Search Publications
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIV. Differences in Internal Kinematics of Multiple Stellar Populations
Brown, Thomas M.; Milone, Antonino P.; Vesperini, Enrico +12 more
Our understanding of the kinematic properties of multiple stellar populations (mPOPs) in Galactic globular clusters (GCs) is still limited compared to what we know about their chemical and photometric characteristics. Such limitation arises from the lack of a comprehensive observational investigation of this topic. Here we present the first homoge…
A Type II Radio Burst Driven by a Blowout Jet on the Sun
Tian, Hui; Madjarska, Maria S.; Deng, Yuanyong +5 more
Type II radio bursts are often associated with coronal shocks that are typically driven by coronal mass ejections (CMEs) from the Sun. Here we conduct a case study of a type II radio burst that is associated with a C4.5-class flare and a blowout jet, but without the presence of a CME. The blowout jet is observed near the solar disk center in the e…
Carbon Stars as Standard Candles: An Empirical Test for the Reddening, Metallicity, and Age Sensitivity of the J-region Asymptotic Giant Branch (JAGB) Method
Lee, Abigail J.
The J-region Asymptotic Giant Branch (JAGB) method is a standard candle based on the intrinsic luminosities of carbon stars in the near-infrared. We directly constrain the impact of metallicity, age, and reddening on the JAGB method. We assess how the mode, skew, and spread of the JAGB star LF change throughout diverse stellar environments in M31'…
Gamma Cas Stars as Be+White Dwarf Binary Systems
Gies, Douglas R.; Wang, Luqian; Klement, Robert
The origin of the bright and hard X-ray emission flux among the γ Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) companion. Such Be+WD binaries are the predicted outcome of a second stage of mass transfer from a helium star mass donor to a rapidly rotating mass gainer star. The stripped …
The Green Bank North Celestial Cap Survey. VII. 12 New Pulsar Timing Solutions
Ransom, S. M.; Kaplan, D. L.; McLaughlin, M. A. +22 more
We present timing solutions for 12 pulsars discovered in the Green Bank North Celestial Cap 350 MHz pulsar survey, including six millisecond pulsars (MSPs), a double neutron star (DNS) system, and a pulsar orbiting a massive white dwarf companion. Timing solutions presented here include 350 and 820 MHz Green Bank Telescope data from initial confir…
CECILIA: The Faint Emission Line Spectrum of z 2-3 Star-forming Galaxies
Maseda, Michael V.; Steidel, Charles C.; Law, David R. +7 more
We present the first results from Chemical Evolution Constrained Using Ionized Lines in Interstellar Aurorae (CECILIA), a Cycle 1 JWST NIRSpec/MSA program that uses ultra-deep ~30 hr G235M/F170LP observations to target multiple electron temperature-sensitive auroral lines in the spectra of 33 galaxies at z ~ 1-3. Using a subset of 23 galaxies, we …
X-Ray Detection of the Galaxy's Missing Baryons in the Circumgalactic Medium of L* Galaxies
Bianchi, S.; Piconcelli, E.; Nicastro, Fabrizio +10 more
The number of baryons hosted in the disks of galaxies is lower than expected based on the mass of their dark matter halos and the fraction of baryon-to-total matter in the Universe, giving rise to the so-called galaxy missing-baryon problem. The presence of cool circumgalactic matter gravitationally bound to its galaxy's halo up to distances of at…
A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 au New Horizons-LORRI Data
Cooray, Asantha; Zemcov, Michael; Symons, Teresa +2 more
Direct photometric measurements of the cosmic optical background (COB) provide an important point of comparison to both other measurement methodologies and models of cosmic structure formation, and permit a cosmic consistency test with the potential to reveal additional diffuse sources of emission. The COB has been challenging to measure from Eart…
Magnetic Activity Evolution of Solar-like Stars. I. S ph-Age Relation Derived from Kepler Observations
van Saders, Jennifer; García, Rafael A.; Breton, Sylvain N. +9 more
The ages of solar-like stars have been at the center of many studies such as exoplanet characterization or Galactic-archeology. While ages are usually computed from stellar evolution models, relations linking ages to other stellar properties, such as rotation and magnetic activity, have been investigated. With the large catalog of 55,232 rotation …
A New Study on a Type Iax Stellar Remnant and its Probable Association with SN 1181
Hillier, D. John; Parker, Quentin A.; Ritter, Andreas +4 more
We report observations and modeling of the stellar remnant and presumed double-degenerate merger of Type Iax supernova Pa 30, which is the probable remnant of SN 1181 AD. It is the only known bound stellar SN remnant and the only star with Wolf-Rayet features that is neither a planetary nebula central star nor a massive Population I progenitor. We…