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We have obtained 48 high resolution echelle spectra of the pre-main sequenceeclipsing binary system KH~15D (V582 Mon, P = 48.37 d, $e$ $\sim$ 0.6, M$_{A}$= 0.6 M$_{\odot}$, M$_{B}$ = 0.7 M$_{\odot}$). The eclipses are caused by acircumbinary disk seen nearly edge on, which at the epoch of these observationscompletely obscured the orbit of star B and a large portion of the orbit ofstar A. The spectra were obtained over five contiguous observing seasons from2001/2002 to 2005/2006 while star A was fully visible, fully occulted, andduring several ingress and egress events. The H$\alpha$ line profile showsdramatic changes in these time series data over timescales ranging from days toyears. A fraction of the variations are due to "edge effects" and depend onlyon the height of star A above or below the razor sharp edge of the occultingdisk. Other observed variations depend on the orbital phase: the H$\alpha$emission line profile changes from an inverse P Cygni type profile duringingress to an enhanced double-peaked profile, with both a blue and red emissioncomponent, during egress. Each of these interpreted variations are complicatedby the fact that there is also a chaotic, irregular component present in theseprofiles. We find that the complex data set can be largely understood in thecontext of accretion onto the stars from a circumbinary disk with gas flows aspredicted by the models of eccentric T Tauri binaries put forward by Artymowicz& Lubow, G\"{u}nther & Kley, and de Val-Borro et al. In particular, our dataprovide strong support for the pulsed accretion phenomenon, in which enhancedaccretion occurs during and after perihelion passage.

astrophysical journal/the astrophysical journal

Complex Variability of the H$\alpha$ Emission Line Profile of the T  Tauri Binary System KH 15D: The Influence of Orbital Phase, Occultation by  the Circumbinary Disk, and Accretion Phenomenae