Search Publications
Hot bubbles of planetary nebulae with hydrogen-deficient winds. III. Formation and evolution in comparison with hydrogen-rich bubbles
Steffen, M.; Schönberner, D.
Aims: We seek to understand the evolution of Wolf-Rayet central stars by comparing the diffuse X-ray emission from their windblown bubbles with that from their hydrogen-rich counterparts with predictions from hydrodynamical models.
Methods: We simulate the dynamical evolution of heat-conducting wind-blown bubbles using our 1D radiation-h…
Valley Relief of the Northeastern Part of Terra Cimmeria on Mars
Mukhamedzhanova, A. E.
A study of the valley topography of the northeastern part of Terra Cimmeria on Mars was carried out. The results of the study allow us to draw the following conclusions. (1) The morphology of the studied valley systems corresponds to their presumed fluvial origin. (2) The remains of the paleodelta in the Gusev crater, fragments of terrace levels t…
Search for the wide-orbit massive companion of XO-7b in the follow-up radial-velocity and transit-timing data: no significant clues
Garai, Z.; Pribulla, T.; Komžík, R.
XO-7b is a hot Jupiter transiting a V = 10.52 mag G0V-type star. The planetary system is interesting because the linear slope in the discovery radial-velocity (RV) data indicated a wide-orbit massive companion. In 2020 we started an RV campaign for the system with the main scientific goal to follow-up this linear slope, and to put constraints on t…
Investigation of WZ Sge-type Dwarf Nova ASASSN-19oc: Optical Spectroscopy and Multicolor Light Curve Analysis
Krushevska, Viktoriia; Shugarov, Sergey; Ochner, Paolo +3 more
In this study, we present an investigation of the newly discovered dwarf nova ASASSN-19oc during its superoutburst on 2019 June 2. We carried out detailed UBVR c I c -photometric observations and also obtained a spectrum on day 7 of the outburst, which shows the presence of hydrogen absorption lines commonly found in dwarf…
Origin of Line Broadening in Fading Granules: Influence of Small-scale Turbulence
Katsukawa, Yukio; Ishikawa, Ryohtaroh T.
In the quiet region of the solar photosphere, turbulent convective motions of the granular flows naturally drive the subgranular-scale flows. However, evaluating such small-scale velocities is challenging because of the limited instrumental resolution. Our previous study, R. T. Ishikawa et al., found line-broadening events during the fading proces…
Gaia Data Release 3: Distribution of Spectral Groups of Near-Earth Asteroids
Kovaleva, D. A.; Shcherbina, M. P.; Shustov, B. M.
Based on the data from the third edition of the Gaia catalog, containing the reflectance spectra of asteroids, studies of near-Earth asteroids (NEAs) were carried out. The reflectance spectra of about 100 representatives of the Aten, Apollo and Amor groups were used to determine their spectral class. For 47 asteroids such an assessment was made fo…
The Lockman-SpReSO project. Galactic flows in a sample of far-infrared galaxies
Krongold, Yair; Gallego, Jesús; Sánchez-Portal, Miguel +21 more
Context. The Lockman-SpReSO project is an optical spectroscopic survey of 956 far-infrared (FIR) objects within the Lockman Hole field limited by magnitude RC(AB) < 24.5. Fe II and Mg II absorption lines have been detected in 21 out of 456 objects with a determined spectroscopic redshift in the catalogue. The redshifts of these objec…
Properties of a fading AGN from SDSS-IV MaNGA
Bizyaev, Dmitry; Gu, Qiu-Sheng; Shi, Yong +7 more
We identify a fading AGN SDSS J220141.64+115124.3 from the internal Product Launch-11 (MPL-11) in Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The central region with a projected radius of $\sim$2.4 kpc is characterized as LINER-like line ratios while the outskirts extended to $\sim$15 kpc show Seyfert-like line ratios. The …
Pulling Back the Curtain on Shocks and Star Formation in NGC 1266 with Gemini-NIFS
Heckman, Timothy; Aalto, Susanne; Ogle, Patrick +21 more
We present Gemini near-infrared integral field spectrograph K-band observations of the central 400 pc of NGC 1266, a nearby (D ≈ 30 Mpc) post-starburst galaxy with a powerful multiphase outflow and a shocked interstellar medium. We detect seven H2 rovibrational emission lines excited thermally to T ∼ 2000 K, and weak Brγ emission, consi…
High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616)
Hubrig, Swetlana; Parthasarathy, Mudumba; Sarkar, Geetanjali +2 more
An analysis of the high-resolution (