LiHe spectra from brown dwarfs to helium clusters
Autor: | Grégoire Guillon, John F. Kielkopf, Frank Stienkemeier, Nicole F. Allard, Akira Nakayama, Alexandra Viel |
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Přispěvatelé: | Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Division of Chemistry, Graduate School of Science, Hokkaido University [Sapporo, Japan], Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Department of Physics and Astronomy [Louisville], University of Louisville, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2014 |
Předmět: |
Atmospheric Science
Line: profiles Brown dwarf Aerospace Engineering chemistry.chemical_element Astrophysics Stellar classification Resonance (particle physics) Spectral line Stars: atmospheres-brown dwarfs chemistry.chemical_compound Astrophysics::Solar and Stellar Astrophysics LiHe Spectroscopy Astrophysics::Galaxy Astrophysics Helium Line (formation) Physics Solar mass Astronomy and Astrophysics [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Geophysics chemistry Helium clusters Space and Planetary Science General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics Atomic physics Atomic and molecular clusters [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
Zdroj: | Advances in Space Research Advances in Space Research, Elsevier, 2014, 54, pp.1290-1296. ⟨10.1016/j.asr.2013.08.032⟩ Advances in Space Research, 2014, 54, pp.1290-1296. ⟨10.1016/j.asr.2013.08.032⟩ |
ISSN: | 0273-1177 |
Popis: | International audience; The detection of Li I lines is the most decisive spectral indicator of substellarity for young brown dwarfs with masses below about 0.06 solar mass. Due to the weakness of the Li resonance lines, it is important to be able to model precisely both their core widths and their wing profiles. This allows an adequate prediction of the mass at which Li lines reappear in the spectra of brown dwarfs for a given age, or reversely an accurate determination of the age of a cluster. We report improved line profiles and the dependence of line width on temperature suitable for modeling substellar atmospheres that were determined from new LiHe molecular potential energies. Over a limited range of density and temperature, comparison with laboratory measurements was used to validate the potential energies which support the spectral line profile theory. |
Databáze: | OpenAIRE |
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