Variable Hα Emission and Absorption in Helium-Peculiar Stars

Details Variable Hα Emission and Absorption in Helium-Peculiar Stars Variable Hα Emission and Absorption in Helium-Peculiar Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.4506b&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #45.06; Bulletin of the American Astronomical Society, Vol. 25, p.871

Astronomy and Astrophysics

Astrophysics

Scientific paper

We are carrying out a program of high signal-to-noise, high resolution Hα spectroscopy of a number of magnetic helium-strong and helium-weak stars with the Canada-France-Hawaii 3.6-m, Dominion Astrophysical Observatory 1.8-m, and David Dunlap Observatory 1.8-m telescopes. These observations have resulted in the discovery of several new spectrum variables, and include the first observations of variable Hα emission and absorption in a number of helium-weak stars. In all cases, the spectrum variations have periods identical to the stars' rotation periods as derived from photometric or polarimetric observations. As has been suggested for the prototypical helium-strong star sigma Ori E, the Hα variations apparently arise from the changing aspect of circumstellar material trapped in the magnetospheres of these peculiar stars.

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