Search Publications
Eight New Substellar Hyades Candidates from the UKIRT Hemisphere Survey
Cushing, Michael C.; Schneider, Adam C.; Faherty, Jacqueline K. +16 more
We have used the UKIRT Hemisphere Survey combined with the UKIDSS Galactic Cluster Survey, the UKIDSS Galactic Plane Survey, and the CatWISE2020 catalog to search for new substellar members of the nearest open cluster to the Sun, the Hyades. Eight new substellar Hyades candidate members were identified and observed with the Gemini/GNIRS near-infra…
Fundamental Parameters of a Binary System Consisting of a Red Dwarf and a Compact Star
Ding, Xu; Ji, KaiFan; Song, ZhiMing +7 more
TIC 157365951 has been classified as a δ Scuti type by the International Variable Star Index. Through the spectra from Large Sky Area Multi-Object Fiber Spectroscopic Telescope and its light curve, we further discovered that it is a binary system. This binary system comprises a red-dwarf star and a compact star. Through the spectral energy distrib…
Low-mass Stellar and Substellar Candidate Companions around Massive Stars in Sco OB1 and M17
Sana, Hugues; Mahy, Laurent; Reggiani, Maddalena +1 more
Massive stars are recognized for their high degree of multiplicity, yet the mass ratio regime below 0.1 remains insufficiently explored. It is therefore unknown whether extremely low-mass (possibly substellar) companions can form and survive in the direct UV-irradiated environment of massive stars. In this paper, we discuss Very Large Telescope/Sp…
KIC 6362386: An Eclipsing Binary with γ Doradus–type Pulsations and Starspots
Zhang, Xiaobin; Zong, Weikai; Wang, Jiaxin +5 more
KIC 6362386 is an eclipsing binary system that exhibits both γ Doradus (γ Dor)–type pulsations and starspots. In this study, we investigated this binary system using the Kepler photometry and the spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. After employing the PHOEBE program for light-curve and radial-velo…
Alpha Element Populations Among Local Halo Stars
Laird, John B.; Reinhard, Michael V.
Previous studies have shown that the halo of the Milky Way galaxy is made up of two distinct stellar populations, one from dissipative collapse and the other accreted. Elemental abundances with small relative uncertainties along with kinematics are determined for 20 local halo stars in the metallicity range -2.2 ≤ [Fe/H] ≤-1.2. Stars with metallic…
Light Curves and Period Analysis of Beta Lyrae Stars
Mennickent, R. E.; Garcés, J.; Cortés, C. C. +1 more
We present the light-curve period analysis of 36 Beta Lyrae stars from the OMC Archive. We check the reference period of the sample by applying the phase dispersion minimization periodogram. From our research, we determine the orbital period of five stars in the sample. One of them is CP Psc, showing a prominent hump in the light curve before the …
Foreground Dust Properties toward the Cluster NGC 7380
Hoang, Thiem; Ganesh, Shashikiran; Medhi, Biman J. +4 more
Using starlight polarization, we present the properties of foreground dust toward cluster NGC 7380 embedded in H II region Sh 2-142. Observations of starlight polarization are carried out in four filters using an imaging polarimeter equipped with a 104 cm ARIES telescope. Polarization vectors of stars are aligned along the Galactic magnetic field.…
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…
The Stellar Content of the Young Open Cluster Berkeley 50 (IC 1310)
Massey, Philip; Speckert, Meghan; Skiff, Brian A.
We observed the Galactic open cluster Berkeley 50 in order to determine its stellar content, distance, and age. We obtained UBV photometry of 1145 stars in a 12.'3 × 12.'3 field, and used Gaia proper motions and parallaxes to identify 64 members, of which we obtained spectra of the 17 brightest members. The majority of the observed population we c…