Search Publications
Study of an Intermediate Age Open Cluster IC 1434 Using Ground-Based Imaging and Gaia DR2 Astrometry
Bisht, D.; Hendy, Y. H. M.
We present a detailed photometric and kinematical analysis of the poorly studied open cluster IC 1434 using CCD VRI, APASS, and Gaia DR2 database for the first time. By determining the membership probability of stars we identify the 238 most probable members with a probability higher than 60% by using proper motion and parallax data as taken from …
Landform evolution of Oudemans crater and its bounding plateau plains on Mars: Geomorphological constraints on the Tharsis ice-cap hypothesis
Day, Mackenzie; Yin, An; Moon, Seulgi
In this study we address the question of whether the Tharsis rise that occupies ~25 % of the surface area of Mars was once covered by an ice cap, and the sudden ice-cap melting was responsible for the catastrophic development of the Late Hesperian (3.5-3.6 Ga) circum-Tharsis giant (>1000s km in length) outflow channels. To achieve this goal, we…
Symmetry properties and widths of the filamentary structures in the Orion A giant molecular cloud
Zheng, Yu-Qing; Wang, Hong-Chi; Ma, Yue-Hui +1 more
We identify 225 filaments from an H2 column density map constructed using simultaneous 12CO, 13CO and C18O (J = 1-0) observations carried out as a part of the Milky Way Imaging Scroll Painting (MWISP) project.We select 46 long filaments with lengths above 1.2 pc to analyze the filament column density pro…
Influence of the Galactic bar on the kinematics of the disc stars with Gaia EDR3 data
Melnik, A. M.; Dambis, A. K.; Berdnikov, L. N. +1 more
A model of the Galaxy with the outer ring R1R2 can explain the observed distribution of the radial, VR, and azimuthal, VT, velocity components along the Galactocentric distance, R, derived from the Gaia EDR3 data. We selected stars from the Gaia EDR3 catalogue with reliable parallaxes, proper motions, an…
Tracing the magnetic field morphology of the LDN 1172/1174 cloud complex
Kim, Shinyoung; Sharma, Ekta; Saha, Piyali +3 more
Context. The LDN 1172/1174 cloud complex in the Cepheus Flare region presents a hub-filament structure with the reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, which consists of the hub with a ~5 pc long narrow filament attached to it. Formation of a sparse cluster of low- and intermediate-mass stars is presently taking pl…
Prospects of direct detection of 48V gamma-rays from thermonuclear supernovae
Ruiter, Ashley J.; Siegert, Thomas; Panther, Fiona H. +3 more
Detection of gamma-rays emitted by radioactive isotopes synthesized in stellar explosions can give important insights into the processes that power transients such as supernovae, as well as providing a detailed census of the abundance of different isotope species relevant to the chemical evolution of the Universe. Observations of nearby supernovae…
Constraining the Positive Ion Composition in Saturn's Lower Ionosphere with the Effective Recombination Coefficient
Vigren, Erik; Wahlund, Jan-Erik; Dreyer, Joshua +4 more
The present study combines Radio and Plasma Wave Science/Langmuir Probe and Ion and Neutral Mass Spectrometer data from Cassini's last four orbits into Saturn's lower ionosphere to constrain the effective recombination coefficient α300 from measured number densities and electron temperatures at a reference electron temperature of 300 K.…
Modeling of CO Rovibrational Line Emission of HD 141569
Najita, Joan R.; Brittain, Sean D.; Carr, John S. +1 more
HD 141569 is a Herbig Ae/Be star that straddles the boundary between the transition disks and debris disks. It is a low dust mass disk that reveals numerous structural elements (e.g., gaps and rings) that may point to young planets. It also exhibits a reservoir of CO gas observed at both millimeter and IR wavelengths. Previous observations reporte…
Suzaku detection of solar wind charge exchange emission from a variety of highly ionized ions in an interplanetary coronal mass ejection
Katsuda, Satoru; Ezoe, Yuichiro; Yoneyama, Tomokage +8 more
X-ray emission generated through solar-wind charge exchange (SWCX) is known to contaminate X-ray observation data, the amount of which is often significant or even dominant, particularly in the soft X-ray band, when the main target consists of comparatively weak diffuse sources, depending on the space weather during the observation. In particular,…
First year of coordinated science observations by Mars Express and ExoMars 2016 Trace Gas Orbiter
Gondet, B.; Ristic, B.; López-Valverde, M. A. +12 more
Two spacecraft launched and operated by the European Space Agency are currently performing observations in Mars orbit. For >15 years Mars Express has been conducting global surveys of the surface, the atmosphere and the plasma environment of the Red Planet. The Trace Gas Orbiter, the first element of the ExoMars programme, began its science pha…