Results 21 to 30 of about 5,043,235 (296)

Influence of surface stressing on stellar coronae and winds [PDF]

, 2013
STFC funding has supported this research.The large-scale field of the Sun is well represented by its lowest energy (or potential) state. Recent observations, by comparison, reveal that many solar-type stars show large-scale surface magnetic fields that ...
Morin, J., Fares, R., Jardine, Moira, Donati, J. -F., Jardine, M., Morin, Julien, Fares, Rim, Donati, J.-F., Vidotto, A. A., Donati, Jean-François, Gombosi, T. I., van Ballegooijen, A., Gombosi, Tamas I.   +12 more
core   +1 more source

Constraining planet structure from stellar chemistry : the cases of CoRoT-7, Kepler-10, and Kepler-93 [PDF]

, 2015
This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012,
Mortier, Annelies, A. Mortier, Dorn, Caroline, Sousa, S. G., Santos, N. C., Delgado-Mena, E., Benz, Willy, Mordasini, Christoph, Pepe, F., Mortier, A.; id_orcid, Mortier, A., F. Pepe, Figueira, P., Adibekyan, V., Udry, S., C. Mordasini, A. Santerne, Santerne, A., W. Benz, Dorn, C., V. Adibekyan, E. Delgado-Mena, Buchhave, L., S. G. Sousa, Mordasini, C., S. Udry, N. C. Santos, Buchhave, Lars A., Benz, W., P. Figueira, L. Buchhave, C. Dorn   +31 more
core   +3 more sources

Study on Spectral Interference in the Determination of Vanadium by ICP-OES

, 2020
Vanadium is an important scarce resource and strategic metal, and often coexists with a variety of complex metals in the form of secondary mineral phases in nature.
Zhang Yi, Li Ming, Li Lan-jie, Wang Shao-na, Liu Biao, Jin Xing, Du Hao, Zhao Bei-bei   +7 more
core   +1 more source

SPECTRAL TYPING OF LATE-TYPE STELLAR COMPANIONS TO YOUNG STARS FROM LOW-DISPERSION NEAR-INFRARED INTEGRAL FIELD UNIT DATA [PDF]

The Astronomical Journal, 2012
We used the Project 1640 near-infrared coronagraph and integral field spectrograph to observe 19 young solar type stars. Five of these stars are known binary stars and we detected the late-type secondaries and were able to measure their JH spectra with a resolution of R\sim30.
Roberts, Lewis C., Jr., Rice, Emily L., Beichman, Charles A., Brenner, Douglas, Burruss, Rick, Crepp, Justin R., Dekany, Richard G., Hillenbrand, Lynne A., Hinkley, Sasha, Ligon, E. Robert, Lockhart, Thomas G., King, David, Metchev, Stanimir, Oppenheimer, Ben R., Parry, Ian R., Pueyo, Laurent, Roberts, Jennifer E., Shao, Michael, Sivaramakrishnan, Anand, Soummer, Rémi, Vasisht, Gautam, Vescelus, Fred E., Wallace, J. Kent, Zimmerman, Neil T., Zhai, Chengxing   +24 more
openaire   +3 more sources

Stellar spectral-type (mass) dependence of the dearth of close-in planets around fast-rotating stars

Astronomy & Astrophysics, 2023
In 2013 a dearth of close-in planets around fast-rotating host stars was found using statistical tests on Kepler data. The addition of more Kepler and Transiting Exoplanet Survey Satellite (TESS) systems in 2022 filled this region of the diagram of stellar rotation period ( P rot ) versus the planet orbital period ( P orb ).
García, R., Gourves, Clémence, Santos, A.R.G., Strugarek, A., Godoy-Rivera, D., Mathur, S., Delsanti, V., Breton, S.N., Beck, P.G., Brun, A.S., Mathis, S.   +10 more
openaire   +4 more sources

On the Construction of a New 3D Atlas of Stellar Spectral Energy Distributions

Open Astronomy, 2014
Modern spectrophotometric atlases are burdened with significant systematic errors. In particular, the problems of spectrum calibration in the ultraviolet region are not solved; different parts of the spectrum are not thoroughly fit to each other; spectra
Mironov A. V., Zakharov A. I., Moshkalev V. G., Malkov O. Yu., Kilpio E. Yu.   +4 more
doaj   +1 more source

Evidence for Misalignment between Debris Disks and Their Host Stars

The Astrophysical Journal, 2023
We place lower limits on the obliquities between debris disks and their host stars for 31 systems by comparing their disk and stellar inclinations.
Spencer A. Hurt, Meredith A. MacGregor
doaj   +1 more source

Quantitative Stellar Spectral Classification. II. Early Type Stars

, 2002
The method developed by Stock and Stock (1999) for stars of spectral types A to K to derive absolute magnitudes and intrinsic colors from the equivalent widths of absorption lines in stellar spectra is extended to B-type stars. Spectra of this type of stars for which the Hipparcos Catalogue gives parallaxes with an error of less than 20% were observed ...
Stock, M. J., Stock, J., Garcia, J., Sanchez, N.   +3 more
openaire   +2 more sources

Resonant structures in exozodiacal clouds created by exo-Earths in the habitable zone of late-type stars

Astronomy & Astrophysics
Context. Earth-like exoplanets can create resonant structures in exozodiacal dust through mean motion resonances. These structures not only suggest the presence of such planets but also act as potential noise sources in future mid-infrared nulling ...
Lee Seung-Yoo, Ishiguro Masateru, Jo Hangbin, Yoon Sung-Chul   +3 more
doaj   +1 more source

Spectral Characteristics of Biological Soil Crusts under the Different Types in the Water-Wind Erosion Crisscross Region on the Loess Plateau

, 2018
The study on spectral characteristics of biological soil crust in the water-wind erosion crisscross region in the Loess Plateau has important scientific value for the identification of biological soil crust based on remote sensing technology at regional ...
Sun, WY (reprint author), Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China., Zhang Yue, Mu Xing-min, Tian Yuan-sheng, Sun Wen-yi, Sun, WY (reprint author), Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China., Zhao Guang-ju, Gao Peng   +7 more
core   +1 more source