Some peculiarities of the variability of the positional and photometric line parameters in the spectrum of HD 93521. Differential rotation of the star

Details Some peculiarities of the variability of the positional and photometric line parameters in the spectrum of HD 93521. Differential rotation of the star Some peculiarities of the variability of the positional and photometric line parameters in the spectrum of HD 93521. Differential rotation of the star

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astbu..63..264r&link_type=abstract

Astrophysical Bulletin, Volume 63, Issue 3, pp.264-271

Astronomy and Astrophysics

Astrophysics

2

97.10.Kc, 97.10.Sj, 97.10.Wn, 97.20.Ec, Stellar Rotation, Pulsations, Oscillations, And Stellar Seismology, Proper Motions And Radial Velocities, Space Motions, Main-Sequence: Early-Type Stars

Scientific paper

The variability of positional and photometric parameters of the lines in the spectrum of HD 93521 is analyzed using CCD spectra taken with the PFES echelle spectrograph of the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). To study the velocity field of the star’s atmosphere, the radial velocity variations are measured separately for the blue and red halves of the absorption profile at different levels of residual line intensity. The amplitude and phase of temporal variations of radial velocity differ for the two halves of the absorption profile. In case of strong HeI, H β, andH α lines the amplitude depends on intensity r. The time scales (P) of radial velocity variations and the mean halfwidths overline {FW H M} differ for different lines and correlate fairly well with their central depths. The increase of P and decrease of overline {FW H M} from weak to strong lines are due to the differential nature of the rotation of the star. Our analysis proofs that HD 93521 is a run-away star and this fact explains its location at a distance of about 2.0 kpc above the Galactic plane.

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