Periodic Halpha Emission in the Eclipsing Binary VV Cephei

POLLMANN, E. and BENNETT, P. D. and VOLLMANN, W. and SOMOGYI, P. (2018) Periodic Halpha Emission in the Eclipsing Binary VV Cephei. Information Bulletin on Variable Stars, 63 (6249). ISSN 1587-2440

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Abstract

We present a high-cadence time series of spectroscopic observations of the H emission line profile obtained during the egress and total eclipse phases of the M supergiant binary VV Cephei (M2 Iab + B0-2 V) for the 2017-2018 eclipse. Medium-resolution spectroscopy, obtained at an almost nightly cadence by the ARAS Spectroscopy Group from April 2017 through June 2018, has been used to construct a time-series of equivalent widths (EWs) of the H emission line flux. The peak fluxes of the blue (V) component and the red (R) component relative to the continuum, as well as their ratio, V/R, have also been found. We report on a new 43.5-day periodic variation in the H emission that is present throughout the entire time series and, in particular, persists through mid-eclipse.

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