Observation by john simpson: Spectropolarimetry - VV Cep

Uploaded by

john simpson

Observer

john simpson

Observed

2019 Jan 28 - 02:30

Uploaded

2019 Jan 30 - 10:40

Objects

VV-Cep
Spectrum

Equipment

Celestron C8
Star Analyser
WollastonPrism
ATIK Titan

Location

SW Scotland

Target name

VV CEP

Title

Spectropolarimetry - VV Cep

About this image

Another attempt at spectropolarimetry, this time with VV Cep which I've been monitoring so far only with broadband filters. Convolving the spectra with synthetic V-Band in ISIS yields a linear polarisation of 1.35% and angle 39.6 degrees. Measurements from 1 week before using V-Band filter gave 1.5% and 37.6 degrees respectively so reasonably close. Below 4500 Angstrom the measurements are suspect. Although the Wollaston separates the spectral orders, some caution needed above 7500 Angstrom also. Yet another part success only.

Files associated with this observation

vvcep-polarisation-summary.jpg (314.7 kB)

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David Basey, Andy Wilson, Peter Carson

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