Section: PZ: main journal
Photometric elements and stellar parameters for the contact binary RZ UMi
The contact binary RZ UMi was discovered by Goranskij (1982), who also attributed it to the W UMa class with a period of 0.33735283 days. No other observations of this star have been published since. We therefore re-observed RZ UMi at Beersel Hills Observatory on nine nights between May 2001 and March 2003. The instrument used was a 0.4 m Newtonian telescope, equipped first with a SBIG ST7E CCD camera (2001-2002) and later with a ST10 XME camera (2003). The 2001 observations are unfiltered. From 2002 onwards, a V filter according to the specifications of Bessell (1995) was used. The exposure times varied between 120 and 180 seconds. All images were reduced with the aperture photometry procedure of the Mira AP software package and darkframed and flatfielded according to standard procedures.
Our BVR CCD photometric study of the globular cluster NGC 7006 permitted us to find two new suspected RR Lyrae variables. A cluster chart is presented with the position of known and suspected variables marked.
Classifications and light elements, based on data mining in the ASAS-3 and ROTSE-I/NSVS data, are presented for 100 variable stars, 78 of them from the NSV catalog. Availability of online observations makes it possible to suggest all these stars for GCVS Name-Lists.
We report discovery and investigation of missed supernova 1985 on Moscow archive plates.