Search Publications
Missions
Journals
Publication Years
Ups and downs in the X-ray emission of the colliding wind binaries HD 168112 and HD 167971
Blomme, R.; Nazé, Y.; Rauw, G. +2 more
Context. The long-period O-star binary system HD 168112 and the triple O-star system HD 167971 are well-known sources of non-thermal radio emission that arises from a colliding wind interaction. The wind-wind collisions in these systems should result in phase-dependent X-ray emissions. The presence of a population of relativistic electrons in the …
Mutual occurrence ratio of planets - I. New clues to reveal origins of hot and warm Jupiter from the RV sample
Zhang, Hui; Zhou, Ji-Lin; Su, Xiang-Ning
Many studies have analysed planetary occurrence rates and their dependence on the host's properties to provide clues to planet formation, but few have focused on the mutual occurrence ratio of different kinds of planets. Such relations reveal whether and how one type of planet evolves into another, e.g. from a cold Jupiter (CJ) to a warm Jupiter (…
The ESO-VLT MIKiS survey reloaded: The internal kinematics of the core of M75
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +7 more
We present the results of a study aimed at characterizing the kinematics of the inner regions of the halo globular cluster M75 (NGC 6864) based on data acquired as part of the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galactic globular clusters. Our analysis includes the first determination of the line-of-sight velocity dispersion profi…
The outskirts of M33: Tidally induced distortions versus signatures of gas accretion
Burkert, Andreas; Corbelli, Edvige
Aims: We investigate a possible close encounter between M33 and M31 in the past to understand the role of galaxy-galaxy interactions in shaping the matter distribution in galaxy outskirts.
Methods: By examining a variety of initial conditions, we recovered possible orbital trajectories of M33, M31, and the Milky Way in the past, which ar…
Astronomical Test with CMOS on the 60 cm Telescope at the Xinglong Observatory, NAOC
Fan, Zhou; Zhang, Yu; Wu, Hong +2 more
This work shows details of an evaluation of an observational system comprising a complementary metal-oxide-semiconductor detector, 60 cm telescope and filter complement. The system's photometric precision and differential photometric precision, and extinction coefficients were assessed through observations of Supersky flat fields, open clusters, s…
The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud
Shi, Jianrong; Huang, Yang; Ma, Jun +5 more
Utilizing astrometric parameters sourced from Gaia Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric rest frame greater than 70% of their local escape velocity under the Gala MilkyWayPotential. Our analysis reveals that the majo…
Detection of the [C I] λ8727 emission line. Low-ionization structures in NGC 7009
Boumis, P.; Walsh, J. R.; Akras, S. +5 more
We report the first spatially resolved detection of the near-infrared [C I] λ8727 emission from the outer pair of low-ionization structures in the planetary nebula NGC 7009 from data obtained by the Multi Unit Spectroscopic Explorer integral field unit. This atomic carbon emission marks the transition zone between ionized and neutral gas and for t…
Study of a Red Clump Giant, KIC 11087027, with High Rotation and Strong Infrared Excess—Evidence of Tidal Interaction for High Lithium Abundance
Zhao, Gang; Reddy, Bacham E.; Pandey, Jeewan C. +2 more
This Letter presents results from Kepler photometric light curves and a high-resolution spectroscopic study of a super-Li-rich giant KIC11087027. Using the light-curve analysis, we measured the star's rotational period P rot = 30.4 ± 0.1 days, which translates to rotational velocity V rot = 19.5 ± 1.7 km s‑1. The s…
Science Opportunities for IMAP-Lo Observations of Interstellar Neutral Hydrogen and Deuterium during a Maximum of Solar Activity
Möbius, E.; Schwadron, N. A.; Bzowski, M. +1 more
Direct-sampling observations of interstellar neutral gas, including hydrogen and deuterium, have been performed for more than one cycle of solar activity by IBEX. The IBEX viewing is restricted to directions perpendicular to the spacecraft–Sun line, which limits the observations to several months each year. This restriction is removed in the forth…
Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters
Dixon, William V.
To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s-process elements in post-AGB stars in Galactic globular clusters. These species are mixed to the surface during third dredge-up (3DU) events, so their abundanc…