2005IAUC.8591....2R -
IAU Circ., 8591, 2 (2005/August-0)
Variable star near M27.
RENZ W., HANISCH J., LINDBERG H.-G., BOYD D., WAAGEN E., QUINN N., RODRIGUEZ D., McGAHA J.E., HENDEN A., VANMUNSTER T. and MARTIN B.
Abstract (from CDS):
W. Renz, Karlsruhe, Germany, reports the CCD discovery of a variable star situated in the outer portion of M27 by J. Hanisch (Gescher, Germany) on unfiltered CCD images taken on about Aug. 18.0 UT (at mag about 15.8; position R.A. = 19h59m51s.29, Decl. = +22o42'32".3, equinox 2000.0) and independently by H.-G. Lindberg (Skultuna, Sweden) on an image taken on Aug. 18.9. Renz also forwards position end figures 51s.283, 32".13 obtained by D. Boyd (Oxfordshire, U.K., 0.35-m reflector) from CCD frames taken on Aug. 21.92. CCD magnitudes for the variable star (reported in part by E. Waagen, AAVSO): Aug. 16.937, 15.6 (N. Quinn, West Sussex, U.K.; prediscovery; unfiltered); 21.916, V = 16.17 (Boyd); 21.917, I = 16.00 (Boyd); 21.935, V = 16.69 (D. Rodriguez, Madrid, Spain); 22.998, V = 16.16 (Boyd); 22.997, I_c = 15.82 (Boyd); 26.194-26.202, R = 15.6 (J. E. McGaha, Tucson, AZ); 27.241, V = 15.6 (McGaha); 27.245, R = 15.8 (McGaha); 27.249, B = 14.9 (McGaha). A. Henden, AAVSO, writes that a likely progenitor with R_c about 22.5 has been identified on co-added U.S. Naval Observatory images of M27 taken in the early 1990s (limiting mag R_c about 26, but a difficult measurement with the variable background and nearby brighter stars) – giving an amplitude of about 7 magnitudes, typical for a WZ-Sge- type cataclysmic variable. Renz and Henden add that 'superhump' variations in brightness of about 0.3 mag with a period of about 82 min have been detected in photometric observations by T. Vanmunster and B. Martin.
Abstract Copyright:
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Journal keyword(s):
Nomenclature:
[RHL2005] J195951.29+224232.3 N=1.
Simbad objects:
2
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