Results 51 to 60 of about 1,306,824 (294)

Gamma Cas Stars as Be+White Dwarf Binary Systems

The Astrophysical Journal Letters, 2022
The origin of the bright and hard X-ray emission flux among the γ Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) companion.
Douglas R. Gies, Luqian Wang, Robert Klement   +2 more
doaj   +1 more source

A Survey for Spectroscopic Binaries among Very Low Mass Stars [PDF]

The Astronomical Journal, 2006
We report on the results of a survey for radial velocity variability in a heterogeneous sample of very low-mass stars and brown dwarfs. One distinguishing characteristic of the survey is its timespan, which allows an overlap between spectroscopic binaries and those which can be found by high angular-resolution imaging.
Basri, Gibor, Reiners, Ansgar
openaire   +2 more sources

A Novel Modified Petroresin Particle (MPRP) With Enhanced Oil–Water Selectivity for Cold Production in Heavy Oil Reservoirs

Advanced Functional Materials, EarlyView.
A novel oil–water selective conformance control agent, MPRP, is prepared via hydrophilic grafting and mechanical granulation. MPRP uniformly disperses in water, cohesively expands upon aging, and readily dissolves in the oil phase. During conformance control, it selectively aggregates in water channeling pathways to form effective plugs without ...
Guang Zhao, Dongfang Lv, Chang Liu, Changxu Wu, Yifei Liu, Caili Dai, Huazhou Li   +6 more
wiley   +1 more source

The Binary Fraction of B-type Runaway Stars from LAMOST DR8

The Astrophysical Journal
Runaway stars are defined as stars that depart from their birth clusters at high peculiar velocities. There are two main mechanisms for the formation of runaway stars, i.e., the binary-supernova scenario (BSS) and the dynamical ejection scenario (DES ...
Kun Chen, Yanjun Guo, Dengkai Jiang, Zhanwen Han, Xuefei Chen   +4 more
doaj   +1 more source

The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems

The Astronomical Journal, 2023
Close binary interactions may play a critical role in the formation of the rapidly rotating Be stars. Mass transfer can result in a mass gainer star spun up by the accretion of mass and angular momentum, while the mass donor is stripped of its envelope ...
Luqian Wang, Douglas R. Gies, Geraldine J. Peters, Zhanwen Han   +3 more
doaj   +1 more source

Spectroscopic binary frequency among CNO stars

The Astrophysical Journal Supplement Series, 1988
Les observations spectroscopiques de 35 etoiles de type OB ayant des anomalies de carbone, azote et oxygene sont presentees. Les vitesses radiales sont mesurees raie par raie pour chacune des etoiles. L'analyse statistique des resultats confirme que la frequence des binaires spectroscopiques de courte periode est plus grande chez les etoiles de type ...
Hugo Levato, Nidia Morrell, Beatriz Garcia, Stella Malaroda   +3 more
openaire   +1 more source

SPECTROSCOPIC METALLICITY DETERMINATIONS FOR W UMa-TYPE BINARY STARS [PDF]

The Astronomical Journal, 2013
This study is an attempt to determine the metallicities of WUMa-type binary stars using spectroscopy. ~4,500 spectra collected at the David Dunlap Observatory were subject to the same Broadening Function processing to determine the combined line strength in the spectral window centered on the MgI triplet (5080-5285A).
Rucinski, S M, Pribulla, T, Budaj, Jan
openaire   +3 more sources

Nanoscale Spatial Tuning of Superconductivity in Cuprate Thin Films via Direct Laser Writing

Advanced Functional Materials, EarlyView.
Maskless direct laser writing enables local control of oxygen stoichiometry in epitaxial YBCO thin films under ambient conditions. Sub‐micrometer grayscale patterns with tunable optical response and superconducting transport properties are achieved.
Irene Biancardi, Valerio Levati, Jordi Alcalà, Thomas Günkel, Nicolas Lejeune, Riccardo Girelli, Alejandro V. Silhanek, Valeria Russo, Narcís Mestres, Daniela Petti, Anna Palau, Edoardo Albisetti   +11 more
wiley   +1 more source

The CARMENES search for exoplanets around M dwarfs. Nine new double-line spectroscopic binary stars [PDF]

, 2018
Context. The CARMENES spectrograph is surveying ̃300 M dwarf stars in search for exoplanets. Among the target stars, spectroscopic binary systems have been discovered, which can be used to measure fundamental properties of stars.
R. Luque, D. Montes, Montes, D., Ribas, I., D. Hidalgo, Herrero, Enrique, Colomé, J., Rosich, A., Trifonov, T., D. Baroch, Cardona Guillén, C., Perger, M., E. Díez-Alonso, Hagen, H.-J., A. Kaminski, Baroch, D., Henning, T., G. Nowak, Béjar, V., Luque, R., M. Lafarga, Baroch, David, A. Quirrenbach, S. Lalitha, Rosich, Albert, Nagel, E., M. Zechmeister, Passegger, V. M., Herrero, E., Jeffers, S. V., E. W. Guenther, Hagen, Hans-Jürgen, Cortés-Contreras, M., Reiners, Ansgar, Zechmeister, Mathias, M. Kürster, J. Colomé, V. M. Passegger, Schmitt, J. H. M. M., Béjar, Victor J. S., A. Rosich, Dreizler, S., E. Herrero, Morales, Juan Carlos, E. Pallé, Passegger, V.M., Amado, P., H.-J. Hagen, Jeffers, Sandra V., I. Ribas, S. V. Jeffers, E. Nagel, Morales, J. C., A. Schweitzer, Galadí-Enríquez, D., Morales, J., M. Cortés-Contreras, Quirrenbach, A., Amado, Pedro J., Díez-Alonso, E., Jeffers, S., Amado, P. J., V. J. S. Béjar, Caballero, J. A., Ribas, Ignasi, Passegger, V., Hidalgo, D., J. Aceituno, Kossakowski, D., C. Cardona Guillén, Schweitzer, A., J. C. Morales, Nowak, G., Seifert, W., Lalitha, S., Guenther, E., D. Kossakowski, M. Perger, Zechmeister, M., A. Reiners, Lafarga, M., Kürster, M., T. Henning, Caballero, J., Pallé, E., Béjar, V. J. S., Aceituno, J., Nagel, Evangelos, Henning, Thomas, Dreizler, Stefan, Tal-Or, L., W. Seifert, Schweitzer, Andreas, Montes, David, Kaminski, A., Hagen, H., Quirrenbach, Andreas, S. Dreizler, L. Tal-Or, D. Galadí-Enríquez, J. H. M. M. Schmitt, P. J. Amado, Guenther, E. W., T. Trifonov, Tal-Or, Lev, Reiners, A., J. A. Caballero   +106 more
core   +1 more source

paired: A Statistical Framework for Detecting Stellar Binarity with Gaia RVs. I. Sensitivity to Unresolved Binaries

The Astrophysical Journal
Data Release 3 (DR3) from the Gaia Mission includes radial velocity measurements of over 33 million targets. Among many scientific applications, the overlap of this stellar sample with targeted exoplanet transit survey stars presents an opportunity to ...
Quadry Chance, Daniel Foreman-Mackey, Sarah Ballard, Andrew R. Casey, Trevor J. David, Adrian M. Price-Whelan   +5 more
doaj   +1 more source