Section: PZ: main journal
8001 magnitude measurements in the B, V, and I_c filters were acquired for the high-amplitude delta Scuti variable V2455 Cyg. The observations and light curves are presented.
1665 magnitude measurements in the B, V, g', and r' filters were acquired for the double-mode Cepheid AS Cas. The light curves for both fundamental and first-overtone modes were constructed.
USNO-B1.0 0992-0344981, a New Double-mode Type-II Cepheid
I present a detection of a new double-mode type~II Cepheid (BL Her type), USNO-B1.0 0992-0344981, pulsating in the fundamental and first-overtone modes. It is the fifth case in the Galaxy of stars of this type. For the analysis, I used all observations available for the star in the ASAS-SN, ASAS-3, NSVS, and ZTF online public archives. Light elements and parameters of the light curves were obtained.
Variability of GSC 08977-08895 and GSC 07418-01521
I present a study of two variable stars, GSC 08977-08895 and GSC 07418-01521. This study is a part of our search for double-mode and multi-mode periodicity of variables. GSC 08977-08895 shows variability of a Doubly Eclipsing System, type ELL+EA. GSC 07418-01521 is a high-amplitude double-mode Delta Scuti variable, pulsating in the fundamental and first overtone modes, with an eclipsing component, type HADS(B)+EA. Our photometric study of both stars is based mainly on ASAS-SN data. Additionally, for the first star, we used ASAS-3 data, for the second star, we used 1SWASP and SSS data. The light elements of all periodic variations of both variables and the parameters of their light curves were obtained.
Observations of high-amplitude optical transients AT2020ray and AT2020ugj discovered by MASTER robotic net
We report photometry of two optical transients, MASTER OT J224524.92+211742.0 = AT2020ray and MASTER OT J213908.79+161240.2 = 2020ugj. Additionally, a spectrum of AT2020ray was obtained with the Russian 6-meter telescope, BTA. Both transients were classified as WZ Sge-type cataclysmic variables in superoutbursts. The superoutburst of AT2020ray was accompanied by multiple type B rebrightenings. In the bright state, both objects had strong UV excess.
We introduce a correction to the recent 83rd Name-list of Variable Stars.
We present our detection of 6 new Classical Cepheids and a photometric study of 7 known Classical Cepheids. We used all observations available for these stars in the ASAS-SN, 1SWASP, ASAS-3, and NSVS online public archives, our photographic estimates (for 6 stars) and our CCD observations (for 2 stars). We analyzed all data using the period-search software developed by Dr. V.P. Goranskij for Windows environment. Light elements and parameters of the light curves were obtained.
We present 3965 magnitude measurements in the B, V, and I_c filters acquired for the RR Lyrae star SU Hor. The star shows Blazhko effect.
We present a new Name-List of variable stars containing information on 1385 variable stars in globular star clusters (constellations Bootes - Lupus; 26 clusters in 16 constellations) that now get their names in the system of the General Catalogue of Variable Stars (GCVS). Also, GCVS names are assigned to four recent Novae in our Galaxy. A correction to Part II of the 82nd Name-list of variable stars is announced.
BVIcg'r' CCD Observations of Three Classical Cepheids in NGC 7790
We present 2728 magnitude measurements in the B, V, Ic, g', and r' filters acquired for three classical Cepheids in the open cluster NGC 7790: CEa Cas, CEb Cas, and CF Cas. Reliable separate PSF-photometry of the components of CE Cas was obtained for the first time.