Search Publications
Turbulent Heating in Solar Wind Thermodynamics
Livadiotis, G.
This paper considers the concept of wave-particle thermodynamic equilibrium in order to improve our understanding of the role of turbulent heating in the solar wind proton plasma. The thermodynamic equilibrium in plasmas requires the energy of a plasmon—the quantum of plasma fundamental oscillation—to be balanced by the proton-magnetized plasma en…
Tracking the Footprints of the Radio Pulsar B1727-47: Proper Motion, Host Supernova Remnant, and the Glitches
Shternin, P.; Kirichenko, A.; Zyuzin, D. +4 more
The bright radio pulsar B1727-47, with a characteristic age of 80 kyr, was among the first pulsars discovered 50 yr ago. Using regular timing observations and its interferometric positions at three epochs, we measured, for the first time, the pulsar proper motion of 151 ± 19 mas yr-1. At the dispersion measure distance of ≳2.7 kpc, this…
First Detection of Submillimeter-wave [13C I] 3 P 1-3 P 0 Emission in a Gaseous Debris Disk of 49 Ceti with ALMA
Yamamoto, Satoshi; Higuchi, Aya E.; Oya, Yoko
We have detected the submillimeter-wave fine-structure transition (3 P 1-3 P 0) of 13C, [13C I], in the gaseous debris disk of 49 Ceti with the Atacama Large Millimeter/submillimeter Array (ALMA). Recently, the [C I] 3 P 1-3 P 0 emission h…
Dynamical Masses for the Triple System HD 28363 in the Hyades Cluster
Torres, Guillermo; Latham, David W.; Stefanik, Robert P.
The star HD 28363 in the Hyades cluster has been known for over a century as a visual binary with a period of 40 yr. The secondary is, in turn, a single-lined spectroscopic binary with a 21 day period. Here we report extensive spectroscopic monitoring of this hierarchical triple system that reveals the spectral lines of the third star for the firs…
Dissecting a Disk-instability Outburst in a Symbiotic Star: NuSTAR and Swift Observations of T Coronae Borealis during the Rise to the “Superactive” State
Nelson, T.; Mukai, K.; Sokoloski, J. L. +1 more
The current superactive state of the recurrent nova T Coronae Borealis (T CrB) has been observed with unprecedented detail. Previously published observations provide strong evidence that this state is due to an enhancement of the flow of material through the accretion disk, which increased the optical depth of its most internal region, the boundar…
Evidence of Hubble Flow-like Motion of Young Stellar Populations away from the Perseus Arm
Hernández, Jesús; Roman-Lopes, Alexandre; Tapia, Mauricio +2 more
In this Letter we present evidence of the coherent outward motion of a sample of young stars (t < 30 Myr) in the Perseus Arm, whose apparent origin is located in the vicinity of the W3/W4/W5 complex. Using astrometric and photometric data from the Gaia Data Release 2 catalog of an 8◦ radius field centered near W4, we selected a sampl…
Multiple Stellar Populations of Globular Clusters from Homogeneous Ca-CN-CH Photometry. V. {{cn}}_{JWL}}^{{\prime} } as a Surrogate cn JWL Index and NGC 6723
Lee, Jae-Woo
We introduce new color indices {{cn}}JWL}{\prime } (=Ca CTIO - Ca JWL) and ch JWL [=(JWL43 - b) - (b - y)], accurate photometric measures of the CN band at λ3883 and the CH G band, respectively, in the study of the multiple populations (MPs) in globular clusters (GCs). Our photometric CN-CH re…
Elemental Abundance Distributions in the (R, V ϕ ) Plane with LAMOST DR5 and Gaia DR2
Zhao, Gang; Chen, Yuqin; Zhao, Jingkun +4 more
Since Gaia DR2 was released, many velocity structures in the disk have been revealed, such as large-scale ridge-like patterns in phase space. Both kinematic information and stellar elemental abundances are needed to reveal their evolution history. We have used labels from the APOGEE survey to predict elemental abundances for a huge amount of low-r…
A Cepheid-based Distance to the Seyfert Galaxy NGC 6814
Peterson, Bradley M.; Ferrarese, Laura; Onken, Christopher A. +2 more
We present a Cepheid-based distance to the nearby Seyfert galaxy NGC 6814 from Hubble Space Telescope observations. We obtained F555W and F814W imaging over the course of 12 visits with logarithmic time spacing in 2013 August-October. We detected and made photometric measurements for 16,469 unique sources across all images in both filters, from wh…
COS Observations of the Cosmic Web: A Search for the Cooler Components of a Hot, X-Ray Identified Filament
Zahedy, Fakhri S.; Chen, Hsiao-Wen; Mulchaey, John S. +3 more
In the local universe, a large fraction of the baryon content is believed to exist as diffuse gas in filaments. While this gas is directly observable in X-ray emission around clusters of galaxies, it is primarily studied through its UV absorption. Recently, X-ray observations of large-scale filaments connecting to the cosmic web around the nearby …