Search Publications
Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have studied the kinematic properties of the candidates for hot subdwarfs (HSDs) selected by Geier et al. from theGaiaDR2 catalogue. We have used a total of 12 515 stars with relative trigonometric parallax errors less than 30%. The HSDs are shown to have different kinematics, depending on their positions on the celestial sphere. For example, t…
Active experiments beyond the Earth: Plasma effects of sounding radar operations in the ionospheres of Venus, Mars, and the Jovian system
Barabash, Stas; Holmstrom, Mats; Frahm, Rudy A. +1 more
Operation of powerful satellite- and rocket-born sounding radars is often accompanied by a heating/acceleration of the local electrons and ions. Intense fluxes of sounder accelerated particles were detected in Earth's ionosphere when the frequency of the radar transmitter was close to one of the fundamental plasma resonances: harmonic of the elect…
Seismological Determination of the Alfvén Speed and Plasma Beta in Solar Photospheric Bright Points
Moon, Yong-Jae; Cho, Kyung-Suk; Kim, Yeon-Han +7 more
The Alfvén speed and plasma beta in photospheric bright points (BPs) observed by the Broadband Filter Imager (BFI) of the Solar Optical Telescope on board the Hinode satellite are estimated seismologically. The diagnostics is based on the theory of slow magnetoacoustic waves in a non-isothermally stratified photosphere with a uniform vertical magn…
Formation of Central Pits in Impact Craters on Mars: A Statistical Investigation of Proposed Mechanisms
Burr, Devon M.; Peel, Samantha E.; Tran, Liem
Central pit craters (CPCs) are complex craters that exhibit depressions within their floors or central uplifts. Some proposed models for central pit formation can be grouped by similar mechanism: (A) explosive volatile release, (B) central peak collapse, and (C) drainage of subsurface melted volatiles. We test these groups of mechanisms for centra…
Isolated High-Density Structures in Magnetic Anomaly Regions of the Martian Lower Ionosphere
Venkateswara Rao, N.; Leelavathi, V.; Mohanamanasa, P. +1 more
The occurrence of density structures in magnetic anomaly regions is one of the prominent features of the Martian ionosphere. These structures, in general, occur at altitudes above the main peak. In the present study, we analyze four cases of unusually strong oblique echoes that occur in magnetic anomaly regions and are observed by the Mars Express…
Detection of an excessively strong 3-µm absorption near the lunar highland crater Dufay
Wöhler, C.; Grumpe, A.; Bhatt, M. +3 more
Using the near-infrared spectral reflectance data of the Chandrayaan-1 Moon Mineralogy Mapper (M3) instrument, we report an unusually bright structure of 30 × 60 km2 on the lunar equatorial farside near crater Dufay. At this location, the 3-µm absorption band feature, which is commonly ascribed to hydroxyl (OH) and/or w…
Molecular clumps towards compact H II regions
Gómez, M.; Rubio, M.; Cappa, C. E. +1 more
To better understand how the H II regions can affect their surrounding molecular clouds we have studied the molecular distribution towards three compact H II regions associated with IRAS sources (08140-3559, 09014-4736, and 09026-4842) by means of the observations of 12CO, 13CO, and C18O molecules in the J = 3-2 tr…
Constraints on the number of X‑ray pulsars in IC 10 from a deep XMM‑Newton observation
Wik, D. R.; Yang, J.; Laycock, S. G. T.
We report the most sensitive search yet for X‑ray pulsars in the dwarf starburst galaxy IC 10, which is known to contain a population of young, high‑mass X‑ray binaries. We searched for pulsations in 207 point‑like X‑ray sources in the direction of IC 10 by a 2012 XMM‑Newton observation with a total exposure time of 134.5 ks. Pulsation searches in…
Improvement of positional accuracy of Solar system bodies ground-based observations with CCD-imaging of close approaches of them with Gaia stars
Bikulova, D. A.
Current release of the Gaia mission provides representation of a new reference frame on an unprecedent level of accuracy. This astrometric catalogue is practically free of systematic errors with respect to astrometric ground-based observations. First applications Gaia DR1 and Gaia DR2 as a reference in an analysis of CCD-observations of asteroids …
a Generic Rigorous Sensor Model for Photogrammetric Processing of Pushbroom Planetary Images
Geng, X.; Xu, Q.; Xing, S.
Currently, each planetary exploration mission team always develops its own software modules to support the photogrammetric processing of planetary images, and as a result of that the main drawbacks are lacking software reusability and the high cost of software development and maintenance. This is mainly due to that there is lack of a highly univer…