Essays about: "period-luminosity relation"
Found 3 essays containing the words period-luminosity relation.
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1. Comparing the Period-Luminosityrelationships in variable stars
University essay from Uppsala universitet/Institutionen för fysik och astronomiAbstract : There are four Period Luminosity relations from three sources, [3, 5, 9, 11], that are compared for theiraccuracy in calculating distances and to see how much uncertainty has to be considered when calculatingother distances based on these. Here, the relations are compared by using each to calculate and compare thedistances of the stars: BK Vir, L2 Pup, R Hor, R Hya, R Lep, and RR Aql; along with using data from AAVSOand SIMBAD in the calculations. READ MORE
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2. A kinematic check of the distance scale of Galactic Cepheids
University essay from Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation; Lunds universitet/Astronomi - Genomgår omorganisationAbstract : A selection of well known period luminosity relations for cepheid variables are studied under the assumption that cepheid variables have a mean vertical velocity of zero in the galactic plane. Proper motion data from Hipparcos and Thyco-2 catalogues are coupled with the distances obtained from applying the period luminosity relations on a database of known classical cepheids to calculate the velocities of the cepheids. READ MORE
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3. Astrophysical validation of Gaia parallaxes
University essay from Lunds universitet/Astronomi - Genomgår omorganisationAbstract : The Gaia satellite, to be launched in August 2012, will measure highly accurate absolute parallaxes of hundreds of millions of stars. This is done by comparing parallactic displacement of stars in different parts of the sky. READ MORE
