Results 21 to 30 of about 3,650 (127)

CCD-PHOTOMETRY OF CATACLYSMIC VARIABLE ES DRA IN 2001

Odessa Astronomical Publications, 2017
On the base of our 34-day photometry of ES Dra we found its ∼ 20 d light variations with amplitude of 1m.6 and suggest this star could belong to the nova-like subclass of cataclysmic variable stars.
A. V. Baklanov, E. P. Pavlenko, O. I. Dudka   +2 more
doaj   +1 more source

PHOTOMETRY OF VARIABLE STARS FROM THE THU-NAOC TRANSIENT SURVEY. I. THE FIRST TWO YEARS [PDF]

, 2015
In this paper, we report the detections of stellar variabilities from the first two years of observations of a sky area of about 1300 square degrees from the Tsinghua University–NAOC Transient Survey.
X. Yao, Lingzhi Wang, Xiaofeng Wang, Tianmeng Zhang, Juncheng Chen, W. Yuan, J. Mo, Wenxiong Li, Zhiping Jin, Xue-Bing Wu, J. Nie, Xu Zhou   +11 more
semanticscholar   +1 more source

Follow-up Ground-based Observations of the Dwarf Nova KZ Gem [PDF]

Astrophysical Journal, 2020
We present spectroscopy of stars in the immediate vicinity of the dwarf nova (DN) KZ Gem to confirm its identification, which is ambiguous in the literature.
Zhibin Dai, P. Szkody, J. Thorstensen, N. Medagangoda   +3 more
semanticscholar   +1 more source

Spectroscopy and orbital periods of four cataclysmic variable stars [PDF]

, 2001
We present spectroscopy and orbital periods Porb of four relatively little-studied cataclysmic variable stars. The stars and their periods are: AF Cam, Porb=0.324(1) d (the daily cycle count is slightly ambiguous); V2069 Cyg (= RX J2123.7+4217), 0.311683(
J. Thorstensen, C. Taylor
semanticscholar   +1 more source

Variable stars towards the bulge of M 31: The AGAPE catalogue [PDF]

, 2004
We present the AGAPE astrometric and photometric catalogue of 1579 variable stars in a 14'x10' field centred on M31. This work is the first survey devoted to variable stars in the bulge of M31.
R. Ansari, M. Aurière, P. Baillon, A. Bouquet, G. Coupinot, C. Coutures, C. Ghesquière, Y. Giraud-Héraud, D. Gillieron, P. Gondolo, J. Hecquet, J. Kaplan, A. Kim, Y. L. Du, A. Melchior, M. Moniez, J. Picat, G. S. LAL-Orsay, LATTOMP-Tarbes, Cern, P. France, Ceadapniaspp, U. Utah, LATTOMP-Toulouse, LBL-Berkeley, LERMA-Paris   +25 more
semanticscholar   +1 more source

"INTER-LONGITUDE ASTRONOMY" (ILA) PROJECT: CURRENT HIGHLIGHTS AND PERSPECTIVES. I. MAGNETIC VS. NON-MAGNETIC INTERACTING BINARY STARS

Odessa Astronomical Publications, 2010
We present a review of highlights of our photometric and photo-polarimetric monitoring and mathematical modeling of interacting binary stars of different types classical, asynchronous, intermedi ate polars with 25 timescales corresponding to differ ent ...
I. L. Andronov, K. A. Antoniuk, A. V. Baklanov, V. V. Breus, V. Burwitz, L. L. Chinarova, D. Chochol, P. A. Dubovsky, W. Han, T. Hegedus, A. Henden, L. Hric, Chun-Hwey Kim, Yonggi Kim, S. V. Kolesnikov, I. Kudzej, A. Liakos, P. G. Niarchos, A. Oksanen, L. Patkos, K. Petrik, N. V. Pit', N. M. Shakhovskoy, N. A. Virnina, J. Yoon, S. Zola   +25 more
doaj   +1 more source

Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis [PDF]

Astronomy & Astrophysics, 2018
A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB.
G. Luna, K. Mukai, J. Sokoloski, T. Nelson, P. Kuin, A. Segreto, G. Cusumano, M. J. Arancibia, N. Nuñez   +8 more
semanticscholar   +1 more source

Erupting Cataclysmic Variable Stars in the Nearest Globular Cluster, NGC 6397: Intermediate Polars? [PDF]

, 2005
NGC 6397 is the closest globular cluster and hence the ideal place to search for faint stellar populations such as cataclysmic variables (CVs). Hubble Space Telescope (HST) and Chandra observers have identified nine certain and likely CVs in this nearby ...
M. Shara, S. Hinkley, D. Zurek, C. Knigge, Andrea Dieball Department of Astrophysics, Amnh, Usa, U. Southampton, Uk   +8 more
semanticscholar   +1 more source

An Optical Study of Two VY Sculptoris-type Cataclysmic Binary Stars: V704 And and RX J2338+431 [PDF]

Astronomical Journal, 2018
We report observations of the known cataclysmic variable star (CV) V704 And, and also confirm that the optical counterpart of the ROSAT Galactic Plane Survey source RX J2338+431 is a heretofore-neglected CV.
K. Weil, J. Thorstensen, F. Haberl
semanticscholar   +1 more source

The AH Pictoris Syndrome: Continuous Trains of Stunted Outbursts in Novalike Variables

The Astrophysical Journal
Novalike variables are a subgroup of cataclysmic variables (CVs) that—unlike dwarf novae—do not exhibit strong brightenings in their long-term light curves.
Albert Bruch
doaj   +1 more source