A search for rapid radial velocity variations in α Circini

Details A search for rapid radial velocity variations in α Circini A search for rapid radial velocity variations in α Circini

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..454h&link_type=abstract

Astronomy and Astrophysics 285, 454-458 (1994)

Astronomy and Astrophysics

Astrophysics

18

Stars: Chemically Peculiar Techniques, Radial Velocities, Stars: Oscillations, Stars: Individual: {Alpha} Cir

Scientific paper

We present rapid radial velocity measurements (σ~55 m/s) for the roAp star α Cir made using a molecular iodine gas absorption cell. A period analysis places an upper limit of 60 m/s for the peak-to-peak amplitude of any radial velocity variations in the frequency range 20 to 375 days^-1^. Phasing the measurements to the known photometric period of 6.83 minutes results in an upper limit of 36 m/s (peak-to-peak) for the radial velocity amplitude of the pulsations. This yields an upper limit to the ratio of radial velocity amplitude to photometric amplitude (2K/{DELTA}m_B_) of about 10 km/s/mag, substantially less than was found for two other roAp stars by other investigators.

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