Search Publications
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…
Exploring the Diversity of Faint Satellites in the M81 Group
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +9 more
In the last decade, we have been able to probe further down the galaxy luminosity function than ever before and expand into the regime of ultra-faint dwarfs (UFDs), which are some of the best probes we have of small-scale cosmology and galaxy formation. Digital sky surveys have enabled the discovery and study of these incredibly low-mass, highly d…
On the Origin of Infrared Bands Attributed to Tryptophan in Spitzer Observations of IC 348
McGuire, Brett A.; Jørgensen, Jes K.; Schroetter, Ilane +12 more
Infrared emission features toward interstellar gas of the IC 348 star cluster in Perseus have been recently proposed to originate from the amino acid tryptophan. The assignment was based on laboratory infrared spectra of tryptophan pressed into pellets, a method which is known to cause large frequency shifts compared to the gas phase. We assess th…
Study of Solar Motion and Galactic Kinematical Characteristics Using Recent Gaia Data
Elsanhoury, W. H.; Ayari, N.
Our objective is to construct models of the velocity ellipsoid and the retrieved Solar motion for program stars with 4924 points within the Solar neighborhood (∼2 kpc). In which 1374 early types (B5, A0, A5, F0, and F5) and about 3550 late types (G0, G5, K0, and K5) with more recent data source with Gaia DR3. Based on space velocity vectors $(\bar…