Results 21 to 30 of about 45,248 (299)

Velocity Curve Analysis of the Spectroscopic Binary Stars V373 Cas, V2388 Oph, V401 Cyg, GM Dra, V523 Cas, AB And, and HD 141929 by Artificial Neural Networks

, 2009
We used an Artificial Neural Network (ANN) to derive the orbital parameters of spectroscopic binary stars. Using measured radial velocity data of seven double-lined spectroscopic binary systems V373 Cas, V2388 Oph, V401 Cyg, GM Dra, V523 Cas, AB And, and
Bazarghan, Carrier, Hill, K. Ghaderi, K. Karami, Karami, Karami, Karami, Karami, Karami, Lehmann-Filhés, M. M. Soltanzadeh, Petrie, R. Mohebi, R. Sadeghi, Smart   +15 more
core   +1 more source

A Spectroscopic Study of Field and Runaway OB Stars

, 2006
Identifying binaries among runaway O- and B-type stars offers valuable insight into the evolution of open clusters and close binary stars. Here we present a spectroscopic investigation of 12 known or suspected binaries among field and runaway OB stars ...
Allen C., Aslanov A. A., Aslanov A. A., Beardsley W. R., Blaauw A., Douglas R. Gies, Erika D. Grundstrom, Keenan F. P., M. Virginia McSwain, Mayer P., Moffat A. F. J., Plaskett J. S., Poveda A., Schaller G., Stickland D. J., Tabetha S. Boyajian, Voges W., Wesselius P. R., Zejnalov S. K.   +18 more
core   +1 more source

The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems [PDF]

, 2016
This is the third installment of GOSSS, a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R~2500 digital observations selected from the Galactic O-Star Catalog (GOSC).
Alfaro, E. J., Apellániz, J. Maíz, Arias, J. I., Barbá, R. H., Gamen, R. C., Herrero, A., Leão, J. R. S., Marco, A., Negueruela, I., Simón-Díaz, S., Sota, A., Walborn, N. R.   +11 more
core   +4 more sources

The occurrence of classical Cepheids in binary systems

, 2014
Classical Cepheids, like binary stars, are laboratories for stellar evolution and Cepheids in binary systems are especially powerful ones. About one-third of Galactic Cepheids are known to have companions and Cepheids in eclipsing binary systems have ...
Evans, Nancy R., Izzard, Robert G., Langer, Norbert, Neilson, Hilding R., Schneider, Fabian R. N.   +4 more
core   +1 more source

Towards an Accurate Determination of Parameters for Very Massive Stars: the Eclipsing Binary LMC-SC1-105 [PDF]

, 2008
This paper presents a photometric and spectroscopic study of the bright blue eclipsing binary LMC-SC1-105, selected from the OGLE catalog as a candidate host of very massive stars (>=30Mo).
Alceste Z. Bonanos, Andersen, Bagnuolo, Bally, Bonanos, Bonanos, Bonanos, Bouret, Bromm, Claret, Derekas, Elmegreen, Faccioli, Fitzpatrick, Gies, González, Hadrava, Herrero, Hilditch, Howarth, Kelson, Krumholz, Lanz, Massey, Massey, Massey, Mayer, Maíz Apellániz, Mochnacki, Nelson, O'Connell, Oey, Pinsonneault, Prša, Ribas, Santolaya-Rey, Schaerer, Schaller, Schwarzenberg-Czerny, Simon, Soszynski, Stickland, Walborn, Zebrun   +43 more
core   +1 more source

Chemically Peculiar Stars Among Spectroscopic Binaries – Revisited [PDF]

International Astronomical Union Colloquium, 1993
AbstractThis paper presents a new statistical investigation of peculiar A-type stars (Am, Ap, Hg-Mn) among spectroscopic binary (SB) stars. The relative frequency of Am (CP 1) stars is 55% in the spectral range A1 to A6 of main-sequence stars. The Ap (CP 2) stars amount to 15% in the range B9 to A2.
openaire   +1 more source

Mining Double-line Spectroscopic Candidates in the LAMOST Medium-resolution Spectroscopic Survey Using a Human–AI Hybrid Method

The Astrophysical Journal Supplement Series
We utilize a hybrid approach that integrates the traditional cross-correlation function (CCF) and machine learning to detect spectroscopic multiple star systems, specifically focusing on double-line spectroscopic binaries (SB2s).
Shan-shan Li, Chun-qian Li, Chang-hua Li, Dong-wei Fan, Yun-fei Xu, Lin-ying Mi, Chen-zhou Cui, Jian-rong Shi   +7 more
doaj   +1 more source

Lithium abundances in CEMP stars

, 2012
Carbon-enhanced metal-poor (CEMP) stars are believed to show the chemical imprints of more massive stars (M > 0.8 Msun) that are now extinct. In particular, it is expected that the observed abundance of Li should deviate in these stars from the standard ...
Abia, Alvarez, Amanda Karakas, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Asplund, Asplund, Bertrand Plez, Christlieb, Cohen, Cristallo, Denissenkov, Denissenkov, Eggleton, Frebel, Goriely, Herwig, Hobbs, Iwamoto, Jennifer A. Johnson, Johnson, Johnson, Karakas, Lawler, Lucatello, Lucatello, Lucatello, Lucatello, Lucatello, Masseron, Nollett, Norbert Christlieb, Norris, Norris, Norris, Norris, Palmerini, Preston, Richard, Roederer, Ryan, Ryan, Sara Lucatello, Siess, Sneden, Spite, Spite, Steffen, Suda, Suda, Thomas Masseron, Thompson, Thorburn, Timothy C. Beers, Tsangarides, VandenBerg   +60 more
core   +3 more sources

The eclipsing, double-lined, Of supergiant binary Cyg OB2-B17 [PDF]

, 2010
Massive, eclipsing, double-lined, spectroscopic binaries are not common but are necessary to understand the evolution of massive stars as they are the only direct way to determine stellar masses.
A. J. Norton, Bonanos, Clark, Clark, Clark, Comerón, Contreras, Crowther, De Becker, F. Vilardell, Figer, Figer, Gies, Hanson, Hilditch, I. Negueruela, J. S. Clark, Kiminki, Kiminki, Kiminki, Knödlseder, Kobulnicky, Linder, Martins, Martins, Martins, Martins, Massey, Maíz Apellániz, Meynet, Miczaika, Nazé, Negueruela, P. Roche, Prinja, Rauw, Rauw, Ribas, Rieke, Ritchie, Romano, Sana, Schaller, Schnurr, Torres-Dodgen, V. E. Stroud, Walborn, Walborn, Walborn, Wegner, Wilson, Wilson, Wilson, Wózniak   +53 more
core   +3 more sources

Analysing the significance of small conformational changes and low occupancy states in serial crystallographic data

FEBS Open Bio, EarlyView.
This protocol paper outlines methods to establish the success of a time‐resolved serial crystallographic experiment, by means of statistical analysis of timepoint data in reciprocal space and models in real space. We show how to amplify the signal from excited states to visualise structural changes in successful experiments.
Jake Hill, Yelyzaveta Pulnova, Elke De Zitter, Helen M. Ginn, Briony A. Yorke   +4 more
wiley   +1 more source