Multifilter observations of the complex periodic variations in eight pre-main sequence stars

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dc.contributor.authorKoen, Chris
dc.date.accessioned2023-03-03T09:21:08Z
dc.date.available2023-03-03T09:21:08Z
dc.date.issued2023
dc.description.abstractFollow up time series photometry through various combinations of the BVRCIC filter set is presented for eight young stars. The complex periodic variability of seven of the stars was first discovered in TESS photometry, while one star was first observed by K2. The periods of the stars are short – 0.2–0.4 d. Reddening, effective temperatures, and bolometric magnitudes are estimated by fitting spectral energy distributions. The new photometry typically covers several cycles of variability. In some cases, photometry was obtained in more than one observing season. All new light curves differ from those obtained from satellite missions, in some cases substantially so. Amplitudes are almost always larger, the shorter the effective wavelength of the filter, but the relationship can be weak or non-monotonic. Given that all but one of the stars are in associations older than 10 Myr, it seems unlikely that protoplanetary discs play an important role in the complex variability patterns. Modelling of the wavelength dependence of amplitudes in terms of dust absorption in debris discs is explored. The conclusion is that excesses of small grains as compared with the average Galactic composition would be required.en_US
dc.identifier.citationKoen, C., 2023. Multifilter observations of the complex periodic variations in eight pre-main sequence stars. Monthly Notices of the Royal Astronomical Society, 518(2), pp.2921-2937.en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://dx.doi.org/10.1093/mnras/stac3276
dc.identifier.urihttp://hdl.handle.net/10566/8524
dc.publisherRoyal Astronomical Societyen_US
dc.subjectComplex periodic variationen_US
dc.subjectPhotometryen_US
dc.subjectMultifilter observationen_US
dc.subjectVariabilityen_US
dc.subjectStarsen_US
dc.titleMultifilter observations of the complex periodic variations in eight pre-main sequence starsen_US
dc.typeArticleen_US

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