Section: PZ: main journal
Long-Term Photometric and Spectral Variations of DI Cephei
We have analyzed the photometric and spectral variations of the classical T Tauri star DI Cep for the last 50 years. Currently the star is at its faintest state and possesses an emission spectrum in the visual range. Synchronous spectroscopy and UBVR photometry show that the higher the brightness, the stronger were the intensities of hydrogen Halpha, Hbeta emission lines and of FeII, HeI 5876 A emissions. For the first time, we detected, with a high probability, quasi-periodic variations of the star's brightness and of its spectrum with the period P = 2020 +/- 200 days.
I present the discovery of a pulsating component in light variations of the known eclipsing binary NSV 10993 based on the NSVS and ASAS-3 publicly available data.
Photometric Observations of Two Type II-P Supernovae: Normal SN II-P 2004A and Unusual SN 2004ek
CCD BVRI photometry is presented for type II Supernovae 2004A and 2004ek. SN 2004A is found to be a typical SN II-P, with the shape of the light and color curves and maximum luminosity closely matching those for SN 1999em. SN 2004ek shows unusual light curves with long flat plateau in the B band, two peaks in the V band and prominent brightening in the R and I bands, starting about 45 days past outburst. The brightness decline after the plateau stage is probably quite slow. The plateau luminosity is about 1.5 mag higher than average for SNe II-P.
Multi-night CCD observations of the previously unknown variable GSC 02805–00766 reveal its nature as a contact binary. We present its light elements and light curve.
The Recent Period Evolution of the RRc stars HY Com, RU Psc and AP Ser
The first overtone RR Lyrae stars HY Com, RU Psc and AP Ser have shown frequent sudden period changes in recent years, as calculated from NSVS and ASAS-3 data.
We present the discovery, photographic and V-band CCD observation of a new High Amplitude Delta Scuti star USNO-A2.0 0975-09853705.
The details for a serendipitously discovered R Coronae Borealis (RCB) variable are given.
New GCVS Versions for Three Southern Constellations
We are currently working on a version of the General Catalogue of Variable Stars (GCVS) revised taking into account the new data accumulated since the 4th GCVS edition. A draft new version will be released for each constellation as soon as the work for the constellation is finished. It will contain all stars of the 4th GCVS edition plus a complete catalogue of the stars added to the GCVS in the Name Lists of Variable Stars Nos. 67 - 78. Now we are ready for the first release, containing more than 1300 variable stars in the constellations of Antlia, Ara, and Telescopium. When preparing the release, we actively used modern data-mining possibilities to improve variability types and light elements. This paper introduces the first release of the new GCVS version and presents new results (types, light elements), based mainly on data mining, for 213 stars.
CCD VRI photometry is presented for SN 2002hh from 14 days after the outburst till day 347. SN 2002hh appears to be a normal IIP supernova regarding both luminosity and the shape of the light curve, which is similar to SN 1999gi.
Archival Photographic Light Curves of the Red Semiregular Star CPD -80 966 [1964 - 1976], and Modern CCD Multicolor Photometry
We used digitised scans of plates from the Bamberg Observatory Southern Photographic Patrol Survey to study the variation of the recently discovered semiregular variable star CPD -80 966 from 1964 to 1976. We present evidence to show that the star was varying during the course of the Bamberg survey, but was apparently overlooked at the time. We also present multicolour CCD photometry of CPD -80 966 from 2006 July to 2007 March.