Variable Stars in the 21st Century: From Microvariability to Megavariability

Dear Colleagues,

Variable stars are the most important objects of astrophysics because their observable behavior provides valuable information on their evolutionary state and internal characteristics. In addition, they are not rare, instead, rather ubiquitous. Nowadays, more than 10 million variable stars are known—a fact expressed as megavariability in the title of this Special Issue. Moreover, we can detect variability pertaining to amplitudes as tiny as several millionth of a magnitude, which is considered as microvariability.

It is not an exaggeration to state that each star is a variable star, though both the time scale and the range of variability span very wide intervals.

With this Special Issue, the Editors' goal is to demonstrate how diversified and picturesque are the variable star studies—from investigations of a single variable object to general results obtained for a large group of a similar type of variable stars. Binarity is also a main driver of stellar variability phenomena.

The research papers to be submitted for this Special Issue can be based on observations carried out in any region of the electromagnetic spectrum as far as variability is found in the studied object and the data are analyzed properly and reliably.

To attract the attention of the astronomer community, several invited reviews will also be published that will summarize the variability-related results of recent major sky surveys.

Prof. Dr. Laszlo Szabados
Dr. Tamas Szalai
Guest Editors

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• stellar variability
• sky surveys
• time-domain astrophysics
• astrophysical transients
• individual variable stars