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Spectroscopy of the roAp star Alpha-Cir -- II. The bisector and equivalent-width of the H-alpha line | | I. K. Baldry
; M. Viskum
; T. R. Bedding
; H. Kjeldsen
; S. Frandsen
; | | Date: |
23 Sep 1998 | | Subject: | astro-ph | | Abstract: | We present bisector measurements of the H-alpha line of the rapidly oscillating Ap (roAp) star, Alpha-Cir, obtained from dual-site observations with medium-dispersion spectrographs. The velocity amplitude and phase of the principal pulsation mode vary significantly, depending on the height in the H-alpha line, including a phase reversal between the core and the wings of the line. This supports the theory, suggested in Paper I, of a radial pulsational node in the atmosphere of the star. Blending with metal lines partially affects the H-alpha bisector results but probably not enough to explain the phase reversal. We have also detected changes in the equivalent-width of the line during the pulsation, and measured the oscillatory signal as a function of wavelength across the H-alpha region. | | Source: | arXiv, astro-ph/9809281 | | Services: | Forum | Review | PDF | Favorites | |
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