Search Publications
The X-ray Evolution of the Symbiotic Star V407 Cyg during its 2010 Outburst
Nelson, T.; Mukai, K.; Chomiuk, L. +2 more
We present a summary of Swift and Suzaku X-ray observations of the 2010 nova outburst of the symbiotic star, V407 Cyg. The Suzaku spectrum obtained on day 30 indicates the presence of the supersoft component from the white dwarf surface, as well as optically thin component from the shock between the nova ejecta and the Mira wind. The Swift observa…
Isolated Sunspot with a Dark Patch in the Coronal Emission
Shibasaki, K.; Ryabov, B. I.; Bezrukov, D. A.
On the base of the 17 GHz radio maps of the Sun taken with the Nobeyama Radio Heliograph we estimate plasma parameters in the specific region of the sunspot atmosphere in the active region AR 11312. This region of the sunspot atmosphere is characterized by the depletion in coronal emission (soft X-ray and EUV lines) and the reduced absorption in t…
The Lower Main Sequence of Stars in the Solar Neighborhood: Model Predictions versus Observation
Sperauskas, J.; Bartašiūtė, S.; Deveikis, V. +1 more
We have used the Simbad database and VizieR catalogue access tools to construct the observational color--absolute magnitude diagrams of nearby K--M dwarfs with precise Hipparcos parallaxes (σ π /π ≤ 0.05). Particular attention has been paid to removing unresolved double/multiple stars and variables. In addition to archival data, we have…
Large Astronomical Surveys, Catalogs and Databases
Mickaelian, A. M.
We review the status of all-sky and large astronomical surveys and their catalogued data over the whole range of electromagnetic spectrum, from gamma-ray to radio, such as ROSAT in X-ray, GALEX in UV, SDSS and several POSS1/2 based catalogs (APM, MAPS, USNO, GSC) in optical, 2MASS and WISE in NIR, IRAS and AKARI in MIR/FIR, NVSS and FIRST in radio…
RR Tel: Determination of Dust Properties during Minimum Obscuration
Jurkić, T.; Kotnik-Karuza, D.
The ISO infrared spectra and the SAAO long-term JHKL photometry of RR Tel in the epochs during minimum obscuration are studied in order to construct a circumstellar dust model. The spectral energy distribution in the near- and the mid-IR spectral range (1--15 µ m) was obtained for an epoch without the pronounced dust obscuration. The DUSTY c…
A Composite Light Curve Model of the Symbiotic Nova PU Vul (1979)
Mikołajewska, J.; Kato, M.; Hachisu, I.
PU Vul (1979) is a symbiotic nova that shows a long-lasting flat optical peak followed by a slow decline. We made a quasi-evolution model for outbursts on a 0.6 M⊙ white dwarf consisting of a series of static solutions with optically-thin winds. Our theoretical models reproduce well the observed visual/UV light curves as well as the new…
Kinematic Modeling of Distant Galaxies
Kipper, Rain; Tempel, Elmo; Tamm, Antti
Evolution of galaxies is one of the most actual topics in astrophysics. Among the most important factors determining the evolution are two galactic components which are difficult or even impossible to detect optically: the gaseous disks and the dark matter halo. We use deep Hubble Space Telescope images to construct a two-component (bulge + disk) …
Multiwavelength SED as a Tool in Understanding Outbursts of Symbiotic Binaries
Skopal, A.
Symbiotic binaries consist of a few sources of radiation contributing to spectral energy distribution (SED) from hard X-rays to radio wavelengths. To identify the basic physical processes forming the observed spectrum, we have to disentangle the composite SED into its individual components of radiation, i.e., to determine their physical parameters…