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The occurrence of Binary Evolution Pulsators in the classical instability strip of RR Lyrae and Cepheid variables
P. Karczmarek, G. Wiktorowicz, K. Iłkiewicz +5
Single star evolution does not allow extremely low-mass stars to cross the classical instability strip (IS) during the Hubble time. However, within binary evolution framework low-m…
The Surface Brightness--Color Relations Based on Eclipsing Binary Stars: Toward Precision Better than 1% in Angular Diameter Predictions
Dariusz Graczyk, Piotr Konorski, Grzegorz Pietrzynski +7
In this study we investigate the calibration of surface brightness--color (SBC) relations based solely on eclipsing binary stars. We selected a sample of 35 detached eclipsing bina…
VEGA/CHARA interferometric observations of Cepheids. I. A resolved structure around the prototype classical Cepheid delta Cep in the visible spectral range
N. Nardetto, A. Mérand, D. Mourard +23
The B-W method is used to determine the distance of Cepheids and consists in combining the angular size variations of the star, as derived from infrared surface-brightness relation…
A solar twin in the eclipsing binary LL Aqr
D. Graczyk, R. Smolec, K. Pavlovski +11
In the course of a project to study eclipsing binary stars in vinicity of the Sun, we found that the cooler component of LL Aqr is a solar twin candidate. This is the first known s…
Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity
Fabio Bresolin, Rolf-Peter Kudritzki, Miguel A. Urbaneja +3
We present spectra of 14 A-type supergiants in the metal-rich spiral galaxy M83. We derive stellar parameters and metallicities, and measure a spectroscopic distance modulus m-M =…
A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
Rolf Kudritzki, Miguel Urbaneja, Norberto Castro +5
Low resolution (4.5 to 5 Angstroem) spectra of 58 blue supergiant stars distributed over the disk of the Magellanic spiral galaxy NGC 55 in the Sculptor group are analyzed by means…
Multiplicity of Galactic Cepheids from long-baseline interferometry~III. Sub-percent limits on the relative brightness of a close companion of ~Cephei
A. Gallenne, A. Merand, P. Kervella +11
We report new CHARA/MIRC interferometric observations of the Cepheid archetype Cep, which aimed at detecting the newly discovered spectroscopic companion. We reached a maximum…
Orbital and physical parameters, and the distance of the eclipsing binary system OGLE-LMC-ECL-25658 in the Large Magellanic Cloud
S. S. Elgueta, D. Graczyk, W. Gieren +11
We present an analysis of a new detached eclipsing binary, OGLE-LMC-ECL-25658, in the Large Magellanic Cloud. The system consists of two late G-type giant stars on an eccentric orb…
The OGLE-III planet detection efficiency from six years of microlensing observations (2003 to 2008)
Y. Tsapras, M. Hundertmark, Ł. Wyrzykowski +17
We use six years (2003 to 2008) of Optical Gravitational Lensing Experiment III microlensing observations to derive the survey detection efficiency for a range of planetary masses…
Multi-Mode and Non-Standard Classical Cepheids in the Magellanic System
I. Soszynski, A. Udalski, M. K. Szymanski +10
We present a sample of the most interesting classical Cepheids selected from the OGLE collection of classical Cepheids in the Magellanic System. The main selection criterion for th…
The OGLE Collection of Variable Stars. Classical Cepheids in the Magellanic System
I. Soszynski, A. Udalski, M. K. Szymanski +10
We present here a nearly complete census of classical Cepheids in the Magellanic System. The sample extends the set of Cepheids published in the past by the Optical Gravitational L…
Eclipsing Binaries with Classical Cepheid Component in the Magellanic System
A. Udalski, I. Soszyński, M. K. Szymański +10
We present a census of eclipsing binary systems with classical Cepheid as a component. All such systems known were found in the OGLE collection of classical Cepheids in the Magella…