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

Froebrich, Dirk, Scholz, Aleks, Campbell-White, Justyn, Vanaverbeke, Siegfried, Herbert, Carys, Eislöffel, Jochen, Urtly, Thomas, Long, Timothy P, Walton, Ivan L, Wiersema, Klaas, and others. (2024) A survey for variable young stars with small telescopes – VIII. Properties of 1687 Gaia selected members in 21 nearby clusters. Monthly Notices of the Royal Astronomical Society, 529 (2). pp. 1283-1298. ISSN 0035-8711. E-ISSN 1365-2966. (doi:10.1093/mnras/stae311) (KAR id:104881)

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Official URL:
https://doi.org/10.1093/mnras%2Fstae311
Related resource
Resource title: A survey for variable young stars with small telescopes: VIII — Properties of 1687 Gaia selected members in 21 nearby clusters
Resource type: Pre-print
DOI: 10.48550/arXiv.2401.16883
KDR/KAR URL: https://kar.kent.ac.uk/104820/
External URL: https://doi.org/10.48550/arXiv.2401.16883

Abstract

The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multi-filter, high cadence monitoring of 25 nearby young clusters and star forming regions. Utilising Gaia DR3 data we have identified about 17000 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 one kiloparsec 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 to almost 100 percent, and correlates positively with the fraction of stars with detectable inner disks, indicating that a lot of variability is driven by the disk. About one in six variables shows detectable periodicity, mostly caused by magnetic spots. Two thirds of the periodic variables with disk excess emission are slow rotators, and amongst the stars without disk excess two thirds are fast rotators – in agreement with rotation being slowed down by the presence of a disk.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stae311
Uncontrolled keywords: stars: formation, pre-main sequence, stars: variables: T Tauri, Herbig Ae/Be, stars: rotation
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Funders: University of Kent (https://ror.org/00xkeyj56)
Science and Technology Facilities Council (https://ror.org/057g20z61)
European Research Council (https://ror.org/0472cxd90)
European Space Agency (https://ror.org/03wd9za21)
Depositing User: Dirk Froebrich
Date Deposited: 06 Feb 2024 09:05 UTC
Last Modified: 05 Nov 2024 13:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/104881 (The current URI for this page, for reference purposes)

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