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Ordinary Meeting: "From Spectrosopic Binaries to Exoplanets"

Friday 19 October 2012 - 8:00pm
Topic: From Spectroscopic Binaries to Exoplanets
Speaker: Andrew James, ASNSW
Venue: Epping Creative Centre - 26 Stanley Road, Epping
Abstract: Spectroscopic Binaries (SBs) are a special kind of close unresolved double star system that is mostly visually inseparable, being only revealed by careful observations of a stellar spectrum of days to several years. About 2000 systems like this are currently known, though the general quality of the southern systems is not as well established. Observations of stellar spectra show it can either be as two different sets of spectral lines or one solitary spectrum that slowly oscillates overtime. Multiple measurements of these observed differences are converted to velocities relative to the observer (Doppler shifts), which are then plotted to reveal its velocity curve. By mathematical manipulation, we can derive most of the orbital parameters of such binary systems.
This talk will discusses the history of spectroscopic binaries, papers and catalogues of them, and the slow but vital developments or improvements in the increased precision with modern astronomical spectroscopy. Highlighted will be some of the general methods employed to derive orbits and components astrophysical parameters.
We will also focus on examples of a number of bright southern systems adding some additional concepts of more recent knowledge. This talk concludes with just a brief discussion of new and useful avenues of astronomical spectroscopy that applies to the observation on discovery of exoplanets.
Biography: Andrew James is long term ASNSW member and a past president of ASNSW.

Event Date: 
Friday, 19 October, 2012 - 20:00
Epping Creative Centre, 26 Stanley Road, Epping NSW

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