High Resolution Spectroscopy of KH 15D During Its Bright Phase and the Possible Analogue HMW 15

Details High Resolution Spectroscopy of KH 15D During Its Bright Phase and the Possible Analogue HMW 15 High Resolution Spectroscopy of KH 15D During Its Bright Phase and the Possible Analogue HMW 15

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..353h&link_type=abstract

NOAO Proposal ID #2006B-0353

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Scientific paper

KH 15D is a unique and important stellar system comprising two pre- main sequence solar-like stars in a highly eccentric (e=0.57) orbit with a period of 48.37 days. The system is surrounded by an opaque, sharp- edged precessing elliptical, disk (or ring) that is inclined by about 20 degrees to the plane of the binary orbit. The disk currently occults the full orbit of one component and part of the orbit of the other, leading to very deep, sharp and predictable eclipses. High resolution spectroscopy obtained with Keck I/HIRES and VLT/UVES during ingress, egress and mid-eclipse have been obtained. Interpretation of these data requires spectral information obtained out of eclipse; we need to separate phase-dependent spectral variations from time-dependent ones. We propose to continue our campaign to obtain high resolution, high S/N spectra of KH 15D during 15 nights of out-of-eclipse phases in one of the two possible windows in semester 2006B with HET/HRS. The data will allow us to assess the intrinsic variability of the spectral features, particularly H(alpha), providing a valuable baseline for interpreting the Keck and VLT spectra. This is very possibly the last year that the star will be bright enough to observe with HET. The possible analogue system HMW 15 will be observed to search for binarity.

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