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Dainis Dravins. Profile photo.

Dainis Dravins

Professor emeritus

Dainis Dravins. Profile photo.

Absolute wavelength shifts - A new diagnostic for rapidly rotating stars

Author

  • Dainis Dravins

Editor

  • A. Maeder
  • P. Eenens

Summary, in English

Accuracies reached in space astrometry now permit. the accurate determination of astrometric radial velocities. without any use of spectroscopy. Knowing this true stellar motion, spectral shifts; intrinsic to stellar atmospheres can be identified, for instance gravitational redshifts and those caused by, velocity fields on stellar surfaces. The astrometric accuracy is independent. of any spectral complexity, such as the smeared-out line profiles of rapidly rotating stars. Besides a better determination of stellar velocities, this permits more precise studies of atmospheric dynamics, such as possible modifications of stellar surface convection (granulation) by rotation-induced forces, as well as a potential for observing meridional flows across stellar surfaces.

Department/s

  • Lund Observatory

Publishing year

2004

Language

English

Pages

27-32

Publication/Series

Stellar Rotation; IAU Symposium

Issue

215

Document type

Conference paper

Publisher

Astronomical Society of the Pacific (ASP)

Topic

  • Astronomy, Astrophysics and Cosmology

Conference name

Stellar rotation

Conference date

2002-11-11 - 2002-11-15

Conference place

Cancun, Mexico

Status

Published

ISBN/ISSN/Other

  • ISSN: 0074-1809