Periodic Halpha Emission in the Eclipsing Binary VV Cephei
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.
- Publication:
-
Information Bulletin on Variable Stars
- Pub Date:
- July 2018
- DOI:
- 10.22444/IBVS.6249
- Bibcode:
- 2018IBVS.6249....1P