269 citations · 728 across the 18 of their papers we have counts for
10 papers · 1 filter
CoBiToM project. III. Physical characterisation of the potential merger candidates AL Lep, ASAS J082243+1927.0, and ZZ PsA
Sofia Palafouta, Kosmas D. Gazeas, Pasi Hakala +3
Contact binaries (CBs) are key systems for investigating the late evolutionary stages that may lead to stellar coalescence. Systems with an extremely low mass ratio and high fill-o…
Circular polarimetry of suspect wind-accreting pre-polars II
Pasi Hakala, Steven Parsons, Gavin Ramsay +2
The origin of white dwarf magnetic fields is an open question. Furthermore, such fields play a vital role in the evolution of interacting binary stars. Here we present a study of w…
ASASSN-14dx: A cataclysmic variable harbouring a massive pulsating white dwarf
Pasi Hakala, Ingrid Pelisoli, Boris T. Gaensicke +5
We present the results of our study of ASASSN-14dx, a previously known but poorly characterised cataclysmic variable (CV). The source was observed as part of an ongoing high-time-r…
Discovery of two new polars evolved past the period bounce
Tim Cunningham, Ilaria Caiazzo, Gracjan Sienkiewicz +13
We report the discovery of two new magnetic cataclysmic variables with brown dwarf companions and long orbital periods ( and min). This discovery incr…
Characterising high and low accretion states in VY Scl CVs using ZTF and TESS data
C. Duffy, Kinwah Wu, G. Ramsay +4
VY Scl binaries are a sub-class of cataclysmic variable (CV) which show extended low states, but do not show outbursts which are seen in other classes of CV. To better determine ho…
Searching for stellar cycles on low mass stars using TESS data
Gavin Ramsay, Pasi Hakala, J. Gerry Doyle
We have searched for stellar activity cycles in late low mass M dwarfs (M0--M6) located in the TESS north and south continuous viewing zones using data from sectors 1--61 (Cycle 1…
Discovery, observations and modelling of a new eclipsing polar: MASTER OT J061451.70-272535.5
H. Breytenbach, D. A. H. Buckley, P. Hakala +9
We report the discovery of a new eclipsing polar, MASTER OT J061451.70-272535.5, detected as an optical transient by MASTER auto-detection software at the recently commissioned MAS…
High-resolution optical spectroscopy of RS Ophiuchi during 2008 -- 2009
A. Somero, P. Hakala, G. A. Wynn
RS Ophiuchi is a symbiotic variable and a recurrent nova. We have monitored it with the Nordic Optical Telescope and obtained 30 high resolution (R=46 000) optical spectra over one…
An AO-assisted variability study of four globular clusters
R. Salinas, R. Contreras Ramos, J. Strader +4
The image subtraction technique applied to study variable stars in globular clusters represented a leap in the number of new detections, with the drawback that many of these new li…
SDSS unveils a population of intrinsically faint cataclysmic variables at the minimum orbital period
B. T. Gaensicke, M. Dillon, J. Southworth +15
We discuss the properties of 137 cataclysmic variables (CVs) which are included in the Sloan Digital Sky Survey (SDSS) spectroscopic data base, and for which accurate orbital perio…