Results 31 to 40 of about 12,301 (190)

The High Angular Resolution Multiplicity of Massive Stars

, 2008
We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago.
Alzner, Alzner, Alzner, Baize, Baize, Baize, Baize, Barnaby, Brendley, Brendley, Brian D. Mason, Clarke, Couteau, Couteau, Couteau, Cvetkovic, Cvetkovic, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Docobo, Douglas R. Gies, ESA, Espin, Fekel, Finsen, Finsen, Finsen, Finsen, Finsen, Finsen, Finsen, Finsen, Forveille, Gies, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Hartkopf, Harvey, Harvin, Heintz, Heintz, Heintz, Heintz, Heintz, Heintz, Heintz, Heintz, Holden, Honig, Hoogerwerf, Horch, Hummel, Hummel, Isobe, Isobe, John W. Helsel, Lane, Leonard, Ling, Ling, Ling, Ling, Mante, Mante, Mante, Mante, Mante, Mante, Mante, Mason, Mason, Mason, Mason, Mason, Mason, Mason, Mason, Maíz-Apellániz, Maíz-Apellániz, Mourao, Muller, Nelan, Niemela, Nys, Olevic, Olevic, Olevic, Olevic, Olevic, Olevic, Olevic, Patience, Penny, Petr, Popovic, Romero, Romero, Romero, Romero, Rossiter, Scardia, Scardia, Scardia, Seymour, Seymour, Seymour, Seymour, Seymour, Simon, Starikova, Starikova, Starikova, Söderhjelm, Tamazian, Todd J. Henry, Tokovinin, Tokovinin, Turner, Turner, van den Bos, Vanbeveren, Walborn, Weigelt, William I. Hartkopf, Zaera, Zirm, Zirm, Zulevic, Zulevic, Öpik   +150 more
core   +1 more source

Visual/infrared interferometry of Orion Trapezium stars: Preliminary dynamical orbit and aperture synthesis imaging of the Theta 1 Orionis C system [PDF]

, 2007
Located in the Orion Trapezium cluster, Theta 1 Orionis C is one of the youngest and nearest high-mass stars (O5-O7) and also known to be a close binary system.
Baize, Bally, Berger, Bernasconi, Bessell, Boden, Bonnell, Claret, D. Schertl, Demircan, Docobo, Donati, Duquennoy, E. Pedretti, F. P. Schloerb, G. Weigelt, Gagne, Gagné, Grosso, Gómez, Hillenbrand, Hillenbrand, Hofmann, Hofmann, J. D. Monnier, J.-P. Berger, Johnson, K. Ohnaka, K.-H. Hofmann, Kenyon, Kervella, Kraus, Köhler, Labeyrie, Levato, Lohmann, Martins, Martins, Mathis, Mathis, Monnier, Monnier, Oudmaijer, Pedretti, Pedretti, Pourbaix, Preibisch, R. Millan-Gabet, Richichi, Rodríguez, S. Kraus, Schaefer, Schertl, Schulz, Siess, Simón-Díaz, Stahl, Stahl, Tamazian, Tan, Th. Preibisch, Traub, Trumpler, van Altena, Vitrichenko, Vitrichenko, W. A. Traub, Wade, Walborn, Weigelt, Weigelt, Weigelt, Y. Y. Balega   +72 more
core   +5 more sources

Differential photometry of speckle-interferometric binary and multiple stars [PDF]

Astronomy & Astrophysics, 2005
A method for differential photometry of speckle-interferometric binary and multiple stars is presented. Both the accuracy and sources of systematic errors of the method are analysed. The photometric accuracy ranges between 0. m 02 and 0. m 20, depending on the atmospheric seeing, the brightness and the separation of the system components.
openaire   +1 more source

Binary Cepheids from optical interferometry

, 2013
Classical Cepheid stars have been considered since more than a century as reliable tools to estimate distances in the universe thanks to their Period-Luminosity (P-L) relationship.
A. Gallenne, A. Mérand, G. Pietrzyński, J. Breitfelder, J.D. Monnier, P. Kervella, W. Gieren   +6 more
core   +1 more source

Wolf-Rayet stars probed by AMBER/VLTI [PDF]

, 2008
Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observations, although evidence of geometrical complexity of their wind are ...
Bonneau, Daniel, Chesneau, Olivier, Dessart, Luc, Driebe, Thomas, Hofmann, Karl-Heinz, Millour, Florentin, Petrov, Romain, Weigelt, Gerd   +7 more
core   +5 more sources

Testing Models of Stellar Evolution for Metal-poor Stars: An Interferometric-spectroscopic Orbit for the Binary HD 195987

The Astronomical Journal, 2002
We report spectroscopic and interferometric observations of the moderately metal-poor double-lined binary system HD 195987, with an orbital period of 57.3 days. By combining our radial-velocity and visibility measurements, we determine the orbital elements and derive absolute masses for the components of MA = 0.844 ± 0.018 M⊙ and MB = 0.6650 ± 0.0079 M⊙
Guillermo Torres, Andrew F. Boden, David W. Latham, Margaret Pan, Robert P. Stefanik   +4 more
openaire   +3 more sources

BINARY STAR ORBITS. IV. ORBITS OF 18 SOUTHERN INTERFEROMETRIC PAIRS

The Astronomical Journal, 2010
First orbits are presented for 3 interferometric pairs and revised solutions for 15 others, based in part on first results from a recently initiated program of speckle interferometric observations of neglected southern binaries. Eight of these systems contain additional components, with multiplicity ranging up to 6.
Brian D. Mason, William I. Hartkopf, Andrei Tokovinin   +2 more
openaire   +1 more source

The Araucaria Project: the Baade–Wesselink projection factor of pulsating stars and interferometric contribution to the eclipsing binaries technique of distance determination [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractThe international Araucaria Project aims to provide an improved local calibration of the extragalactic distance scale out to distances of a few Megaparsecs. We present a brief, up-to-date review of different results and ongoing projects to (i) better understand the Baade–Wesselink projection factor used in distance determinations based on ...
Nicolas Nardetto, Mounir Challouf, Guillaume Guiglion, Denis Mourard, Wolfgang Gieren, Grzegorz Pietrzyński, Dariusz Graczyk   +6 more
openaire   +1 more source

The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138

, 2016
We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds.
Farrington, Chris, Gies, Douglas R., Gordon, Kathryn, Hill, Grant M., Moffat, Anthony F. J., Pablo, Herbert, Ramiaramanantsoa, Tahina, Richardson, Noel D., Roy-Loubier, Olivier, Schaefer, Gail, Shenar, Tomer, St-Louis, Nicole, Williams, Peredur M.   +12 more
core   +1 more source

Testing evolutionary tracks of Pre-Main Sequence stars: the case of HD113449 [PDF]

, 2008
Evolutionary tracks are of key importance for the understanding of star formation. Unfortunately, tracks published by various groups differ so that it is fundamental to have observational tests. In order to do this, we intend to measure the masses of the
E. Covino, E. W. Guenther, Eric Stempels, F. Cusano, J. M. Alcalà, M. Esposito, M. Mundt   +6 more
core   +2 more sources