Results 21 to 30 of about 1,023,117 (334)

The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: selecting emission line galaxies using the Fisher discriminant [PDF]

, 2015
We present a new selection technique of producing spectroscopic target catalogues for massive spectroscopic surveys for cosmology. This work was conducted in the context of the extended Baryon Oscillation Spectroscopic Survey (eBOSS), which will use ~200
Abdalla, F. B., Comparat, J., Dawson, K., De La Macorra, A., Delubac, T., Fan, X., Fan, Z., Jiang, Z., Jing, Y., Jouvel, S., Kneib, J.-P., Lang, D., Lesser, M., Li, C., Ma, J., Newman, J. A., Nie, J., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Raichoor, A., Shen, S., Wang, J., Wu, Z., Yèche, Ch., Zhang, T., Zhou, Xin, Zhou, Z., Zou, H.   +28 more
core   +5 more sources

A Statistical Study of the Si IV Resonance Line Parameters in 19 Be Stars

Open Astronomy, 2011
Using the GR model, we analyze the ultraviolet Si IV resonance lines in the spectra of 19 Be stars of different spectral subtypes, in order to detect the presence of absorption components and to analyze their characteristics.
Antoniou A., Danezis E., Lyratzi E., Stathopoulos D., Dimitrijević M. S.   +4 more
doaj   +1 more source

Chemical and Biological Properties of Quinochalcone C-Glycosides from the Florets of Carthamus tinctorius

Molecules, 2013
Quinochalcone C-glycosides are regarded as characteristic components that have only been isolated from the florets of Carthamus tinctorius. Recently, quinochalcone C-glycosides were found to have multiple pharmacological activities, which has attracted ...
Shijun Yue, Yuping Tang, Shujiao Li, Jin-Ao Duan   +3 more
doaj   +1 more source

Physical Properties of Radio Stars Based on LAMOST Spectral Survey

Universe, 2022
Radio emission has been detected for all types of stars in the Hertzsprung Russell diagram. Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low and medium-resolution spectroscopic surveys provide a good opportunity to obtain the ...
Liyun Zhang, Yao Cheng, Xianming L. Han, Qingfeng Pi, Prabhakar Misra, Baoda Li, Zhongzhong Zhu   +6 more
doaj   +1 more source

Non-thermal broadening of IRIS Fe XXI line caused by turbulent plasma flows in the magnetic reconnection region during solar eruptions

Frontiers in Astronomy and Space Sciences, 2023
Magnetic reconnection is the key mechanism for energy release in solar eruptions, where the high-temperature emission is the primary diagnostic for investigating the plasma properties during the reconnection process.
Chengcai Shen, Vanessa Polito, Vanessa Polito, Vanessa Polito, Katharine K. Reeves, Bin Chen, Sijie Yu, Xiaoyan Xie   +7 more
doaj   +1 more source

Early-type stars in the young open cluster NGC 2244 and in the Mon OB2 association I. The multiplicity of O-type stars [PDF]

, 2009
Aims. We present the results obtained from a long-term spectroscopic campaign devoted to the multiplicity of O-type stars in the young open cluster NGC2244 and in the Mon OB2 association. Methods.
Bisiacchi, Chen, Conti, Conti, Conti, Conti, Conti, Cruz-González, De Becker, De Becker, de Wit, E. Gosset, Feldmeier, Frost, Fullerton, G. Rauw, García, Garmany, Gies, González, Gosset, H. Sana, Heck, Hensberge, Hiltner, Huang, Johnson, Kharchenko, L. Mahy, Li, Linder, Lindroos, Liu, M. De Becker, Martins, Martins, Mason, Mason, Massey, Mathys, Mathys, Maíz-Apellániz, Morgan, Morgan, Munari, Ogura, P. Eenens, Penny, Petrie, Plaskett, Pérez, Rauw, Sana, Sana, Sana, Sanford, Simón-Díaz, Stickland, Tadross, Turner, Turner, Underhill, Walborn, Walborn, Walborn, Wang, Y. Nazé, Zagury, Zinnecker   +68 more
core   +2 more sources

Generation of 656 nm coherent red-light by frequency-doubled Nd:YLiF4/β-BaB2O4 laser for a compact silver atoms optical clock [PDF]

International Journal of Metrology and Quality Engineering, 2012
We describe an efficient continuous-wave diode-pumped Nd:YLiF4 laser oscillating on the σ-polarized 4F3/2-4I13/2 transition at λω = 1312 nm.
Loisel J.-P., Topsu S., Chassagne L., Alayli Y., Dahoo P.R., Juncar P.   +5 more
doaj   +1 more source

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

The IACOB project. V. Spectroscopic parameters of the O-type stars in the modern grid of standards for spectral classification [PDF]

, 2018
The IACOB and OWN surveys are two ambitious complementary observational projects which have made available a large multi-epoch spectroscopic database of optical high resolution spectra of Galactic massive O-type stars. As a first step in the study of the
Apellániz, J. Maíz, Barbá, R. H., Castro, N., Garcia, M., Herrero, A., Holgado, G., Negueruela, I., Puls, J., Sabín-Sanjulián, C., Simón-Díaz, S.   +9 more
core   +3 more sources

Synthesis and spectroscopic study of adhesive polymer materials based on urea-formaldehyde and isoamyl alcohol [PDF]

BIO Web of Conferences
The synthesis and identification of adhesive polymer materials based on urea-formaldehyde and isoamyl alcohol represent a crucial area of research in the field of materials science and industrial applications.
Nazarov Saifulla, Amrieva Sabina, Ganiev Bakhtiyor, Nazarov Nurulla   +3 more
doaj   +1 more source