A survey for variable young stars with small telescopes – IV. Rotation periods of YSOs in IC 5070
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Studying rotational variability of young stars is enabling us to investigate a multitude of properties of young star-disc systems. We utilize high cadence, multiwavelength optical time series data from the Hunting Outbursting Young Stars citizen science project to identify periodic variables in the Pelican Nebula (IC 5070). A double blind study using nine different period-finding algorithms was conducted and a sample of 59 periodic variables was identified. We find that a combination of four period finding algorithms can achieve a completeness of 85 per cent and a contamination of 30 per cent in identifying periods in inhomogeneous data sets. The best performing methods are periodograms that rely on fitting a sine curve. Utilizing Gaia EDR3 data, we have identified an unbiased sample of 40 periodic young stellar objects (YSOs), without using any colour or magnitude selections. With a 98.9 per cent probability, we can exclude a homogeneous YSO period distribution. Instead, we find a bi-modal distribution with peaks at 3 and 8 d. The sample has a disc fraction of 50 per cent, and its statistical properties are in agreement with other similarly aged YSOs populations. In particular, we confirm that the presence of the disc is linked to predominantly slow rotation and find a probability of 4.8 × 10−3 that the observed relation between period and presence of a disc has occurred by chance. In our sample of periodic variables, we also find pulsating giants, an eclipsing binary, and potential YSOs in the foreground of IC 5070.
Froebrich , D , Derezea , E , Scholz , A , Eislöffel , J , Vanaverbeke , S , Kume , A , Herbert , C , Campbell-White , J , Miller , N , Stecklum , B , Makin , S V , Urtly , T , Soldán Alfaro , F C , Schwendeman , E , Stone , G , Phillips , M , Fleming , G , Gonzalez Farfán , R , Vanmunster , T , Heald , M A , Fernández Mañanes , E , Nelson , T , Eggenstein , H-B , Dubois , F , Logie , L , Rau , S , Wiersema , K , Quinn , N , Rodriguez , D , Castillo García , R , Killestein , T , Vale , T , Licchelli , D , Deldem , M , Piehler , G , Moździerski , D , Kotysz , K , Kowalska , K , Mikołajczyk , P , Futcher , S R L , Long , T P , Morales Aimar , M , Merrikin , B , Johnstone , S , Dubovský , P A , Kudzej , I , Pickard , R , Billington , S J , Dover , L , Zegmott , T , Evitts , J J , Traspas Munia , A & Price , M C 2021 , ' A survey for variable young stars with small telescopes – IV. Rotation periods of YSOs in IC 5070 ' , Monthly Notices of the Royal Astronomical Society , vol. 506 , no. 4 , pp. 5989-6000 . https://doi.org/10.1093/mnras/stab2082
Monthly Notices of the Royal Astronomical Society
Copyright 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stab2082.
DescriptionFunding: AS acknowledges support through STFC grant ST/R000824/1. JCW acknowledges support through STFC grant ST/S000399/1. This research was partially supported by the supercomputing infrastructure of the National Laboratory for High Performance Computing (NLHPC) (ECM-02).
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