Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492481
Title: Variable stars as distance indicators in M31.
Author: Todd, I. G.
Awarding Body: Queens University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2008
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Abstract:
The distance scale in the universe is of key importance. To detennine the distance to objects far out in the universe, reliable distance indicators, or standard candles must be found and reliably characterised. This study focussed on the detection of cepheids and eclipsing binaries in the Andromeda Galaxy (M31) using the relatively new method of Difference Imaging Analysis (DIA), deemed to yield better results in crowded fields. Many eclipsing binaries and cepheids were found. Due the lack of spectroscopy, the calculation of distance using EBs was not possible, however accurate locations and periods for around 130 was secured for future work. The V-band Period luminosity relationship for M31 was calculated and found to agree with that of other authors, however poor determination of absolute photometry hampered efforts to perfonn investigations of other features ofthe relationship. The 1- band and Wesenheit W-band relationship were also detennined. The effects of blending on eclipsing binary and cepheid lightcurves was also Supplied by The British Library - 'The world's knowledge' investigated, and found to be significant is such a crowded field.
Supervisor: Not available Sponsor: Not available
Qualification Name: Queens University Belfast, 2008 Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.492481  DOI: Not available
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