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Modelling UX Ori st...
Modelling UX Ori star eclipses based on spectral observations with the Nordic Optical Telescope - I. RR Tau
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- Grinin, V. P. (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, Russia
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- Tambovtseva, L. (author)
- Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia
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- Djupvik, A. A. (author)
- 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
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- Gahm, Gösta F., 1942- (author)
- Stockholms universitet,Institutionen för astronomi,Stockholm Observatory, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden
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- Grenman, Tiia (author)
- Luleå tekniska universitet,Materialvetenskap
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- Weber, H. (author)
- Luleå tekniska universitet,Materialvetenskap
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- Bengtsson, H. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- De Angelis, H. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- Duszanowicz, G. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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Heinonen, D. (author)
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- Holmberg, G. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- Karlsson, T. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- Larsson, M. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- Warell, J. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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- Wikander, T. (author)
- SAAF, Svensk AmatörAstronomisk Förening, Sweden
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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 Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoye Shosse 65, St. Petersburg 196140, Russia (creator_code:org_t)
- Oxford University Press, 2023
- 2023
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 524:3, s. 4047-4061
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- line
- formation - techniques
- spectroscopic - stars
- individual
- RR Tau - stars
- pre-main-sequence - stars
- winds
- outflows
- Applied Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Grinin, V. P.
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Tambovtseva, L.
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Djupvik, A. A.
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Gahm, Gösta F., ...
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Grenman, Tiia
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Weber, H.
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Bengtsson, H.
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De Angelis, H.
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Duszanowicz, G.
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Heinonen, D.
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Holmberg, G.
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Karlsson, T.
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Larsson, M.
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Warell, J.
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Wikander, T.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly notices ...
- By the university
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Stockholm University
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Luleå University of Technology