Line shift, line asymmetry, and the <b>$\mathsf{^6}$</b>Li/<b>$\mathsf{^7}$</b>Li isotopic ratio determination
R. CayrelGEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 61 Av. de l'Observatoire, 75014 Paris, FranceM. SteffenAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyHum ChandInstitut d'Astrophysique de Paris, 98bis bd Arago, 75014 Paris, FranceP. BonifacioCIFIST, Marie Curie Excellence TeamM. SpiteGEPI, Observatoire de Paris, CNRS, Université Paris Diderot, Place Jules Janssen, 92190 Meudon, France e-mail: [email protected]F. SpiteGEPI, Observatoire de Paris, CNRS, Université Paris Diderot, Place Jules Janssen, 92190 Meudon, France e-mail: [email protected]P. PetitjeanInstitut d'Astrophysique de Paris, 98bis bd Arago, 75014 Paris, FranceH.‐G. LudwigCIFIST, Marie Curie Excellence TeamE. CaffauGEPI, Observatoire de Paris, CNRS, Université Paris Diderot, Place Jules Janssen, 92190 Meudon, France e-mail: [email protected]
2007en
ABI
Аннотация
Context.Line asymmetries are generated by convective Doppler shifts in stellar atmospheres, especially in metal-poor stars, where convective motions penetrate to higher atmospheric levels. Such asymmetries are usually neglected in abundance analyses. The determination of the isotopic ratio is prone to suffering from such asymmetries, as the contribution of 6Li is a slight blending reinforcement of the red wing of each component of the corresponding 7Li line, with respect to its blue wing.
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2 та иқтибос0 та фойдаланилган манба