Search Publications
On the nature of apparent transient sources on the National Geographic Society-Palomar Observatory Sky Survey glass copy plates
Hambly, N. C.; Blair, A.
We examine critically recent claims for the presence of above-atmosphere optical transients in publicly available digitized scans of Schmidt telescope photographic plate material derived from the National Geographic Society-Palomar Observatory Sky Survey. We employ the publicly available SuperCOSMOS Sky Survey catalogues to examine statistically t…
A and F spectral type runaway star candidates in the 30 Doradus region
Gebrehiwot, Yikdem Mengesha; Teklehaimanot, Berhe Tewelde
The relative proper motions of eight A-F type runaway candidate stars, from the eleven cataloged stars by Platais et al. (2018) in the 30 Doradus (30 Dor) region of the Large Magellanic Cloud (LMC), are investigated using Gaia DR3 data. We cross-matched the coordinates presented by the authors with Gaia DR3 coordinates, and we took only eight star…
XMM-SERVS X-ray extended Galaxy Cluster (XVXGC) catalog
Jiang, Linhua; Luo, Bin; Erben, Thomas +4 more
Context. To explain the well-known tension between cosmological parameter constraints obtained from the primary cosmic microwave background (CMB) and those drawn from X-ray-selected galaxy cluster samples identified with early data, we propose a possible explanation for the incompleteness of detected clusters being higher than estimated. Specifica…
3D Morphology and Motions of the Canis Major Region from Gaia DR3
Xu, Ye; Sun, Yan; Liu, Dejian +4 more
The Canis Major (CMa) region is known for its prominent arc-shaped morphology, visible at multiple wavelengths. This study integrates molecular gas data with high-precision astrometric parameters of young stellar objects (YSOs) from Gaia DR3 to provide the first three-dimensional (3D) insights into the dynamical evolution and star formation histor…
Error Analysis for Rotating-drift-scan Charge-coupled Device Observation of Near-Earth Asteroids
Tang, Zhenghong; Yu, Yong; Pomazan, Anton +4 more
The apparent velocities of near-Earth asteroids (NEAs) are usually high when they pass by Earth. Observing these fast-moving objects with long exposure times would cause their images to streak and significantly decrease the precision of astronomical measurements. The rotating-drift-scan (RDS) charge-coupled device technique is a promising approach…
Comparison of N-body simulations with Gaia DR3 data from OB associations
Villanova, S.; Assmann, P.; Bascuñán, M. +1 more
Over the years, studies of OB associations have increased due to the fact that more massive stars allow for a better understanding of star formation. Thus, different simulations have been developed with the aim to better understand the main characteristics of these groups and to analyze the different theories about the formation of these associati…
The morphology and kinematics of the galaxy group AM 1054-325: A MUSE perspective
Jadhav, Vikrant V.; Yadav, Jyoti
Galaxy interactions in groups can lead to intense starbursts and the activation of active galactic nuclei (AGNs). The stripped gas from the outer disk can lead to star-forming clumps along the tidal tails or sometimes tidal dwarf galaxies. We investigate the impact of interaction on various galaxy properties, including morphology, star formation r…
Digging deeper into the dense Galactic globular cluster Terzan 5 with electron-multiplying CCDs: Variable star detection and new discoveries
Snodgrass, C.; Horne, K.; Catelan, M. +20 more
Context. High frame-rate imaging was employed to mitigate the effects of atmospheric turbulence (seeing) in observations of globular cluster Terzan 5. Aims. High-precision time-series photometry with the highest angular resolution so far has been obtained for the crowded central region of Terzan 5. Observations were carried out using ground-based …
Multitechnique study of the B[e] supergiant RMC 82
Carciofi, A. C.; Seriacopi, D. B.; de Amorim, T. H. +9 more
B[e] supergiants (sgB[e]) are rare objects whose evolutionary stage remains uncertain. Observationally, they display strong Balmer emission lines, infrared excess, and intrinsic polarization, indicating a non-spherical circumstellar envelope. We present a study of the sgB[e] RMC 82, using new spectropolarimetric data complemented by photometry fro…
Spectroscopic and photometric investigations of the totally eclipsing contact binary V1320 Cas
Li, Kai; Gao, Xing; Liu, Jian-Fei +4 more
We analyzed the light curve of the total eclipse contact binary V1320 Cas, obtained reliable photometric solutions, confirmed it to be a W-type contact binary with a mass ratio of 3.404 and a contact degree of 23.9%, a cool spot is discovered on the less massive component. Orbital period analysis indicates that the period of V1320 Cas is decreasin…