224 citations · 804 across the 61 of their papers we have counts for
16 papers · 1 filter
Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event
V. V. Grechnev, A. M. Uralov, V. A. Slemzin +3
We present a case study of the 13 July 2004 solar event, in which disturbances caused by eruption of a filament from an active region embraced a quarter of the visible solar surfac…
Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
We present a homogeneous photometric and spectroscopic analysis of 18 stars along the evolutionary sequence of the metal-poor globular cluster NGC 6397 ([Fe/H] = -2), from the main…
The use of the Cherenkov radiation and the fluorescence light to calibrate the energy of giant air showers
L. G. Dedenko, D. A. Podgrudkov, T. M. Roganova +3
In terms of the quark-gluon string model the analysis of the classic procedure to estimate the energy of giant air showers with help of the parameter s(600) (a density of energy de…
On the contribution of point sources to the Galactic ridge X-ray emission
M. Revnivtsev, S. Sazonov
We analyzed deep Chandra observations of the Galactic plane region centered at l=28.55, b=-0.03 with the aim to obtain the best possible constraints on the contribution of weak poi…
X-ray emission from the stellar population in M32
M. Revnivtsev, E. Churazov, S. Sazonov +2
Using Chandra observations, we study the X-ray emission of the stellar population in the compact dwarf elliptical galaxy M32. The proximity of M32 allows one to resolve all bright…
Resolving the Galactic X-ray background
M. Revnivtsev, A. Vikhlinin, S. Sazonov
We use Chandra deep observations of the Galactic Center (GC) region to improve the constraints on the unresolved fraction of the Galactic X-ray background (also known as the Galact…
Superhumps in Binary Systems and Their Connection to Precessional Spiral Density Waves
P. V. Kaygorodov, D. V. Bisikalo, O. A. Kuznetsov +1
We consider a mechanism for the formation of superhumps in the TV Col system, based on the possible existence of a precessional spiral wave in the accretion disk of the system. Thi…
Nature of nuclear rings in unbarred galaxies: NGC 7742 and NGC 7217
O. K. Sil'chenko, A. V. Moiseev
We have studied the unbarred Sb galaxy with a nuclear star-forming ring, NGC 7742, by means of 2D spectroscopy, long-slit spectroscopy, and imaging, and have compared the results w…
Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4
S. S. Tsygankov, A. A. Lutovinov
We analyze the observations of the X-ray pulsar LMC X-4 performed by the INTEGRAL observatory and the All-Sky Monitor (ASM) of the RXTE observatory over a wide energy range. The ob…
The Leo I Cloud: Secular nuclear evolution of NGC 3379, NGC 3384, and NGC 3368?
O. K. Sil'chenko, A. V. Moiseev, V. L. Afanasiev +2
The central regions of the three brightest members of the Leo I galaxy group -- NGC 3368, NGC 3379, and NGC 3384 -- are investigated by means of 2D spectroscopy. In all three galax…
IGR J16318-4848: an X-ray source in a dense envelope?
M. Revnivtsev, S. Sazonov, M. Gilfanov +1
The hard X-ray source IGR J16318-4848 was recently discovered by the INTEGRAL observatory (Courvoisier et al.) and subsequently uncovered in archival data of ASCA observations in 1…
Polarization of cosmic microwave background scattered by moving flat protoobjects
N. N. Shakhvorostova, S. I. Grachev, V. K. Dubrovich
The work is devoted to the investigations of possible observational manifestations of protoobjects related to "dark ages" epoch (10 < z < 1000), before formation of self-luminous g…
Lx-SFR relation in star forming galaxies
M. Gilfanov, H. -J. Grimm, R. Sunyaev
We compare the results of Grimm et al. (2003) and Ranalli et al. (2003) on the Lx-SFR relation in normal galaxies. Based on the Lx-stellar mass dependence for LMXBs, we show, that…
Energy exchange inside SN ejecta and light curves of SNe Ia
E. I. Sorokina, S. I. Blinnikov
A treatment of line opacity in expanding medium is most crucial for the light curve (LC) modeling of Type Ia supernovae (SNe Ia). Spectral lines are the main source of opacity insi…
Reflection and noise in Cygnus X-1
M. Gilfanov, E. Churazov, M. Revnivtsev
We analyzed RXTE/PCA observations of Cyg X-1 from 1996-1998. We found a tight correlation between the characteristic noise frequencies (e.g. the break frequency nu_br) and the spec…
Discovery of the secondary star of the HgMn binary kappa Cancri
T. Ryabchikova, O. Kotchoukhov, G. Galazutdinov +2
A careful investigation of a CCD spectrum of the SB1 system kappa Cnc in the spectral region 3800 A - 8000 A resulted in the discovery of the lines of the secondary star. We then a…