Search Publications
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…
A Current Application of the Methods of Secular and Statistical Parallax
Turner, D. G.
The methods of secular and statistical parallax for homogeneous groups of Galactic stars are applied in a practical (classroom) exercise to establish the luminosity of bright B3 V stars. The solar motion of 20 km s-1 relative to group stars exceeds their random velocities of ±10 km s-1, a condition adopted for preference of s…
GRB Prompt X-ray Emission
Sakamoto, Takanori
I present the observational properties of the prompt emission of supernova associated GRBs (SN-GRBs) focusing on temporal and spectral characteristics. I compare the properties of SN-GRBs with typical long GRBs to see whether there is a distinct difference or not. Furthermore, I present our attempt to search for hard X-ray emission prior to the di…
Solar Magnetic Fields as a Clue for the Mystery of the Permanent Solar Wind and the Solar Corona
Nikolskaya, K. I.; Mogilevsky, M. A.
We analyze, generalize, and interpret the data for the permanent solar wind (PSW) velocities measured on board of Ulysses (SWOOPS). A finding of a principal importance extracted from Ulysses' observations is a discovery of the clear-cut inverse coupling between the SW velocities and the solar magnetic fields (SMF) (the stronger close MF, the slowe…
Erratum: X-Ray Study of the Outer Region of Abell 2142 with Suzaku
Hoshino, Akio; Sato, Kosuke; Ohashi, Takaya +4 more
In the paper [PASJ 63, S1019 (2012)], there was an error in the estimation of gas mass. The correct gas mass at the virial radius is 2.40±0.20 × 1014 M⊙. Thus, the gas mass fraction also changes from 14.4+7.1-4.1% to 21.8+10.7-6.3%. Although this value is still consistent with the w…
Analysis of energetic electron drop-outs in the upper atmosphere of Titan during flybys in the dayside magnetosphere of Saturn
Krupp, N.; Fränz, M.; Dougherty, M. K. +7 more
We discuss the high energy electron absorption signatures at Titan during the Cassini dayside magnetospheric encounters. We use the electron measurements of the Low Energy Measurement System of the Magnetospheric Imaging Instrument. We also examine the mass loading boundary based on the ion data of the Ion Mass Spectrometer sensor of the Cassini P…
Mass determination for visual binaries
Cvetković, Z.; Ninković, S.
We consider a sample of 432 visual binaries having orbital elements and belonging to the Main Sequence. We calculate their total masses using the orbital elements and the new Hipparcos parallaxes by applying Kepler's third law. For the same pairs the total masses are also found by applying the mass-luminosity relation. The source for the apparent …
The transterminator ion flow at Venus at solar minimum
Coates, A. J.; Kallio, E.; Grande, M. +10 more
The transterminator ion flow in the Venusian ionosphere is observed at solar minimum for the first time. Such a flow, which transports ions from the day to the nightside, has been observed previously around solar maximum. At solar minimum this transport process is severely inhibited by the lower altitude of the ionopause. The observations presente…
Neglected reverse Algol system: WZ Hor
Erdem, A.; Sürgit, D.
This paper presents the first analysis of spectroscopic and photometric observations of the eclipsing binary star WZ Hor. Observations of the system were made at the Mt. John University Observatory in 2007. Since the light contribution of the secondary component was merely 2-3% of the total light of the system in the optical wavelengths, the radia…
Are Pulsing Solitary Waves Running inside the Sun?
Wolff, Charles L.
A precise sequence of frequencies—detected four independent ways—is interpreted as a system of solitary waves below the Sun's convective envelope. Six future observational or theoretical tests of this idea are suggested. Wave properties (rotation rates, radial energy distribution, nuclear excitation strength) follow from conventional dynamics of g…