected from the Campaign 13 field of the Kepler K mission. We complemented the K2 light curves by multifilter optica monitoring observations made with the 90 cm Schmidt telescope of Konkol Observatory, and by 3.6 and 4.5 μm infrared photometry with a 20 hour cadence using the Spitzer Space Telescope. We found that the wavelengt dependence of the observed variability is not consistent with changin interstellar extinction. We suggest that the brightness changes are du to variable accretion, causing a variable illumination of the inne disk.

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