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

Published online by Cambridge University Press:  13 January 2020

G. Zsidi
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
Á. Kóspál
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected] Max Planck Institute for Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany
P. Ábrahám
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
R. Szabó
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
B. Cseh
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
K. Sárneczky
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
Á. Sódor
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
R. Szakáts
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
K. Vida
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
J. Vinkó
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences, Konkoly-Thege Miklós út 15-17, H1121, Budapest, Hungary email: [email protected]
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Abstract

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

Type
Contributed Papers
Copyright
© International Astronomical Union 2020 

References

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