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A survey for variable young stars with small telescopes : first results from HOYS-CAPS
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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, Klaas and Walton, I. (2018) A survey for variable young stars with small telescopes : first results from HOYS-CAPS. Monthly Notices of the Royal Astronomical Society, 478 (4). pp. 5091-5103. doi:10.1093/mnras/sty1350
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Official URL: http://dx.doi.org/10.1093/mnras/sty1350
Abstract
Variability in young stellar objects (YSOs) is one of their primary characteristics. Long-term, multifilter, 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 that 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 characterized 466 variable (413 confirmed young) stars in eight 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 yr, 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 discs. Objects characterized 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 that 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, and 2MASS J21383981+5708470.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||
| Divisions: | Faculty of Science > Physics | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | T Tauri stars, Early stars, Variable stars | ||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||
| ISSN: | 0035-8711 | ||||||||||||||||||
| Official Date: | August 2018 | ||||||||||||||||||
| Dates: |
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| Volume: | 478 | ||||||||||||||||||
| Number: | 4 | ||||||||||||||||||
| Page Range: | pp. 5091-5103 | ||||||||||||||||||
| DOI: | 10.1093/mnras/sty1350 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record D Froebrich, J Campbell-White, A Scholz, J Eislöffel, T Zegmott, S J Billington, J Donohoe, S V Makin, R Hibbert, R J Newport, R Pickard, N Quinn, T Rodda, G Piehler, M Shelley, S Parkinson, K Wiersema, I Walton; A survey for variable young stars with small telescopes: First results from HOYS-CAPS, Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 4, 21 August 2018, Pages 5091–5103, https://doi.org/10.1093/mnras/sty1350 is available online at: https://doi.org/10.1093/mnras/sty1350 | ||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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