Search Publications
Evaluation of In-Orbit Thermal Performance of X-Ray Astronomy Satellite ``Hitomi''
Kokubun, Motohide; Takahashi, Tadayuki; Takei, Yoh +7 more
Phase-dependent Photometric and Spectroscopic Characterization of the MASTER-Net Optical Transient J212444.87+321738.3: An Oxygen-rich Mira
Banerjee, D. P. K.; Hambsch, Franz-Josef; Dutta, Somnath +4 more
We describe the time-dependent properties of a new spectroscopically confirmed Mira variable, which was discovered in 2013 as MASTER-Net Optical Transient J212444.87+321738.3 toward the Cygnus constellation. We have performed long-term optical/near-infrared (NIR) photometric and spectroscopic observations to characterize the object. From the optic…
An ultraviolet study of B[e] stars: evidence for pulsations, luminous blue variable type variations and processes in envelopes
Krtička, J.; Krtičková, I.
Stars that exhibit a B[e] phenomenon comprise a very diverse group of objects in a different evolutionary status. These objects show common spectral characteristics, including the presence of Balmer lines in emission, forbidden lines and strong infrared excess due to dust. Observations of emission lines indicate illumination by an ultraviolet ioni…
Dwarf irregular galaxy Leo A extends even farther, according to HST WFC3 photometry
Vansevičius, V.; Stonkutė, R.; Čeponis, M. +2 more
Context. Leo A is an isolated gas-rich dwarf irregular galaxy of low stellar mass and metallicity residing at the outskirts of the Local Group. Ages of the stellar populations in Leo A range from 10 Myr to 10 Gyr. A large stellar halo (up to the deprojected distance of 1.7 kpc) was discovered based on Subaru wide-field photometry of red giant bran…
Astrometric Observations of the Galilean Moons of Jupiter at the Pulkovo Normal Astrograph in 2016-2017
Khovrichev, M. Yu.; Narizhnaya, N. V.; Apetyan, A. A. +6 more
We present the results of observations of the Galilean moons of Jupiter carried out at the Normal Astrograph of the Pulkovo Observatory in 2016-2017. We obtained 761 positions of the Galilean moons of Jupiter in the system of the Gaia DR1 catalog (ICRF, J2000.0) and 854 differential coordinates of the satellites relative to each other. The mean er…
A Suzaku X-ray study of the mixed-morphology supernova remnant Kes 69 and searching for its gamma-ray counterpart
Sezer, A.; Yamazaki, R.; Ergin, T. +2 more
Kes 69 is a mixed-morphology (MM) supernova remnant (SNR) that is known to be interacting with molecular clouds based on 1720 MHz hydroxyl (OH) maser emission observations in the northeastern and southeastern regions. We present an investigation of Kes 69 using ∼67 ks Suzaku observation. The X-ray spectrum of the whole SNR is well fitted by a non-…
Added-value interfaces to asteroid photometric and spectroscopic data in the Gaia database
Muinonen, Karri; Granvik, Mikael; O'Mullane, William +7 more
We present two added-value interfaces (AVIs) for analyzing photometric and spectroscopic data observed by the Gaia satellite. The Gaia Added-Value Interface for Temporal Analysis (GAVITEA) is used to calculate an estimate for the spin state and shape of an asteroid from its photometric data, and the Gaia Added-Value Interface for Spectral Classifi…
Collapse-driven formation of depressions on comet 67P/Churyumov-Gerasimenko
Leliwa-Kopystynski, J.
The extremely diverse surface of comet 67P/Churyumov-Gerasimenko contains a large number of depressions or craters of very different scales. Among the most prominent are two large roughly circular depressions, each with radii of several hundred meters. In this work a model for the formation of the depressions is proposed. It is based on the theory…
SMHASH: a new mid-infrared RR Lyrae distance determination for the Local Group dwarf spheroidal galaxy Sculptor
Majewski, Steven R.; Madore, Barry F.; Freedman, Wendy L. +12 more
We present a new distance estimation for the Milky Way dwarf spheroidal satellite Sculptor obtained from multi-epoch mid-infrared observations of RR Lyrae stars (RRLs). The 3.6 µm observations have been acquired with the Infrared Array Camera onboard the Spitzer Space Telescope as part of the SMHASH program. Mid-infrared light curves for 42 …
Probing the dynamical state, baryon content, and multiphase nature of galaxy clusters with bright background QSOs
Tripp, Todd M.; Burchett, Joseph N.; Wang, Q. Daniel +5 more
We have initiated a programme to study the physical/dynamical state of gas in galaxy clusters and the impact of the cluster environment on gaseous haloes of individual galaxies using X-ray imaging and UV absorption line spectroscopy of background QSOs. Here, we report results from the analysis Chandra and XMM-Newton archival data of five galaxy cl…