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13 papers · 1 filter
Flaring Stars in a Non-targeted mm-wave Survey with SPT-3G
C. Tandoi, S. Guns, A. Foster +96
We present a flare star catalog from four years of non-targeted millimeter-wave survey data from the South Pole Telescope (SPT). The data were taken with the SPT-3G camera and cove…
Double Mode Cepheids from the Zwicky Transient Facility Survey
Vishwangi Shah, Xiaodian Chen, Richard de Grijs
Multi-mode Cepheids pulsate simultaneously in more than one mode of oscillation. They provide an independent means to test stellar models and pulsation theories. They can also be u…
Schwarzschild and Ledoux are equivalent on evolutionary timescales
Evan H. Anders, Adam S. Jermyn, Daniel Lecoanet +4
Stellar evolution models calculate convective boundaries using either the Schwarzschild or Ledoux criterion, but confusion remains regarding which criterion to use. Here we present…
Cooling Delays from Iron Sedimentation and Iron Inner Cores in White Dwarfs
M. E. Caplan, I. F. Freeman, C. J. Horowitz +2
Do white dwarfs have inner cores made of iron? Neutron rich nuclei like Fe experience a net gravitational force and sediment toward the core. Using new phase diagrams and mo…
The Loudest Stellar Heartbeat: Characterizing the most extreme amplitude heartbeat star system
T. Jayasinghe, C. S. Kochanek, J. Strader +16
We characterize the extreme heartbeat star system MACHO 80.7443.1718 in the LMC using TESS photometry and spectroscopic observations from the Magellan Inamori Kyocera Echelle (MIKE…
Neon Cluster Formation and Phase Separation During White Dwarf Cooling
M. E. Caplan, C. J. Horowitz, A. Cumming
Recent observations of Galactic white dwarfs (WDs) with Gaia suggest there is a population of massive crystallizing WDs exhibiting anomalous cooling -- the Q branch. While single-p…