Line profile variations in γ Equ: A puzzle

Details Line profile variations in γ Equ: A puzzle Line profile variations in γ Equ: A puzzle

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..310..287s&link_type=abstract

Variable Stars in the Local Group, IAU Colloquium 193, Proceedings of the conference held 6-11 July, 2003 at Christchurch, New Z

Astronomy and Astrophysics

Astronomy

5

Scientific paper

Line profile variations in γ Equ show the classic blue-to-red traveling bumps of m-modes resolved by rotation, and they have been identified as l= 2 or 3, m = -l or -ll+1 by characterising the line shapes using the moment method. The mode identifications cannot be correct, however, since γ Equ is an extremely slowly rotating star (Prot > 70 yr). We propose an alternative interpretation, according to which the observed line profile variations are a manifestation of a shock wave in the high atmosphere near the magnetic polar regions; the oscillation mode is then still consistent with the photometric observations.

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