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HST Fine Guidance Sensor Astrometric Parallaxes for Three Dwarf Novae: SS Aurigae, SS Cygni, and U Geminorum

Thomas E. Harrison·Bernard J. McNamara·Paula Szkody·Barbara J. McAurthur·G. F. Benedict·Arnold R. Klemola·Ronald L. Gilliland
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Abstract

We report astrometric parallaxes for three well known dwarf novae obtained using the Fine Guidance Sensors on the Hubble Space Telescope. We found a parallax for SS Aurigae of Pi = 5.00 +/- 0.64 mas, for SS Cygni we found Pi = 6.02 +/- 0.46 mas, and for U Geminorum we obtained Pi = 10.37 +/- 0.50 mas. These represent the first true trigonometric parallaxes of any dwarf novae. We briefly compare these results with previous distance estimates. This program demonstrates that with a very modest amount of HST observing time, the Fine Guidance Sensors can deliver parallaxes of unrivaled precision.

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Thomas E. Harrison, Bernard J. McNamara, Paula Szkody, Barbara J. McAurthur, G. F. Benedict, Arnold R. Klemola, Ronald L. Gilliland. 1999-02-16. HST Fine Guidance Sensor Astrometric Parallaxes for Three Dwarf Novae: SS Aurigae, SS Cygni, and U Geminorum. https://doi.org/10.1086/311982

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