Search Publications
Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
Gontcharov, G. A.
The Pulkovo Compilation of Radial Velocities (PCRV) has been made to study the stellar kinematics in the local spiral arm. The PCRV contains weighted mean absolute radial velocities for 35 495 Hipparcos stars of various spectral types and luminosity classes over the entire celestial sphere mainly within 500 pc of the Sun. The median accuracy of th…
Hard X-ray bursts detected by the IBIS telescope onboard the INTEGRAL observatory in 2003 2004
Sunyaev, R. A.; Grebenev, S. A.; Chelovekov, I. V.
All of the observations performed with the IBIS telescope onboard the INTEGRAL observatory during the first one and a half years of its in-orbit operation (from February 10, 2003, through July 2, 2004) have been analyzed to find X-ray bursts. The time history of the IBIS/ISGRI total count rate in the energy range 15-25 keV revealed 1077 bursts of …
New nearby active galactic nuclei among INTEGRAL and RXTE X-ray sources
Bikmaev, I. F.; Sunyaev, R. A.; Revnivtsev, M. G. +1 more
We present the first results of a campaign to optically identify X-ray sources discovered in the all-sky surveys of the RXTE and INTEGRAL observatories. Six newly discovered sources proved to be hitherto unknown nearby active galactic nuclei (z < 0.1). Spectrophotometric studies of these sources were performed with the Russian-Turkish 1.5-m tel…
Observational evidence for AGN fueling: I. The case of NGC 6104â€''Merging with a companion
Moiseev, A. V.; Afanasiev, V. L.; Smirnova, A. A.
We investigate in detail the kinematics and morphology of the Seyfert galaxy NGC 6104 in order to identify the mechanism of gas transportation to the active galactic nucleus (AGN). Our observational data were obtained at the 6-m Special Astrophysical Observatory telescope with the MPFS integral-field spectrograph and the SCORPIO universal device i…
Central regions of the early-type galaxies in the NGC 3169 group
Sil'chenko, O. K.; Afanasiev, V. L.
We have investigated the central regions of the galaxies in the NGC 3169/NGC 3166/NGC 3156 group with the multipupil fiber spectrograph of the 6-m telescope; the first (central) galaxy in the group is a spiral (Sa) one and the other two galaxies are lenticular ones. The group is known to have an extended HI cloud with a size of more than 100 kpc t…
Structure and kinematics of the interstellar medium in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456)
Moiseev, A. V.; Lozinskaya, T. A.; Egorov, O. V. +1 more
The structure and kinematics of ionized supershells in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456) are analyzed using observations with the SCORPIO focal reducer on the 6-m Special Astrophysical Observatory telescope in three modes: direct imaging (in the Hα, [O III], and [S II] lines), long-slit spectroscopy, and spectroscopy …
Multiple acceleration of protons on the Sun and their free propagation to the Earth on January 20, 2005
Struminsky, A. B.
We analyze the observations of solar protons with energies >80 MeV near the Earth and the January 20, 2005, solar flare in various ranges of the electromagnetic spectrum. Within approximately the first 30 min after their escape into interplanetary space, the solar protons with energies above 80 MeV propagated without scattering to the Earth and…
Stellar structure of the dwarf irregular galaxy DDO 216
Tikhonov, N. A.
Observations with the 6-mBTA telescope and archival Hubble Space Telescope data were used for the photometry of stars in the dwarf edge-on irregular galaxy DDO 216 (Peg DIG). We determined the change in the number density of stars of various ages along the major and minor axes of the galaxy. We found that the young stars of the galaxy concentrate …
On the interstellar extinction law toward young stars
Lamzin, S. A.
We have determined the atomic hydrogen column density N HI toward all of the young stars from the Taurus-Auriga-Perseus star-forming complex for which the corresponding spectra are available in the Hubble Space Telescope archive (nine stars) by analyzing the Lyα line profile. We show that the stars studied, except DR Tau, lie not far from the edge…
Astrometric study of the triple star ADS 9173
Kiyaeva, O. V.
An approximate orbit of the wide visual binary star ADS 9173 A(Bb) with a period of ∼6000 yr has been determined for the first time by the method of apparent motion parameters. The orbit was computed using a short (1982 2004) arc of photographic observations obtained with the 26-inch Pulkovo Observatory refractor and the Hipparcos parallax. Agreem…