Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007smma.conf..198r&link_type=abstract
Spectroscopic methods in modern astrophysics. Proceedings of the conference held 13-15 September 2006, Moscow, Russia. Eds. L. M
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present results of analysis of pulsation motion and stratification of radial velocity in HD 93521 atmosphere. Time-radial-velocity variations were studied separately for blue and red halves of absorption profile and at different levels of residual intensity r of lines. The amplitude and phase (and period) of time-radial-velocity variations differ for these two halves of the absorption profile for same values r as well as for different r values. Amplitude dependence upon r is observed for strong lines HeI, Hβ, and Hα. The dependence differs for blue and red halves of absorption profiles and gives the information about kinematics of rising and falling layers of an atmosphere. Variability and stratification of radial velocity for these two layers differ. Revealing and study of such variations allows us to study the nature of stellar-wind variability in the region of wind formation. Variation of emission components of Hα line and absorption components of resonant lines of UV range are due to non-radial pulsations. The increase of the period of a radial velocity and decrease FWHM from weak to strong lines are due to differential rotation of the star layers. The rotation speed of layers, where HeI λ 7065, 4471 A, Hβ and Hα lines are formed, are accordingly 1.3, 1.8, 2.3 and 2.7 times less than ones where weak HeI λ 5015 and 4922 A lines are formed.
No associations
LandOfFree
Effective method for spectroscopic studying of pulsations motions in the atmospheres of stars I. HD 93521 O9.5 V - differential rotation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effective method for spectroscopic studying of pulsations motions in the atmospheres of stars I. HD 93521 O9.5 V - differential rotation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effective method for spectroscopic studying of pulsations motions in the atmospheres of stars I. HD 93521 O9.5 V - differential rotation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1878845