A survey for variable young stars with small telescopes

First results from HOYS-CAPS

D. Froebrich (Lead / Corresponding author), 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

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)5091-5103
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume478
Issue number4
Early online date23 May 2018
DOIs
Publication statusPublished - Aug 2018

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light curve
telescopes
stars
dust
T Tauri stars
occultation
Northern Hemisphere
night
filters
monitoring
young
filter

Keywords

  • stars: formation
  • pre-main-sequence
  • stars: variables: general
  • T-Tauri
  • Herbig Ae/Be

Cite this

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. / A survey for variable young stars with small telescopes : First results from HOYS-CAPS. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 478, No. 4. pp. 5091-5103.
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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.",
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author = "D. Froebrich and J. Campbell-White and A. Scholz and J. Eisl{\"o}ffel and T. Zegmott and Billington, {S. J.} and J. Donohoe and Makin, {S. V.} and R. Hibbert and Newport, {R. J.} and R. Pickard and N. Quinn and T. Rodda and G. Piehler and M. Shelley and S. Parkinson and K. Wiersema and I. Walton",
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Froebrich, D, Campbell-White, J, Scholz, A, Eislöffel, J, Zegmott, T, Billington, SJ, Donohoe, J, Makin, SV, Hibbert, R, Newport, RJ, 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

A survey for variable young stars with small telescopes : First results from HOYS-CAPS. / Froebrich, D. (Lead / Corresponding author); 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 478, No. 4, 08.2018, p. 5091-5103.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A survey for variable young stars with small telescopes

T2 - First results from HOYS-CAPS

AU - Froebrich, D.

AU - Campbell-White, J.

AU - Scholz, A.

AU - Eislöffel, J.

AU - Zegmott, T.

AU - Billington, S. J.

AU - Donohoe, J.

AU - Makin, S. V.

AU - Hibbert, R.

AU - Newport, R. J.

AU - Pickard, R.

AU - Quinn, N.

AU - Rodda, T.

AU - Piehler, G.

AU - Shelley, M.

AU - Parkinson, S.

AU - Wiersema, K.

AU - Walton, I.

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N2 - 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.

AB - 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.

KW - stars: formation

KW - pre-main-sequence

KW - stars: variables: general

KW - T-Tauri

KW - Herbig Ae/Be

U2 - 10.1093/mnras/sty1350

DO - 10.1093/mnras/sty1350

M3 - Article

VL - 478

SP - 5091

EP - 5103

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -