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We present optical and X-ray observations of two tidally distorted, extremely low-mass white dwarfs (WDs) with massive companions. There is no evidence of neutron stars in our Chandra and XMM observations of these objects. SDSS…

Non-thermal variable emission from radio to very-high energy gamma rays (VHE; >100 GeV) are the prime characteristics of gamma-ray binaries. The underlying physical processes leading to the observed VHE emission are not well understood, as…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Gernot Maier

The first eclipsing binary pulsar, PSR B1957+20, was discovered in 1987. Since then, 13 other eclipsing low-mass binary pulsars have been found, 12 of these are in globular clusters. In this paper we list the known eclipsing binary pulsars…

Astrophysics · Physics 2016-08-30 Paulo C. C. Freire

V501 Her is a well detached G3 eclipsing binary star with a period of 8.597687 days for which we have determined very accurate light and radial-velocity curves by using robotic telescopes. Results of these data indicate that the component…

Solar and Stellar Astrophysics · Physics 2015-06-22 Claud H. Sandberg Lacy , Francis C. Fekel

We present a detailed study of KIC 2306740, an eccentric double-lined eclipsing binary system. Kepler satellite data were combined with spectroscopic data obtained with the 4.2 m William Herschel Telescope (WHT). This allowed us to…

Solar and Stellar Astrophysics · Physics 2021-04-14 D. Koçak , K. Yakut , J. Southworth , P. P. Eggleton , T. İçli , C. A. Tout , S. Bloemen

In this paper, we present the results of a comprehensive study of six eclipsing binaries whose components are confirmed or suspected Am stars. By combining long-term high-resolution CAOS spectroscopy and TESS photometry we have been able to…

Solar and Stellar Astrophysics · Physics 2024-02-27 G. Catanzaro , A. Frasca , J. Alonso-Santiago , C. Colombo

We identify 231 objects in the newly released Cycle 0 dataset from the Kepler Mission as double-eclipse, detached eclipsing binary systems with Teff < 5500 K and orbital periods shorter than ~32 days. We model each light curve using the…

Solar and Stellar Astrophysics · Physics 2015-05-19 J. L. Coughlin , M. Lopez-Morales , T. E. Harrison , N. Ule , D. I. Hoffman

Eclipsing binaries offer a unique opportunity to determine basic stellar properties. With the advent of wide-field camera and all-sky time-domain surveys, thousands of eclipsing binaries have been charted via light curve classification, yet…

Solar and Stellar Astrophysics · Physics 2017-03-08 Chien-Hsiu Lee

HS0705+6700 (also identified as V470 Cam) is a short period (2.3 h) post common envelope detached eclipsing sdB binary system which exhibits transit time variations (TTVs) of a cyclical nature. We report a further 25 timings of light minima…

Solar and Stellar Astrophysics · Physics 2015-02-25 D. Pulley , G. Faillace , D. Smith , C. Owen

Using Campaign 15 data from the K2 mission, we have discovered a triply-eclipsing triple star system: EPIC 249432662. The inner eclipsing binary system has a period of 8.23 days, with shallow $\sim$3% eclipses. During the entire 80-day…

We have discovered a new, near-equal mass, eclipsing M dwarf binary from the Next Generation Transit Survey. This system is only one of 3 field age ($>$ 1 Gyr), late M dwarf eclipsing binaries known, and has a period of 1.74774 days,…

We present our second catalog of quadruple star candidates, containing 101 systems discovered in TESS Full-Frame Image data. The targets were initially detected as eclipsing binary stars with the help of supervised machine learning methods…

The eclipsing binary system ASAS J174600-2321.3, which has shown a conspicuous brightening of ~4 magnitudes (V) in the past, was recently identified as a symbiotic nova candidate. A long-term photometric monitoring program was initiated in…

Solar and Stellar Astrophysics · Physics 2015-12-07 Franz-Josef Hambsch , Stefan Hümmerich , Klaus Bernhard , Sebastián Otero

We report the discovery of 3 new Double Periodic Variables based on the analysis of ASAS-SN light curves: GSD J11630570-510306, V593 Sco and TYC 6939-678-1. These systems have orbital periods between 10 and 20 days and long cycles between…

Solar and Stellar Astrophysics · Physics 2019-09-05 J. A. Rosales , R. E. Mennickent

The Be/X-ray binary system LS V +44 17 (RX J0440.9+4431) is a potential member of the rare class of gamma-ray binaries. The system is comprised of a Be star and a neutron star companion with an orbital period of 150 days. In December of…

High Energy Astrophysical Phenomena · Physics 2023-08-24 Jamie Holder

We present the orbital and physical parameters of a newly discovered low-mass detached eclipsing binary from the All-Sky Automated Survey (ASAS) database: ASAS J011328-3821.1 A - a member of a visual binary system with the secondary…

$\zeta$ Phoenicis is a bright binary system containing B6V and B8V stars. It has deep total and annular eclipses, a slightly eccentric orbit with a period of 1.669 d, apsidal motion and a third body on a wider orbit. The Transiting…

Solar and Stellar Astrophysics · Physics 2020-12-22 John Southworth

We obtained time-series radial velocity spectroscopy of twenty cataclysmic variable stars, with the aim of determining orbital periods P_orb. All of the stars reported here prove to have P_orb > 3.5 h. For sixteen of the stars, these are…

Solar and Stellar Astrophysics · Physics 2015-05-19 John R. Thorstensen , Christopher S. Peters , Julie N. Skinner

We have discovered a partially eclipsing white dwarf, low-mass M dwarf binary (3 hour 54.41 second orbital period), SDSS J143547.87+373338.5, from May 2007 observations at the WIYN telescope. Here we present blue band photometry of three…

Astrophysics · Physics 2009-11-13 Justin D. R. Steinfadt , Lars Bildsten , Steve B. Howell

We present the results of a photometric survey for variable stars in the nearby globular cluster M5. A 14.8x22.8 arcmin^2 field centered on the cluster was monitored for a total of 37 hours with a CCD camera mounted on the 1.0-m Swope…

Astrophysics · Physics 2007-05-23 J. Kaluzny , I. Thompson , W. Krzeminski , W. Pych
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