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CCD Photometry Results on Some Hipparcos Stars
Walker, Gary
This paper summarizes the status of the AAVSO CCD Photometry Program through May of 1994. The findings of the CCD questionnaire covering such topics as types of equipment, software, filters, and cameras are discussed. The first six months' observations are discussed and compared to visual observations, and the AAVSO CCD Photometry Program is evalu…
Calibration of Hipparcos Long Period Variable Start Fields Using Multi-Color CCD Observations
Howell, Steve B.; Mattei, Janet; Benson, Priscilla J. +1 more
The first set of 4-color AAVSO CCD finder charts has been prepared using the 0.9-m telescope at Kitt peak national Observatory in Arizona. The stars selected were northern long period variable stars observed with the Hipparcos astrometric satellite, since multicolor photometry was needed on these stars to calibrate and reduce the photometric and a…
Searching for the White Dwarf in Dwarf Novae
Mattei, Janet A.; Nelan, Edmund; Holm, Albert V. +1 more
AAVSO observations of dwarf novae were used to select targets in a search by the International Ultraviolet Explorer (IUE) satellite for their white dwarf components. Twelve of fourteen attempts caught the dwarf novae in quiescence. Lyman alpha absorption such as seen in white dwarf stars was found in three of the six observed systems, two of which…
Meeting Reports: Colloquium on HIPPARCOS Scientific Aspects of the Input Catalogue Preparation and A Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite
Mattei, Janet A.
The colloquium HIPPARCOS Scientific Aspects of Input Catalogue Preparation, held in Sitges, Spain, January 25 - 29, 1988, is described. Also described is a celebratory symposiun on a Decade of UV Astronomy with the IUE Satellite, held April 12 - 15,k 1988 in Greenbelt, MD. Brief description of the European astrometric satellite HIPPARCOS and the u…