A survey for variable young stars with small telescopes : first results from HOYS-CAPS
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Variability in Young Stellar Objects (YSOs) is one of their primary characteristics. Long-term, multi-filter, high-cadence monitoring of large YSO samples is the key to understand the partly unusual light-curves that many of these objects show. Here we introduce and present the first results of the HOYS-CAPS citizen science project which aims to perform such monitoring for nearby (d <1 kpc) and young (age<10 Myr) clusters and star forming regions, visible from the northern hemisphere, with small telescopes. We have identified and characterised 466 variable (413 confirmed young) stars in 8 young,nearby clusters. All sources vary by at least 0.2 mag in V, have been observed at least 15 times in V, R and I in the same night over a period of about 2 yrs and have a Stetson index of larger than 1. This is one of the largest samples of variable YSOs observed over such a time-span and cadence in multiple filters. About two thirds of our sample are classical T-Tauri stars, while the rest are objects with depleted or transition disks. Objects characterised as bursters show by far the highest variability. Dippers and objects whose variability is dominated by occultations from normal interstellar dust or dust with larger grains(or opaque material) have smaller amplitudes. We have established a hierarchical clustering algorithm based on the light-curve properties which allows the identification of the YSOs with the most unusual behaviour, and to group sources with similar properties. We discuss in detail the light-curves of the unusual objects V2492 Cyg, V350 Cep and2MASS J21383981+5708470.
Froebrich , D , Campbell-White , J , Scholz , A , Eislöffel , J , Zegmott , T , Billington , S J , Donohoe , J , Makin , S V , Hibbert , R , Newport , R J , Pickard , R , Quinn , N , Rodda , T , Piehler , G , Shelley , M , Parkinson , S , Wiersema , K & Walton , I 2018 , ' A survey for variable young stars with small telescopes : first results from HOYS-CAPS ' Monthly Notices of the Royal Astronomical Society , vol. 478 , no. 4 , pp. 5091-5103 . https://doi.org/10.1093/mnras/sty1350
Monthly Notices of the Royal Astronomical Society
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty1350
DescriptionJ. Campbell-White acknowledges the studentship provided by the University of Kent. S.V.Makin acknowledges an SFTC scholarship (1482158).KWacknowledges funding by STFC. K.Wiersema thanks Ray Mc Erlean and Dipali Thanki for technical support of the UL50 operations. This research made use of Montage. It is funded by the National Science Foundation under Grant Number ACI-1440620, and was previously funded by the National Aeronautics and Space Administration’s Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology.
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