Spectroscopy of the roAp star Alpha Cir. I - Velocities of H-alpha and metal lines

Details Spectroscopy of the roAp star Alpha Cir. I - Velocities of H-alpha and metal lines Spectroscopy of the roAp star Alpha Cir. I - Velocities of H-alpha and metal lines

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295...33b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 295, p. 33

Other

38

A Stars, Stellar Spectra, H Alpha Line, Metallicity, Radial Velocity, Stellar Oscillations, Velocity Measurement, Spectrographs, Stellar Atmospheres

Scientific paper

We present radial velocity measurements of the rapidly oscillating Ap (roAp) star Alpha Cir, obtained from dual-site observations with medium-dispersion spectrographs. The amplitude and phase of the principal pulsation mode vary significantly, depending on which line is being measured. The amplitude is observed to be as high as 1000 m/s in some wavelength bands, despite a previous upper limit of 36 m/s. Furthermore, some lines are apparently pulsating in antiphase with others. We suggest this indicates a high-overtone standing wave with a velocity node in the atmosphere of the star.

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