Browsing Exact and Earth Sciences by Author "Brown, Warren R."

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    • Discovery of an ultramassive pulsating white dwarf 

      Hermes, James J.; Kepler, Souza Oliveira; Castanheira, Bárbara Garcia; Gianninas, Alexandros; Winget, Donald Earl; Montgomery, Michael Houston; Brown, Warren R.; Harrold, Samuel T. (2013) [Journal article]
      We announce the discovery of themostmassive pulsating hydrogen-atmosphere white dwarf (WD) ever discovered, GD 518. Model atmosphere fits to the optical spectrum of this star show it is a 12,030 ± 210 K WD with a log g = ...

    • The McDonald Observatory search for pulsating sdA stars : asteroseismic support for multiple populations 

      Bell, Keaton; Pelisoli, Ingrid Domingos; Kepler, Souza Oliveira; Brown, Warren R.; Winget, Donald Earl; Winget, K. I.; Vanderbosch, Zachary; Castanheira, Bárbara Garcia; Hermes, James J.; Montgomery, Michael Houston; Koester, Detlev (2018) [Journal article]
      Context. The nature of the recently identified “sdA” spectroscopic class of stars is not well understood. The thousands of known sdAs have H-dominated spectra, spectroscopic surface gravity values between main sequence ...