Amelia Wehlau Professor Emerita P&AB 210 Department of Physics and Astronomy University of Western Ontario London, ON, Canada N6A 3K7 Phone: (519) 679-2111 ext. 6710 Fax: (519) 661-2033 Email: afwehlau@astro.uwo.ca

My Current Research Interests

Studies of variable stars in advanced stages of stellar evolution, determining various observational parameters such as periods of pulsation, period changes, amplitudes, colours, magnitudes, and chemical composition. Using stellar evolution theory this data is used to investigate the origin and evolution of old stellar systems such as globular clusters and galaxies in which these stars are found.

Below are a finding chart and light curves for variable V9 in the globular cluster NGC 5897 which is about 40,000 light years distant from the sun. Variable V9 is an SX Phe star, a type of main sequence pulsating star. The blue and visual (yellow) magnitudes indicate a rise and fall in brightness of more than 2 times every 1.2 hours.

Recent Publications

Wehlau, A., Slawson, R.W. & Nemec, J.M., 1999, Two-Color CCD Photometry of Variable Stars in
NGC 7006, The Astronomical Journal, 117, 286

Wehlau, A., Slawson, R., Nemec, J.M., Butterworth, S., 1995, RR Lyrae Variables in NGC 7006 in
"Astrophysical Applications of Stellar Pulsation", IAU Coll. 155, eds. R.S. Stobie & P.A. Whitelock,
ASP Conference Series 83, 391

Wehlau, W. & Wehlau, A., 1995, Light Variability of 28 Aql in "Astrophysical Applicatons of Stellar
Pulsation", IAU Coll. 155, eds. R.S. Stobie & P.A. Whitelock, ASP Conference Series 83, 323

Wehlau, A., Froelich, N., 1994, The Variables of M14, AJ 108, 134

Wehlau, A., Nemec, J.M., Hanlan, P., Rich, R.M., 1991, Period Change Rates for 46 RR Lyrae Stars in
NGC 7006, AJ 103, 1583, 1716

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Last modified: 30 July 1999