A survey for variable young stars with small telescopes – VIII. Properties of 1687 Gaia selected members in 21 nearby clusters

Dirk Froebrich, Aleks Scholz, Justyn Campbell-White, Siegfried Vanaverbeke, Carys Herbert, Jochen Eislöffel, Thomas Urtly, Timothy P Long, Ivan L Walton, Klaas Wiersema, Nick J Quinn, Tony Rodda, Juan-Luis González-Carballo, Mario Morales Aimar, Rafael Castillo García, Francisco C Soldán Alfaro, Faustino García de la Cuesta, Domenico Licchelli, Alex Escartin Perez, José Luis Salto GonzálezMarc Deldem, Stephen R L Futcher, Tim Nelson, Shawn Dvorak, Dawid Moździerski, Krzysztof Kotysz, Przemysław Mikołajczyk, George Fleming, Mark Phillips, Tony Vale, Yenal Öğmen, Franky Dubois, Samantha M Rolfe, David A Campbell, Heinz-Bernd Eggenstein, Franz-Josef Hambsch, Michael A Heald, Pablo Lewin, Adam C Rose, Geoffrey Stone, Martin Valentine Crow, Simon Francis Dawes, Derek OKeeffe, Adam Popowicz, Krzysztof Bernacki, Andrzej Malcher, Slawomir Lasota, Jerzy Fiolka, Adam Dustor, Amritanshu Vajpayee, Pat Devine, Matthias Kolb, Jean-Baptiste Marquette, Gregg L Ruppel, Dan R Crowson, Cledison Marcos da Silva, Michel Michaud, Aashini L Patel, Matthew D Dickers, Lord Dover, Ivana I Grozdanova, James S Urquhart, Chris J R Lynch

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The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multifilter, high cadence monitoring of 25 nearby young clusters and star-forming regions. Utilizing Gaia DR3 data, we have identified about 17 000 potential young stellar members in 45 coherent astrometric groups in these fields. Twenty one of them are clear young groups or clusters of stars within 1 kpc and they contain 9143 Gaia selected potential members. The cluster distances, proper motions, and membership numbers are determined. We analyse long-term (≈ 7 yr) V-, R-, and I-band light curves from HOYS for 1687 of the potential cluster members. One quarter of the stars are variable in all three optical filters, and two-thirds of these have light curves that are symmetric around the mean. Light curves affected by obscuration from circumstellar materials are more common than those affected by accretion bursts, by a factor of 2–4. The variability fraction in the clusters ranges from 10 per cent to almost 100 per cent, and correlates positively with the fraction of stars with detectable inner discs, indicating that a lot of variability is driven by the disc. About one in six variables shows detectable periodicity, mostly caused by magnetic spots. Two-thirds of the periodic variables with disc excess emission are slow rotators, and amongst the stars without disc excess two-thirds are fast rotators – in agreement with rotation being slowed down by the presence of a disc.
Original languageEnglish
Pages (from-to)1283-1298
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 1 Feb 2024


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