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Investigating the break in the Cepheid period-luminosity relation and its implications
Cepheid variable stars Cycle luminosity Linear time. universal
2014/12/9
The Cepheid period-luminosity (PL) relation is a major component in the distance scale ladder. This relation has been considered to be linear (within period ranges of ～2 to ～100 days) and universal (i...
Discovery of the neutron star spin and orbital period from the Be/X-ray binary IGR J05414-6858 in the LMC
Discovery neutron star spin orbital the Be/X-ray binary IGR J05414-6858 the LMC
2012/2/22
The number of known Be/X-ray binaries in the Large Magellanic Cloud is small compared to the observed population of the Galaxy or the Small Magellanic Cloud. The discovery of a system in outburst prov...
Distinguishing between a true period and its alias, and other tasks of model discrimination
Distinguishing alias model discrimination data analysis statistical surveys
2012/2/21
We consider the task of distinguishing between two different alternative models that can roughly equally explain observed time series data, mainly focusing on the period ambiguity case (aliasing). We ...
A Bayesian Approach to Calibrating Period-Luminosity Relations of RR Lyrae Stars in the Mid-Infrared
statistical methods RR Lyrae distance scale
2012/2/17
A Bayesian approach to calibrating period-luminosity (PL) relations has substantial benefits over generic least-squares fits. In particular, the Bayesian approach takes into account the full prior dis...
Rapidly Rotating Lenses: Repeating features in the lightcurves of short period binary microlenses
gravitational lensing: micro – celestial mechanics – binaries: general –planetary systems – Galaxy: bulge
2011/9/16
Microlensing is most sensitive to binary lenses with relatively large orbital separations, and as such, typical binary microlensing events show little or no orbital motion during the event. However, d...
The Orbital Period and Variability of the Dwarf Nova ES Draconis
stars: individual: ES Dra (PG 1524+622) – novae: cataclysmic variables – binaries: spectroscopic – AAVSO
2011/7/21
A radial velocity study of the cataclysmic variable ES Dra (PG 1524+622) is presented. ES Dra is found to have an orbital period of 0.17660 \pm 0.00006 d (4.2384 \pm 0.0014 h). The mass-losing seconda...
The Optical Gravitational Lensing Experiment. Dwarf Novae in the OGLE Data. I. Three New Dwarf Novae: One in the Period Gap and Two Longer Period Objects
novae, cataclysmic variables – binaries: close – surveys
2011/7/12
We report serendipitous discovery of three new dwarf novae which eruptions in 2010 were observed by the ongoing microlensing survey OGLE-IV. All three objects are located in the Galactic bulge fields ...
A 12 minute Orbital Period Detached White Dwarf Eclipsing Binary
Orbital Period Detached Dwarf Eclipsing Binary
2011/7/12
We have discovered a detached pair of white dwarfs (WDs) with a 12.75 min orbital period and a 1,315 km/s radial velocity amplitude. We measure the full orbital parameters of the system using its ligh...
A natural formation scenario for misaligned and short-period eccentric extrasolar planets
open clusters and associations: general — planets and satellites: for- mation — planetary systems: protoplanetary disks — planetary systems: planet-disc interactions — planetary systems: planet-star interactions — physical data: hydrodynamics
2011/7/11
Recent discoveries of strongly misaligned transiting exoplanets pose a challenge to the established planet formation theory which assumes planetary systems to form and evolve in isolation. However, th...
The short-period low-mass binary system CC Com revis
stars binaries:close stars:individual (CC Com) stars:low-mass stars:evolution
2011/7/1
In this study we determined precise orbital and physical parameters of the very short period low-mass contact binary system CC Com. The parameters are obtained by analysis of the new CCD data with the...
Period Change Similarities among the RR Lyrae Variables in Oosterhoff I and Oosterhoff II Globular Systems
Period Change Similarities among RR Lyrae Variables
2010/11/30
We present period change rates (dP/dt) for 42 RR Lyrae variables in the globular cluster IC$\,$4499. Despite clear evidence of these period increases or decreases, the observed period change rates are...
Orbital Period Determinations for Four SMC Be/X-ray Binaries
Orbital Period Determinations SMC Be/X-ray Binaries
2010/11/30
We present an optical and X-ray study of four Be/X-ray binaries located in the Small Magellanic Cloud (SMC). OGLE I-band data of up to 11 years of semi-continuous monitoring has been analysed for SMC ...
The Banana Project. III. Spin-orbit Alignment in the Long-period Eclipsing Binary NY Cephei
techniques spectroscopic|stars kinematics and dynamics|stars early-type stars rotation|stars formation
2010/11/1
Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here we...
Whole Earth Telescope Observations of the subdwarf B star KPD 1930+2752: A rich, short period pulsator in a close binary
stars general — oscillations individual(KPD1930+2752)
2010/11/1
KPD 1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellip-soidal variable with a known binary period just over two hours. The companion is most likely a white dwarf and the ...
Long-term photometric monitoring of Messier 5 variables: I. Period changes of RR Lyrae stars
Solar and Stellar Astrophysics (astro-ph.SR)
2010/10/5
The period changes of 86 M5 RR Lyrae stars have been investigated on a one-hundred-year time base. The published observations have been supplemented by archival Asiago, Konkoly and Las Campanas photog...