Observation by Graham Beamson: VV Cephei. V and R Bands vs Time.

Uploaded by

Graham Beamson

Observer

Graham Beamson

Observed

2026 Sep 10 - 14:17

Uploaded

2026 Sep 10 - 14:21

Objects

VV-Cep
Spectrum

Equipment

SW Esprit 120
StarEx spectrograph
SW EQ6-R mount

Location

Cheshire UK

Target name

VV Cephei. V and R Bands vs Time.

Title

VV Cephei. V and R Bands vs Time.

About this image

VV Cephei is a binary star consisting of an M type supergiant and a B type main sequence star. A strong stellar wind from the M type star is captured by the B type to form an accretion disk. The H alpha spectrum of VV Cephei shows an H alpha emission line, with V and R components, from the accretion disc superimposed on the continuum, with absorption lines, from the M type star. This is a plot of the height of the V (green dots) and R (red dots) bands, normalized to the height of the continuum, vs time. There is an ~45 day period thought to be due to nutation of the B star.

Files associated with this observation

VV-Cephei-V&R-height-vs-time.jpg (123.4 kB)

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