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Discovery Of Pulsations, Including Possible Pressure Modes, In Two New Extremely Low Mass, He-Core White Dwarfs

Hermes, J. J.; Montgomery, Michael H.; Winget, D. E.; Brown, Warren R.; Gianninas, A.; Kilic, Mukremin; Kenyon, S. J.; Bell, Keaton J.; Harrold, Samuel T. (2013-03)

We report the discovery of the second and third pulsating extremely low mass (ELM) white dwarfs (WDs), SDSS J111215.82+111745.0 (hereafter J1112) and SDSS J151826.68+065813.2 (hereafter J1518). Both have masses < 0.25 ...