Thurl, ChristineSackett, PennyHauschildt, Peter H2015-12-070004-6361http://hdl.handle.net/1885/18334Context. We present work on Hα spectral line characteristics in PHOENIX stellar model atmospheres and their comparison to microlensing observations. Aims. We examine in detail the Ha equivalent width (EW) and the line shape characteristics for effectiveKeywords: Absorption; Parameter estimation; Thermodynamics; Chromospheric emission; Gravitational lensing; Stars: atmospheres; Thermodynamic equilibrium (LTE); Astronomy Gravitational lensing; Stars: atmospheres200610.1051/0004-6361:200547662015-12-07