Greg Bolt
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View article: The asynchronous polar V1432 Aquilae and its path back to synchronism
The asynchronous polar V1432 Aquilae and its path back to synchronism Open
V1432 Aquilae is the only known eclipsing asynchronous polar. In this respect it is unique and therefore merits our attention. We report the results of a 15-year campaign by the globally distributed Center for Backyard Astrophysics to obse…
View article: The Rise and Fall of the King: The Correlation between FO Aquarii's Low States and the White Dwarf's Spindown
The Rise and Fall of the King: The Correlation between FO Aquarii's Low States and the White Dwarf's Spindown Open
The intermediate polar FO Aquarii (FO Aqr) experienced its first-reported low-accretion states in 2016, 2017, and 2018, and using newly available photographic plates, we identify pre-discovery low states in 1965, 1966, and 1974. The primar…
View article: OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk Open
We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was d…
View article: The Spin-period History of Intermediate Polars
The Spin-period History of Intermediate Polars Open
We report the detailed history of spin-period changes in five intermediate polars (DQ Herculis, AO Piscium, FO Aquarii, V1223 Sagittarii, and BG Canis Minoris) during the 30–60 yr since their original discovery. Most are slowly spinning up…
View article: QZ Carinae Orbit of the Two Binary Pairs
QZ Carinae Orbit of the Two Binary Pairs Open
We present an updated O-C diagram of the light-time variations of the eclipsing binary (component B) in the system QZ Carinae as it moves in the long-period orbit around the non-eclipsing pair (component A). This includes new Variable Star…
View article: Survey of period variations of superhumps in SU UMa-type dwarf novae. X. The tenth year (2017)
Survey of period variations of superhumps in SU UMa-type dwarf novae. X. The tenth year (2017) Open
Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 102 SU UMa-type dwarf novae observed mainly during the 2017 season, and characterized these objects. WZ Sge-type stars ident…
View article: EXTENSIVE PHOTOMETRY OF V1838 AQL DURING THE 2013 SUPEROUTBURST
EXTENSIVE PHOTOMETRY OF V1838 AQL DURING THE 2013 SUPEROUTBURST Open
We present an in-depth photometric study of the 2013 superoutburst of the recently discovered cataclysmic variable V1838 Aql and subsequent photometry near its quiescent state. A careful examination of the development of the superhumps is …
View article: Lower atmosphere and pressure evolution on Pluto from ground-based stellar occultations, 1988–2016
Lower atmosphere and pressure evolution on Pluto from ground-based stellar occultations, 1988–2016 Open
Context. The tenuous nitrogen (N 2 ) atmosphere on Pluto undergoes strong seasonal effects due to high obliquity and orbital eccentricity, and has recently (July 2015) been observed by the New Horizons spacecraft. Aims. The main goals of t…
View article: Extensive Photometry of V1838 Aql during the 2013 Superoutburst
Extensive Photometry of V1838 Aql during the 2013 Superoutburst Open
We present an in-depth photometric study of the 2013 superoutburst of the recently discovered cataclysmic variable V1838 Aql and subsequent photometry near its quiescent state. A careful examination of the development of the superhumps is …
View article: Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. The ninth year (2016–2017)
Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. The ninth year (2016–2017) Open
Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 127 SU UMa-type dwarf novae observed mainly during the 2016–2017 season and characterized these objects. We provide updated …
View article: Resynchronization of the Asynchronous Polar CD Ind
Resynchronization of the Asynchronous Polar CD Ind Open
CD Ind is one of only four confirmed asynchronous polars (APs). APs are\nstrongly magnetic cataclysmic variables of the AM Herculis subclass with the\ncharacteristic that their white dwarfs rotate a few per cent out of synchronism\nwith th…
View article: T Pyxidis: death by a thousand novae
T Pyxidis: death by a thousand novae Open
We report a 20-year campaign to track the 1.8 hour photometric wave in the recurrent nova T Pyxidis, using the global telescope network of the Center for Backyard Astrophysics. During 1996-2011, that wave was highly stable in amplitude and…
View article: Verifying timestamps of occultation observation systems
Verifying timestamps of occultation observation systems Open
We describe an image timestamp verification system to determine the exposure timing characteristics and continuity of images made by an imaging camera and recorder, with reference to Coordinated Universal Time (UTC). The original use was t…
View article: Verifying Timestamps of Occultation Observation Systems
Verifying Timestamps of Occultation Observation Systems Open
We describe an image timestamp verification system to determine the exposure timing characteristics and continuity of images made by an imaging camera and recorder, with reference to Coordinated Universal Time. The original use was to veri…