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VV Cephei emission lines continue to fade

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#1 old_frankland

old_frankland

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Posted 19 November 2017 - 06:14 PM

Had and opportunity to collect spectra of eclipsing binary VV Cephei a couple nights ago.  As Hugh Allen has been reporting, H-alpha and H-beta emission peaks continue to decline with ingress of the Be star and its accretion disk.  My spectra now show little evidence of H-beta.  It will be interesting to see how much longer H-alpha will be detectable with low resolution spectrograph.  The first graph compares the relative intensity of Ha and Hb recorded 09 Sep and 18 Nov.  Interesting thing is, the eclipse of the Be star by the M star can only be reliably recorded with spectroscopy, even more exciting, it can be done with the most modest of equipment from a light polluted suburban backyard.  Spectroscopy rocks!!

 

vvcep_spec_jferreira_sep-nov-2017_001.pn

 

vvcep_h-alpha_spec_sep-oct-nov_101.png

 

 

vvcep_h-beta_spec_sep-oct-nov_101.png


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