1. A survey for variable young stars with small telescopes – IV. Rotation periods of YSOs in IC 5070
- Author
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Alejandra Traspas Munia, Igor Kudzej, Geoffrey Stone, Mark C. Price, P. Mikołajczyk, S. J. Billington, Barry Merrikin, Alfred Kume, Carys Herbert, Mario Morales Aimar, Esteban Fernández Mañanes, Steve Rau, Timothy P. Long, Tarik Zegmott, Franky Dubois, Bringfried Stecklum, Tim Nelson, Tonny Vanmunster, George Fleming, Efthymia Derezea, Nick Quinn, Rafael Gonzalez Farfán, Krzysztof Kotysz, Klaas Wiersema, Rafael Castillo García, Francisco C. Soldán Alfaro, Georg Piehler, Domenico Licchelli, Mark M. Phillips, Jochen Eislöffel, Jack J. Evitts, T. Killestein, Heinz-Bernd Eggenstein, Michael A. Heald, Diego Rodríguez, Pavol A. Dubovský, Thomas Urtly, Marc Deldem, Erik Schwendeman, D. Moździerski, Aleks Scholz, Katarzyna Kowalska, Siegfried Vanaverbeke, J. Campbell-White, Niall Miller, Ludwig Logie, Dirk Froebrich, S. V. Makin, Roger D. Pickard, Lord Dover, Stephen R. L. Futcher, Tony Vale, Stephen Johnstone, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. St Andrews Centre for Exoplanet Science
- Subjects
FOS: Physical sciences ,Rotation ,01 natural sciences ,0103 physical sciences ,QB Astronomy ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,formation [Stars] ,QC ,QB ,Physics ,pre-main-sequence [Stars] ,MCC ,010308 nuclear & particles physics ,Herbig Ae/Be ,Astronomy ,Astronomy and Astrophysics ,3rd-DAS ,Supercomputer ,Astrophysics - Astrophysics of Galaxies ,rotation [Stars] ,Stars ,Variable (computer science) ,QC Physics ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,variables: T Tauri [Stars] ,National laboratory - Abstract
Studying rotational variability of young stars is enabling us to investigate a multitude of properties of young star-disk systems. We utilise high cadence, multi-wavelength optical time series data from the Hunting Outbursting Young Stars citizen science project to identify periodic variables in the Pelican Nebula (IC5070). 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% and a contamination of 30% in identifying periods in inhomogeneous data sets. The best performing methods are periodograms that rely on fitting a sine curve. Utilising GaiaEDR3 data, we have identified an unbiased sample of 40 periodic YSOs, without using any colour or magnitude selections. With a 98.9% probability we can exclude a homogeneous YSO period distribution. Instead we find a bi-modal distribution with peaks at three and eight days. The sample has a disk fraction of 50%, and its statistical properties are in agreement with other similarly aged YSOs populations. In particular, we confirm that the presence of the disk is linked to predominantly slow rotation and find a probability of 4.8$\times$10$^{-3}$ that the observed relation between period and presence of a disk 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 IC5070., Comment: 25 pages, 14 figures, 5 tables, accepted for publication in MNRAS
- Published
- 2021