Publikace ÚTF

The ASAS-SN catalogue of variable stars III: variables in the southern TESS continuous viewing zone

Pejcha, etal

The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long-baseline (∼4 yr)
light curves for sources brighter than V  17 mag across the whole sky. The Transiting
Exoplanet Survey Satellite (TESS) has started to produce high-quality light curves with a
baseline of at least 27 d, eventually for most of the sky. The combination of ASAS-SN and TESS
light curves probes both long- and short-term variability in great detail, especially towards the
TESS continuous viewing zones (CVZ) at the ecliptic poles. We have produced ∼1.3 million
V-band light curves covering a total of ∼1000 deg2 towards the southern TESS CVZ and have
systematically searched these sources for variability. We have identified ∼11 700 variables,
including ∼7 000 new discoveries. The light curves and characteristics of the variables are all
available through the ASAS-SN variable stars data base (
We also introduce an online resource to obtain pre-computed ASAS-SN V-band light curves
( starting with the light curves of the ∼1.3 million sources
studied in this work. This effort will be extended to provide ASAS-SN light curves for
∼50 million sources over the entire sky
journal:Mon. Not. Roy. Astron. Soc.

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