ST Chamaeleontis and BP Coronae Australis: Two Southern Dwarf Novae Confirmed as Z Cam Stars
Volume 42 number 1 (2014)
- Mike Simonsen
- AAVSO, 49 Bay State Road, Cambridge, MA 02139; mikesimonsen@aavso.org
- Terry Bohlsen
- Mirranook Observatory, Booroolong Road, Armidale, NSW, Australia; terry.bohlsen@bigpond.com
- Franz-Josef Hambsch
- Oude Bleken 12, Mol, 2400, Belgium; hambsch@telenet.be
- Rod Stubbings
- 2643 Warragul—Korumburra Road, Tetoora Road, Vic, Australia; stubbo@sympac.com.au
Abstract
Z Camelopardalis (Z Cam) stars are a subset of dwarf novae distinguished by the occurrence of "standstills" -- periods of relative constant brightness one to one and a half magnitudes fainter than maximum brightness. As part of an ongoing observing campaign, the Z CamPaign, the authors focused attention on several Z Cam suspects in the southern hemisphere. Two stars, BP CrA and ST Cha were found to exhibit standstill behavior in 2013, thus confirming them as Z Cam type systems. This adds two more bona fide members to the nineteen confirmed Z Cams, bringing the total to twenty-one.