ASTR 3007 - STELLAR PULSATION COMPONENT P e ter W o o d Research School of Astronomy & Astrophysics TOPICS COVERED · Main types of variable stars · Linear adiabatic pulsation theory => periods of pulsation · Linear non-adiabatic pulsation theory => stability - will a star pulsate? ... Here we see Cepheids and long-period variables (LPVs) (movies from Hartman: http://cfa-www.harvard.edu/%7Ejhartman/) WHY STUDY VARIABLE STARS? ... What could cause the pulsation period to vary from star to star? ...

... Printed in U.S.A. THE STELLAR DISK THICKNESS OF LOW SURFACE BRIGHTNESS GALAXIES D. Bizyaev 1,2,3 and S. Kajsin 4 Received 2003 October 23; accepted 2004 June 9 ABSTRACT We present surface photometry results for a sample of 11 edge-on galaxies observed with the 6 m telescope at the Special Astrophysical Observatory, Russia. ... We find from a comparison of photometric scales that the stellar disks of LSB galaxies are thinner than those of high surface brightness ( HSB) galaxies. ... UGC 11301 .. ...