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Fundamental parameters for double-lined spectroscopic and detached eclipsing binary system J064726.39 + 223431.6
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +1 more
We present a study of the detached eclipsing binary J064726.39 + 223431.6 using spectra from the LAMOST medium-resolution spectra and Transiting Exoplanet Survey Satellite photometry. We use full-spectrum fitting to derive radial velocities and spectral parameters: ${T_{\rm eff}}_{A,B}=6177,\, 5820$ K, $V \sin {i}_{A,B}=59,\, 50~\, {\rm km}\, {\rm…
An SMA Survey of Chemistry in Disks Around Herbig AeBe Stars
Wilner, David J.; Andrews, Sean M.; Huang, Jane +6 more
Protoplanetary disks around Herbig AeBe stars are exciting targets for studying the chemical environments where giant planets form. Save for a few disks, however, much of Herbig AeBe disk chemistry is an open frontier. We present a Submillimeter Array ~213-268 GHz pilot survey of millimeter continuum CO isotopologs and other small molecules in dis…
Mapping NGC 7027 in New Light: CO+ and HCO+ Emission Reveal Its Photon- and X-Ray-dominated Regions
Wilner, David J.; Montez, Rodolfo; Kastner, Joel H. +7 more
The young and well-studied planetary nebula (PN) NGC 7027 harbors significant molecular gas that is irradiated by luminous, pointlike UV (central star) and diffuse (shocked nebular) X-ray emission. This nebula represents an excellent subject to investigate the molecular chemistry and physical conditions within photon- and X-ray-dominated regions (…
Gravitational collapse and accretion flows in the hub filament system G323.46-0.08
Li, Dalei; Tang, Xindi; Zhou, Jianjun +9 more
We studied the hub-filament system G323.46-0.08 based on archival molecular line data from the SEDIGISM 13CO survey and infrared data from the GLIMPSE, MIPS, and Hi-GAL surveys. G323.46-0.08 consists of three filaments, F-north, F-west, and F-south, that converge toward the central high-mass clump AGAL 323.459-0.079. F-west and Part1 of…
Radio transients and variables in the tenth Deeper, Wider, Faster observing run
Möller, A.; Abbott, T. M. C.; Zhang, J. +23 more
The Deeper, Wider, Faster (DWF) program coordinates observations with telescopes across the electromagnetic spectrum, searching for transients on time-scales of milliseconds to days. The tenth DWF observing run was carried out in near real-time during September 2021, and consisted of six consecutive days of observations of the NGC 6744 galaxy grou…
Exploring the origin of the extended main-sequence turn-off in M37 through the white dwarf cooling sequence
Salaris, M.; Anderson, J.; Bedin, L. R. +3 more
We use new observations from the Canada-France-Hawaii Telescope to study the white dwarf cooling sequence of the open cluster M37, a cluster that displays an extended main-sequence turn-off and, according to a recent photometric analysis, also a spread of initial chemical composition. By taking advantage of a first epoch collected in 1999 with the…
The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts
Esposito, Paolo; Auchettl, Katie; Vasilopoulos, Georgios +8 more
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable phenomena in the 0.3-10 keV energy band. We include gamma-ray burst afterglows, supernovae, superno…
Identifying 46 New Open Cluster Candidates in Gaia EDR3 Using a Hybrid pyUPMASK and Random Forest Method
Wang, Feng; Li, Zhongmu; Chi, Huanbin +1 more
Open clusters (OCs) are regarded as tracers to understand stellar evolution theory and validate stellar models. In this study, we presented a robust approach to identifying OCs. A hybrid method consisting of pyUPMASK and the random forest (RF) algorithm is first used to remove field stars and determine more reliable members. An identification mode…
Reconnection-generated Plasma Flows in the Quasi-separatrix Layer in Localized Solar Corona
Srivastava, Abhishek K.; Kayshap, Pradeep; Pontin, David I. +8 more
Multiwavelength observations of the propagating disturbances (PDs), discovered by Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO), are analyzed to determine their driving mechanism and physical nature. Two magnetic strands in the localized corona are observed to approach and merge with each other, followed by the gener…
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
Beers, Timothy C.; Lee, Young Sun; An, Deokkeun +2 more
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber Spectroscopic Telescope. When divided into two groups, a low-[α/Fe] population (LAP) and a high-[α/F…