May Meeting – “Astronomical Spectroscopy”
Our speaker this month is Jack Martin, who will be talking about “Astronomical Spectroscopy”.
Spectroscopy is a method used to analyse light by spreading it into its component colour wavelengths and studying the resulting pattern (as spectrum). Astronomical spectroscopy is the study of the spectrum of light from astronomical objects like stars, nebulae and galaxies. Use of spectroscopy has proven vital to our understanding of the universe and has enabled astronomers to infer many physical and chemical properties of objects.
Spectroscopy can be used to derive many properties of distant stars and galaxies, such as: chemical composition, temperature, mass, distance and relative motion (you’ve likely heard of the term “redshift”).
With modern cameras, a simple filter and computer software, spectroscopy can now be carried out fairly simply and inexpensively by amateur astronomers.
Jack Martin, author of the book “A Spectroscopic Atlas of Bright Stars”, will give an introduction to the concepts of spectroscopy and show examples of stellar spectra and what they mean.
The public meeting takes place at the Henry Dixon Hall, Rivenhall End on Wednesday 15th May at 7:30pm. For further information, see the Events page.