Spectrophotometry of a Galaxy with UV-excess

We present the results of a spectral study of Galaxy No. 47 of the list [1]. We determine the equivalent widths of the lines for the compact part of the galaxy and the relative intensities for both the compact part and the halo. We estimate the mass of the galaxy from the inclination of the H line. We obtain the electron density and the mass of the gas component of the compact part of the galaxy.Translated fromAstrofizika, Vol. 38, No. 2, 1995.     

A study of some stars with circumstellar dust envelopes. I

We present the results of a study of circumstellar dust envelopes of 36 stars of early(O-B-A) types in the directions of the associations Cas OB1, Cas OB2, Per OB1, and Ori OB1. We determine the absorption at 1640 Å, the linear radius of the dust envelopes, the mean value of the coefficient k, and the masses of the envelopes. They differ significantly from one another.Translated fromAstrofizika, Vol. 38, No. 3, 1995.     

Spectral observations of galaxies with UV excess

Spectral observations of 19 galaxies with UV-excesses from Kazarian’s list are reported. The spectra were obtained with the 2.6-m telescope at the Byurakan Observatory using the SCORPIO spectral camera. A grism was used to obtain spectra in the wavelength interval λλ7420-3920 Å. 43 spectra in which emission lines are mainly observed were obtained from the 19 galaxies, except for the spectra of Kaz 21, Kaz 178, Kaz 183, and Kaz 184. The spectra of Kaz 17, Kaz 151, Kaz 153, and Kaz 357 have type Sy2 galactic features. In the spectra of the galaxies Kaz 17, Kaz 151, and Kaz 153, absorption lines are observed along with high excitation emission lines such as HeI λ5876 Å and HeII λ4686 Å. No lines were observed within the interval λλ7420-3920 Å in the spectra of the galaxies Kaz 183 and Kaz 184. __________ Translated from Astrofizika, Vol. 49, No. 3, pp. 351–358 (August 2006).     

Oxygen-Rich Cool Stars in the Cepheus Region. New Spectroscopic Observations of Selected Objects from the KP2001 Catalog

Astrophysics - Spectra taken with the 2.6-m telescope at the Byurakan Astrophysical Observatory (BAO) in the λλ4000-7250Å range for eight M giants from the KP2001 catalog confirm...     

Comparative analysis of dynamic coefficient β(T, n) curves obtained by different methods

The problem of curve construction for dynamic coefficient β(T, n) based on the integral parameter of ground motion (cumulative absolute velocity (CAV)) is described. Comparative analysis of the curves β(T, n), obtained by maximum values of ground motion acceleration and via cumulative absolute velocity application, is carried out. The characteristic properties of changes in the considered dynamic coefficient curves are revealed and investigated.     

Spectral observation of the galaxy Kaz 17

The results of a spectral study of the galaxy Kaz 17 are presented. 150 lines are identified in its spectrum, of which 21 are in emission while the rest are absorption lines. These lines belong to the following elements and ions:..... and FeI. Roughly 56% of the absorption lines belong to FeI. Of the absorption lines, 10 belonging to TiI and FeI are isolated. Because of the closeness of their wavelengths, the rest merge and form separate absorption bands. 10 lines, including 8 emission lines, are unidentified in the spectrum of Kaz 17. In all, 160 lines were observed in the spectrum of Kaz 17. In terms of the structure of the emission lines, Kaz 17 can be assigned to type Sy1, and in terms of the absorption lines, it more closely resembles a normal galaxy. __________ Translated from Astrofizika, Vol. 49, No. 4, pp. 541–551 (November 2006).     

Techniques for characterizing weak transients in cosmic ray records,as measured by neutron monitor networks

The analysis of weak variations in the energetic particle flux, as detected by neutron or muon monitors, can often be considerably improved by analysing data from monitor networks and thereby exploiting the spatial coherence of the flux. We present a statistical framework for carrying out such an analysis and discuss its physical interpretation. Two other applications are also presented: filling data gaps and removing trends. This study focuses on the method and its various uses.     

Site survey and assessment for the planned seismogeodynamic monitoring network in the Republic of Armenia

We present results of a detailed analysis of data obtained from seismic geodynamic field studies conducted at proposed sites for the development of advanced seismic monitoring stations in the Republic of Armenia. These studies aim to determine the background seismic and geodynamic noise level around such sites. Finally, based on the received data and international standards, nine survey points were classified into respective classes according to their noise level. We also calculated minimum significant earthquake magnitude detectable by the proposed seismic network in different regions of Armenia and mapped it based on recorded regional earthquakes. The resulting map indicates that the proposed seismic monitoring network will provide homogenous initial data for the various seismically active regions of the territory of the Republic of Armenia.