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24 papers · 2 filters
SDSS J074511.56+194926.5: Discovery of a Metal-Rich and Tidally Distorted Extremely Low Mass White Dwarf
A. Gianninas, J. J. Hermes, Warren R. Brown +5
We present the discovery of an unusual, tidally-distorted extremely low mass white dwarf (WD) with nearly solar metallicity. Radial velocity measurements confirm that this is a com…
Constraints on Massive Star Formation: Cygnus OB2 was always an Association
Nicholas J. Wright, Richard J. Parker, Simon P. Goodwin +1
We examine substructure and mass segregation in the massive OB association Cygnus OB2 to better understand its initial conditions. Using a well understood Chandra X-ray selected sa…
Resolved Spectroscopy of the T8.5 and Y0-0.5 Binary WISEPC J121756.91+162640.2AB
S. K. Leggett, Michael C. Liu, Trent J. Dupuy +3
We present 0.9 - 2.5 um resolved spectra for the ultracool binary WISEPC J121756.91+162640.2AB. The system consists of a pair of brown dwarfs that straddles the currently defined T…
SDO/AIA Observations of a Partially Erupting Prominence
Durgesh Tripathi, Katharine K. Reeves, Sarah E. Gibson +2
We report an observation of a partially erupting prominence and associated dynamical plasma processes based on observations recorded by the Atmospheric Imaging Assembly (AIA) on bo…
A new class of pulsating white dwarf of extremely low mass: the fourth and fifth members
J. J. Hermes, M. H. Montgomery, A. Gianninas +7
We report the discovery of two new pulsating extremely low-mass (ELM) white dwarfs (WDs), SDSS J161431.28+191219.4 (hereafter J1614) and SDSS J222859.93+362359.6 (hereafter J2228).…
What is the difference? Blazhko and non-Blazhko RRab stars and the special case of V123 in M3
J. Jurcsik, P. Smitola, G. Hajdu +10
In an extended photometric campaign of RR Lyrae variables of the globular cluster M3, an aberrant light-curve, non-Blazhko RRab star, V123, was detected. Based on its brightness, c…