Peremennye Zvezdy

Publications

Section: PZ: main journal

Другое Unusual Short-period Cepheid with a Prominent Bump
PZ, vol. 37, N 1 (8.06.2017) | D. Denisenko / IKI

I report my discovery of a peculiar short-period Type II Cepheid in Centaurus. The new variable is pulsating with the period of 2.918 days, yet it is showing a distinctly double-peaked light curve with two nearly equal maxima. The "bumps" are normally observed in long-period Cepheids with periods ranging from 6 to 16 days, but there are exceptions for stars with shorter P values. The new variable resides in the halo, more than 3 kpc above the Galactic plane, and belongs to population II Cepheids of the BL Her type (CWB).


Другое Cataclysmic and RCB Type Candidates for Identification of Three Suspected Variables
PZ, vol. 36, N 2 (23.12.2016) | E. V. Kazarovets

I report the discovery of two cataclismic variable stars as probable candidates for identification of the Luyten's variable HV 9251 (NSV 10231) and Wolfs' object AN 115.1905 (NSV 12542). I also suggest the possible RCB variability type for Hoffmeister's star S 9384 (NSV 11988).


Другое MASTER OT J190519.41+301524.4: A New Eclipsing Cataclysmic Variable of the VY Scl Type
PZ, vol. 36, N 1 (18.11.2016) | F. Martinelli, D. Denisenko

MASTER OT J190519.41+301524.4 was discovered as a 15m.7 optical transient by the Mobile Astronomical System of TElescope-Robots (MASTER) in March, 2014. We report the results of photometric observations of this variable performed at the Lajatico Astronomical Center in June - July, 2015. The light curve shows deep V-shaped eclipses with an amplitude of two magnitudes. The orbital period was determined to be 0d.129694 (3h.113). Based on the archival observations and the shape of the orbital curve, we suggest that MASTER OT J190519.41+301524.4 is a new cataclysmic variable of VY Scl type ("anti-nova"), with an inclination angle close to 90 degrees.


Другое New RRC variables with an additional non-radial pulsation
PZ, vol. 35, N 5 (11.12.2015) | A. V. Khruslov / Tula, Russia

We present a new study of 14 known RR Lyrae variable stars from the Catalina surveys periodic variable star catalog. We analyzed all observations available for these stars in the Catalina Surveys online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to these data, the stars are RRC variables with an additional non-radial pulsation.


Другое New Double-Mode RR Lyrae Variables III
PZ, vol. 35, N 4 (24.09.2015) | A. V. Khruslov / Tula, Russia

We present a new study of 123 known RR Lyrae variable stars from the Catalina surveys periodic variable star catalog. We analyzed all observations available for these stars in the Catalina Surveys online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to these data, the stars are double-mode RR Lyrae variables, pulsating in the first-overtone and fundamental modes.


Другое Novae and Nova-like Stars in the 81th Name-list of Variable Stars: Official Announcement of GCVS Names
PZ, vol. 35, N 3 (15.07.2015) | E. V. Kazarovets, N. N. Samus

GCVS names are announced for 13 galactic variable stars of rare types (mostly Novae) discovered in 2013-2015.


Другое A Photometric Study of the Double-Mode High-Amplitude Delta Scuti Variable Star QS Draconis
PZ, vol. 35, N 2 (12.03.2015) | A. V. Khruslov, A. V. Kusakin

We present the results of our new observations of QS Draconis, a recently discovered double-mode high-amplitude Delta Scuti variable, HADS(B) type. We analyzed our CCD BVR photometry for this star, improved the frequencies f0 and f1 and pulsation amplitudes, detected the interaction frequencies f1+f0, f1-f0, 2f0, and f1+2f0.


Другое New Double-Mode RR Lyrae Variables II
PZ, vol. 35, N 1 (16.02.2015) | A. V. Khruslov / Tula, Russia

We present a new study of 56 known RR Lyrae variable stars from the Catalina surveys periodic variable star catalog. We analyzed all observations available for these stars in the Catalina Surveys and SuperWASP online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to these data, the stars are double-mode RR Lyrae variables, pulsating in the first-overtone and fundamental modes.


Другое Explosion of an LBV star in the galaxy UGC 8246
PZ, vol. 34, N 4 (10.12.2014) | E. A. Barsukova, V. Goranskij, A. Valeev, S. Kaisin

We present the results of spectroscopy and CCD photometry of the intermediate-luminosity red transient PSN J13100734+3410514 in the galaxy UGC 8246 performed in February and June 2014 with the Russian 6-meter telescope and SCORPIO spectral camera. Our CCD photometry was continued with the Special Astrophysical Observatory's 1-m telescope till November 2014. The star was discovered in late December 2013 at visual brightness 17.6m, which corresponded to the absolute magnitude MV = -12.7m, and was identified as a supernova impostor. Spectra taken at the visual brightness level of 19.5m show composite triple profiles in the Halpha and Hbeta emission lines. We explain the main component of the profiles as radiation from a photoionized extensive gaseous envelope formed by the stellar wind of the progenitor before the outburst. The other two components are treated as radiation from bipolar ejecta. In Balmer line profiles, there is an evidence for a light echo propagating in the surrounding medium after the outburst. Our spectra contain emissions of He I, Na I, Mg I, numerous Fe II emissions, the strongest of which have P Cyg profiles. There are also [O II], [O III], and [S II] emissions of an H II region associated with the transient. The emissions of the region are superimposed on the star spectrum. The light curves show rapid decline and color reddening. Our observations confirm that the UGC 8246 transient was an explosion of a high-mass LBV star.


Другое New Double-Mode RR Lyrae Variables
PZ, vol. 34, N 3 (14.11.2014) | A. V. Khruslov / Tula, Russia

We present a new study of 28 known RR Lyrae variable stars. We analyzed all observations available for these stars in the Catalina Surveys, LINEAR, Northern Sky Variability Survey, and SuperWASP online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to these data, the stars are double-mode RR Lyrae variables, pulsating in the first-overtone and fundamental modes.


1 | 2 | 3 | 4 | 5 | 6 | 7 | Next

Main Page | Search
Astronet | SAI | INASAN

Report problems