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High Speed Photometry of AM CVns with the UCT CCD

Published online by Cambridge University Press:  22 February 2018

Patrick A. Woudt  and
Brian Warner
Patrick A. Woudt
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa
Brian Warner
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa

Abstract

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Following our high speed photometric survey of faint cataclysmic variables, two CVs were recognised to be helium-transferring double degenerates; these are ES Cet (Рorb – 620.21144 s) and 2003aw (Psh= 2041.5 s). We have now observed ES Cet photometrically for over two years in order to follow the evolution of the orbital period. We oiler an alternative; explanation for the nature of V407 Vul (which was classified as an ultra-compact together with RX J0806 and ES Cet); this will take V407 Vul out of the AM CVn classification.

Resumen

Resumen

Continuando con nuestro “survey” fotométrico de alta velocidad de variables catacísmicas débiles, se han reconocido dos CVs como dogeneradas dobles que transfieren helio; se trata de ES Cet (Рorb – 620.21144 s) y 2003aw (Psh= 2041.5 s). Hemos observado ES Cet fotométricamente durante más de dos años para seguir la evolución del período orbital. Ofrecemos una explicación alternativa para la naturaleza de V407 Vul (que fue clasificada como una ultracompacta junto con RX J0806 y ES Cet), la cual elimina a V407 Vul de la clasificación AM CVn.

Keywords

BinariesClose — Novae, Cataclysmic Variables — StarsIndividual (ES CET, 2003AW) — TechniquesPhotometric
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 120 - 121
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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