The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Default user image.

Magnus Larsson

Senior lecturer

Default user image.

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

Author

  • V.P. Grinin
  • L. V. Tambotseva
  • A. A. Djupvik
  • Gösta Gahm
  • T. Grenman
  • H. Weber
  • H. Bengtsson
  • H. De Angelis
  • G. Duszanowicz
  • D. Heinonen
  • G. Holmberg
  • T. Karlsson
  • Magnus Larsson
  • J. Warell
  • T. Wikander
Show all

Summary, in English

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 α 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 α 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.

Publishing year

2023-07-26

Language

English

Pages

4047-4061

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

524

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • line: formation
  • techniques: spectroscopic
  • stars: individual
  • RR Tau
  • stars: pre-main-sequence
  • stars: winds
  • outflows

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966