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

DATA NETWORKING SUPPORT SERVICES OF PUSHCHINO RADIOASTRONOMY OBSERVATORY, ASTROSPACE CENTER OF LEBEDEV PHYSICAL INSTITUTE

Growth of local area network Observatory associated with employee needs to access network resources has led to an increase in the number of computing and network devices. Until recently, we tested performance of these sy...

2-field model of dark energy with canonical and non-canonical kinetic terms

For some parametrizations of the dark energy equation of state that varies in time there is transition from quintessence to phantom or vice versa at a certain redshift. Quintom – the 2-field model with 2 canonical kineti...

THE MEAN LIGHT CURVES OF THE MIRA-TYPE STARS IN THE H- AND K-BANDS

For nine Mira-type stars (o Cet, R Leo, S Car, U Her, X Oph, R Aql, RR Aql, S Ori, S Scl,) and one semi-regular star (L2 Pup), the mean light curves have been obtained. The initial values of the brightness (observations)...

RADIOACTIVE MOLECULES IN SN1987A REMNANT

The investigation of SN1987A remnant is complicated due to absence of the source of ionizing radiation, which should excite the remnant’s atoms and molecule. X-ray radiation from the shock wave front and, in...

RESONANCES IN ASTEROID SYSTEMS

Today the following types of resonances in the rotation of celestial bodies in the solar system are known, namely orbital, spin-orbit and spin-spin resonances. This paper presents our computations of these types of reson...

Download PDF file
  • EP ID EP604438
  • DOI -
  • Views 87
  • Downloads 0

How To Cite

Y. M. Maharramov, A. Sh. Baloglanov (2015). SPECTROSCOPIC VARIABILITY OF THE SUPERGIANTS HD21389 AND HD187982. Odessa Astronomical Publications, 28(1), 39-45. https://europub.co.uk./articles/-A-604438