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A survey for variable young stars with small telescopes - III. Warm spots on the active star V1598 Cyg
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dc.contributor.author | Froebrich, Dirk | |
dc.contributor.author | Scholz, Aleks | |
dc.contributor.author | Eislöffel, Jochen | |
dc.contributor.author | Stecklum, Bringfried | |
dc.date.accessioned | 2020-10-27T16:56:54Z | |
dc.date.available | 2020-10-27T16:56:54Z | |
dc.date.issued | 2020-10 | |
dc.identifier | 270885823 | |
dc.identifier | 302df21c-23b4-4cfc-b7c6-d4ca5ecdf9ef | |
dc.identifier | 85097411617 | |
dc.identifier | 000587739300047 | |
dc.identifier.citation | Froebrich , D , Scholz , A , Eislöffel , J & Stecklum , B 2020 , ' A survey for variable young stars with small telescopes - III. Warm spots on the active star V1598 Cyg ' , Monthly Notices of the Royal Astronomical Society , vol. 497 , no. 4 , pp. 4602-4613 . https://doi.org/10.1093/mnras/staa2275 | en |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | BibCode: 2020MNRAS.497.4602F | |
dc.identifier.uri | https://hdl.handle.net/10023/20832 | |
dc.description | Funding: AS acknowledges support through STFC grant ST/R000824/1. | en |
dc.description.abstract | Magnetic spots on low-mass stars can be traced and characterized using multiband photometric light curves. Here, we analyse an extensive dataset for one active star, V1598 Cyg, a known variable K dwarf which is either pre-main sequence and/or in a close binary system. Our light curve contains 2854 photometric data points, mostly in V, Rc,Ic, but also in U, B, and Hα, with a total baseline of about 4 yr, obtained with small telescopes as part of the HOYS project. We find that V1598 Cyg is a very fast rotator with a period of 0.8246 d and varying amplitudes in all filters, best explained as a signature of strong magnetic activity and spots. We fit the photometric amplitudes inV, Rc, Ic and use them to estimate spot properties, using a grid-based method that is also propagating uncertainties. We verify the method on a partial data set with high cadence and all five broad-band filters. The method yields spot temperatures and fractional spot coverage with typical uncertainties of100 K and 3-4 per cent, respectively. V1598 Cyg consistently exhibits spots that are a few hundred degrees warmer than the photosphere, most likely indicating that the light curve is dominated by chromospheric plage. The spot activity varies over our observing baseline, with a typical time-scale of 0.5-1 yr, which we interpret as the typical spot lifetime. Combining our light curve with archival data, we find a six year cycle in the average brightness, that is probably a sign of a magnetic activity cycle. | |
dc.format.extent | 3320358 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en |
dc.subject | Stars: formation | en |
dc.subject | Stars: individual: V 1598 Cyg | en |
dc.subject | Stars: variables: T Tauri | en |
dc.subject | Herbig Ae/Be | en |
dc.subject | Stars: pre-main-sequence | en |
dc.subject | QB Astronomy | en |
dc.subject | QC Physics | en |
dc.subject | 3rd-DAS | en |
dc.subject.lcc | QB | en |
dc.subject.lcc | QC | en |
dc.title | A survey for variable young stars with small telescopes - III. Warm spots on the active star V1598 Cyg | en |
dc.type | Journal article | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | 10.1093/mnras/staa2275 | |
dc.description.status | Peer reviewed | en |
dc.identifier.url | http://adsabs.harvard.edu/abs/2020MNRAS.497.4602F | en |
dc.identifier.grantnumber | ST/R00824/1 | en |
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