An All-Sky Search For R Coronae Borealis Stars in ASAS-SN

Monthly Notices of the Royal Astronomical Society

et al. 2019

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161

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The variable stars in the VSX catalog are derived from a multitude of inhomogeneous data sources and classification tools. This inhomogeneity complicates our understanding of variable star types, statistics, and properties, and it directly affects attempts to build training sets for current (and next) generation all-sky, time-domain surveys. We homogeneously analyze the ASAS-SN V-band light curves of ∼412, 000 variables from the VSX catalog. The variables are classified using an updated random forest classifier with an F 1 score of 99.4% and refinement criteria for individual classifications. We have derived periods for ∼44, 000 variables in the VSX catalog that lack a period, and have reclassified ∼17, 000 sources into new broad variability groups with high confidence. We have also reclassified ∼94, 000 known variables with miscellaneous/generic classifications. The light curves, classifications, and a range of properties of the variables are all available through the ASAS-SN variable stars database (https://asas-sn.osu.edu/variables). We also include the V-band light curves for a set of ∼4, 000 rare variables and transient sources, including cataclysmic variables, symbiotic binaries and flare stars.

Section: Rare Variablesmentioning

confidence: 99%

The ASAS-SN Catalog of Variable Stars II: Uniform Classification of 412,000 Known Variables

Monthly Notices of the Royal Astronomical Society

et al. 2019

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161

129

“…We have also explored the synergy between ASAS-SN and APOGEE (Holtzman et al 2015) with the discovery of the first likely non-interacting binary composed of a black hole with a field red giant (Thompson et al 2018) and a detailed variability analysis of the APOGEE sources to identify 1914 periodic variables (Pawlak et al, in prep). We have also identified rare variables, including 2 very long period detached eclipsing binaries (Jayasinghe et al 2018c,d) and 19 R Coronae Borealis stars (Shields et al 2018) .…”

mentioning

confidence: 90%

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

Monthly Notices of the Royal Astronomical Society

et al. 2019

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161

The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (∼4 yrs) 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 days, 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 deg 2 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 database (https://asas-sn.osu.edu/variables). We also introduce an online resource to obtain pre-computed ASAS-SN V-band light curves (https://asas-sn.osu.edu/photometry) 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.

“…We have also explored the synergy between ASAS-SN and APOGEE (Holtzman et al 2015) with the discovery of the first likely non-interacting binary composed of a black hole with a field red giant (Thompson et al 2018) and we identified 1924 APOGEE stars as periodic variables in Paper IV (Pawlak et al 2019). We have also identified rare variables, including 2 very long period detached eclipsing binaries (Jayasinghe et al 2018b,c) and 19 R Coronae Borealis stars (Shields et al 2018).…”

mentioning

confidence: 89%

The ASAS-SN catalogue of variable stars – V. Variables in the Southern hemisphere

Monthly Notices of the Royal Astronomical Society

et al. 2019

The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline (∼4 yrs) light curves for sources brighter than V 17 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 ∼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 ∼220, 000 variables, including ∼88, 300 new discoveries. In particular, we have discovered ∼48, 000 red pulsating variables, ∼23, 000 eclipsing binaries, ∼2, 200 δ-Scuti variables and ∼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 Vband light curves for all the ∼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 17 mag sources across the whole sky that are not included in APASS DR9.