The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (${ \sim}4$ yrs) light curves for sources brighter than V$\lesssim17$ mag across the whole sky. As part of our effort to characterize the variability of all the stellar sources visible in ASAS-SN, we have produced ${ \sim}30.1$ million V-band light curves for sources in the southern hemisphere using the APASS DR9 catalog as our input source list. We have systematically searched these sources for variability using a pipeline based on random forest classifiers. We have identified ${ \sim} 220,000$ variables, including ${ \sim} 88,300$ new discoveries. In particular, we have discovered ${ \sim}48,000$ red pulsating variables, ${ \sim}23,000$ eclipsing binaries, ${ \sim}2,200$ $\delta$-Scuti variables and ${ \sim}10,200$ rotational variables. The light curves and characteristics of the variables are all available through the ASAS-SN variable stars database (https://asas-sn.osu.edu/variables). The pre-computed ASAS-SN V-band light curves for all the ${ \sim}30.1$ million sources are available through the ASAS-SN photometry database (https://asas-sn.osu.edu/photometry). This effort will be extended to provide ASAS-SN light curves for sources in the northern hemisphere and for V$\lesssim17$ mag sources across the whole sky that are not included in APASS DR9.
Categories: astro-ph.SR