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  • Grinin, V. P.Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia; St. Petersburg State University, Universitetsky pr. 28, St. Petersburg 198504, Russia (author)

Modelling UX Ori star eclipses based on spectral observations with the Nordic Optical Telescope - I. RR Tau

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • Oxford University Press,2023
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-221378
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-221378URI
  • https://doi.org/10.1093/mnras/stad2108DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-101223URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Validerad;2023;Nivå 2;2023-09-06 (hanlid);Funder: Ministry of Science and Higher Education of the Russian Federation (075-15-2020-780) (N13.1902.21.0039)
  • Based on observations obtained with the Nordic Optical Telescope (NOT) we investigate the spectral variability of the Herbig Ae star RR Tau. This star belongs to the UX Ori family, characterized by very deep fadings caused by the screening of the star with opaque fragments (clouds) of the protoplanetary discs. At the moments of such minima one observes strong spectral variability due to the fact that the dust cloud occults, for an observer, not only the star but also a part of the region where the emission spectrum originates. We calculated a series of obscuration models to interpret the observed variability of the H a line parameters. We consider two main obscuration scenarios: (1) the dust screen rises vertically above the circumstellar disc, and (2) the screen intersects the line-of-sight moving azimuthally with the disc. In both cases, the model of the emission region consists of a compact magnetosphere and a magnetocentrifugal disc wind. Comparison with observations shows that the first scenario explains well the variability of the radiation flux, the equivalent width, as well as the asymmetry of the H a line during eclipses, while the second scenario explains them only partly. This permits us to suggest that in the case of RR Tau, the main causes of the eclipses are either a structured disc wind, or the charged dust lifted along the field lines of the poloidal component of the magnetic field of the circumstellar disc.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Tambovtseva, L.Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia (author)
  • Djupvik, A. A.Nordic Optical Telescope, Rambla José Ana Fernández Pérez 7, E-38711 Breña Baja, Spain; Department of Physics and Astronomy, Aarhus University, Munkegade 120, DK-8000 Aarhus C, Denmark (author)
  • Gahm, Gösta F.,1942-Stockholms universitet,Institutionen för astronomi,Stockholm Observatory, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden(Swepub:su)gahm (author)
  • Grenman, TiiaLuleå tekniska universitet,Materialvetenskap(Swepub:ltu)tigr (author)
  • Weber, H.Luleå tekniska universitet,Materialvetenskap(Swepub:ltu)weber (author)
  • Bengtsson, H.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • De Angelis, H.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Duszanowicz, G.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Heinonen, D. (author)
  • Holmberg, G.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Karlsson, T.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Larsson, M.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Warell, J.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Wikander, T.SAAF, Svensk AmatörAstronomisk Förening, Sweden (author)
  • Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia; St. Petersburg State University, Universitetsky pr. 28, St. Petersburg 198504, RussiaPulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press524:3, s. 4047-40610035-87111365-2966

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