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A SPECTROSCOPIC SURVEY AND ANALYSIS OF BRIGHT, HYDROGEN-RICH WHITE DWARFS*
- A. Gianninas, P. Bergeron, M. Ru'iz
- Physics
- 14 September 2011
We have conducted a spectroscopic survey of over 1300 bright (V ≤ 17.5), hydrogen-rich white dwarfs based largely on the last published version of the McCook & Sion catalog. The complete results from… Expand
An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
- P. Tremblay, P. Bergeron, A. Gianninas
- Physics
- 1 February 2011
We present an improved spectroscopic and photometric analysis of hydrogen-line DA white dwarfs from the Sloan Digital Sky Survey Data Release 4 (SDSS DR4) based on model atmospheres that include… Expand
The ELM Survey. VII. Orbital Properties of Low Mass White Dwarf Binaries
- Warren R. Brown, A. Gianninas, M. Kilic, S. Kenyon, C. Prieto
- Physics
- 14 April 2016
We present the discovery of 15 extremely low mass (5 < log{g} < 7) white dwarf candidates, 9 of which are in ultra-compact double-degenerate binaries. Our targeted ELM Survey sample now includes 76… Expand
The ELM Survey. V. Merging Massive White Dwarf Binaries
- Warren R. Brown, M. Kilic, +4 authors Iac
- Physics
- 15 April 2013
We present the discovery of 17 low mass white dwarfs (WDs) in short-period P ≤ 1 day binaries. Our sample includes four objects with remarkable logg ≃ 5 surface gravities and orbital solutions that… Expand
A new class of pulsating white dwarf of extremely low mass: The fourth and fifth members
- J. Hermes, M. Montgomery, +7 authors B. G. Castanheira
- Physics
- 30 September 2013
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). Both WDs have… Expand
DISCOVERY OF A COOL, MASSIVE, AND METAL-RICH DAZ WHITE DWARF
- A. Gianninas, P. Dufour, P. Bergeron
- Physics
- 28 October 2004
We report the discovery of a new metal-rich DAZ white dwarf, GD 362. High signal-to-noise ratio optical spectroscopy reveals the presence of spectral lines from hydrogen as well as Ca I, Ca II, Mg I,… Expand
Limb-darkening Coefficients for Eclipsing White Dwarfs
- A. Gianninas, B. Strickland, M. Kilic, P. Bergeron
- Physics
- 29 January 2013
We present extensive calculations of linear and nonlinear limb-darkening coefficients as well as complete intensity profiles appropriate for modeling the light-curves of eclipsing white dwarfs. We… Expand
Spectroscopic Analysis of Hot, Hydrogen-rich White Dwarfs: The Presence of Metals and the Balmer-line Problem
- A. Gianninas, A. Gianninas, P. Bergeron, J. Dupuis, M. T. Ruiz, M. T. Ruiz
- Physics
- 12 August 2010
We present an analysis of optical spectra for 29 DAO white dwarfs. First, we present our new up-to-date model atmosphere grids computed without the assumption of local thermodynamic equilibrium in… Expand
Most Double Degenerate Low Mass White Dwarf Binaries Merge
- Warren R. Brown, M. Kilic, S. Kenyon, A. Gianninas
- Physics
- 14 April 2016
We estimate the merger rate of double degenerate binaries containing extremely low mass (ELM) <0.3 Msun white dwarfs in the Galaxy. Such white dwarfs are detectable for timescales of 0.1 Gyr -- 1 Gyr… Expand
Discovery of pulsations, including possible pressure modes, in two new extremely low mass, He-core white dwarfs
- J. Hermes, M. Montgomery, +6 authors S. Harrold
- Physics
- 5 November 2012
We report the discovery of the second and third pulsating extremely low mass white dwarfs (WDs), SDSS J111215.82+111745.0 (hereafter J1112) and SDSS J151826.68+065813.2 (hereafter J1518). Both have… Expand