SPECTROSCOPIC VARIABILITY OF THE SUPERGIANTS HD21389 AND HD187982
Journal Title: Odessa Astronomical Publications - Year 2015, Vol 28, Issue 1
Abstract
It has been revealed that absorption in the line of Hα has complex structure in the spectrum of the star HD21389 depending on the activity phase of the atmosphere. The profile of the line has inverse P Cyg type in the active phase of the star atmosphere. The emission components in the red and violet wing of the profile form and disappear. All the measured parameters of the Hα and Hβ lines change. It is supposed that such variations may be due to non-stationary and strong flow substance in the atmosphere of these stars. Appearance and disappearance of asymmetry in the profile of NaID doublet and formation of the Hα line type inverse P Cyg occurs synchronously in an active phase of the atmosphere of HD 21389. We assume that these changes are formed under the influence of the general mechanism which might be responsible for the observed variation is the growth of the envelope of the star with a following ejection of matter. Our researches showed that the values of radial velocity of the FeII lines change with time. However, we found no correlation of these changes with the period of 7.7 days found by earlier authors.
Authors and Affiliations
Y. M. Maharramov, A. Sh. Baloglanov
Keywords
Related Articles
- EP ID EP604438
- DOI -
- Views 71
- Downloads 0
BALDONE SCHMIDT (LATVIA) TELESCOPE ASTROPHOTOS ARCHIVE
From 1967 to 2005, many astrophotos have been taken with the Baldone Schmidt telescope (80cmx120cmx240cm). These photos have being archived in theInstituteofAstronomyof theUniversityofLatvia(IAU code 069, longitude 24.40...
The study of galactic beat cepheids with application of its results to those in the Magellanic Clouds
A thorough study of the correlation between P1=P0 ratio, fundamental period, and chemical composition (abundances of metals that compose Z) was conducted to investigate the significance of the iron-peak elements on the r...
DISTRIBUTION OF CARBON STARS IN THE GALAXY
A search for new faint carbon (C) stars in the Polar region δ > 55o has been accomplished by obtaining objective prism spectra in the near infrared 550 -- 900 nm on images of CCD camera of Baldone Schmidt telescope of As...
Superspace approach to the quantization of charged black holes with allowance for the cosmological constant
In the present paper, we study the geometry of a mini-superspace and its relation to the corresponding space-time geometry of a spherically symmetric configuration of electromagnetic and gravitational fields, taking into a...
THE PECULIARITIES IN O-TYPE GALAXY CLUSTERS
We present the results of analysis of 2D distribution of galaxies in galaxy cluster fields. The Catalogue of Galaxy Clusters and Groups PF (Panko & Flin) was used as input observational data set. We selected open rich PF...