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Comparison of the Orbital Properties of the Milky Way Globular Clusters from the Data of the Gaia DR2 and EDR3 Catalogs
Bobylev, V. V.; Bajkova, A. T.
We provide new values of the orbital parameters of 152 globular clusters, which are calculated using the new mean proper motions obtained from the Gaia EDR3 catalog data. The orbits were integrated 5 Gyr back in an axisymmetric three-component potential with a spherical bulge, disk component, and spherical dark halo in the Navarro-Frenk-White form…
Limits on the contribution of early endogenous radiolysis to oxidation in carbonaceous chondrites' parent bodies
Mousis, Olivier; Miller, Kelly E.; Bouquet, Alexis +1 more
Context. Carbonaceous chondrites have undergone alteration in their parent bodies and display oxidized secondary phases, including sulfates in CI and CM chondrites. The cause of the formation of these sulfates is yet to be determined.
Aims: This study investigates the potential of endogenous radiolysis of water (i.e., radiolysis caused by rad…
3D Parameter Maps of Red Clump Stars in the Milky Way: Absolute Magnitudes and Intrinsic Colors
Wang, Shu; Chen, Xiaodian
Red clump stars (RCs) are useful tracers of distances, extinction, chemical abundances, and Galactic structures and kinematics. Accurate estimation of RC parameters-absolute magnitude and intrinsic color-is the basis for obtaining high-precision RC distances. By combining astrometric data from Gaia; spectroscopic data from APOGEE and LAMOST; and m…
Touching the Stars: Using High-resolution 3D Printing to Visualize Stellar Nurseries
Forbes, John C.; Imara, Nia; Weaver, James C.
Owing to their intricate variable density architecture, and as a principal site of star formation, molecular clouds represent one of the most functionally significant, yet least understood features of our universe. To unravel the intrinsic structural complexity of molecular clouds, here we leverage the power of high-resolution bitmap-based three-d…
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…