A Cosmic Abundance Standard: Chemical Homogeneity of the Solar Neighborhood and the ISM Dust-Phase Composition TeX Export

@article{citeulike:3804742, abstract = {doi: 10.1086/595618 ABSTRACT A representative sample of unevolved early B-type stars in nearby OB associations and the field is analyzed to unprecedented precision using NLTE techniques. The resulting chemical composition is found to be more metal-rich and much more homogeneous than indicated by previous work. A rms scatter of 10\% in abundances is found for the six stars (and confirmed by six evolved stars), the same as reported for ISM gas-phase abundances. A cosmic abundance standard for the present-day solar neighborhood is proposed, implying mass fractions for hydrogen, helium, and metals of \$X=0.715\$ , \$Y=0.271\$ , and \$Z=0.014\$ . Good agreement with solar photospheric abundances as reported from recent 3D radiative-hydrodynamical simulations of the solar atmosphere is obtained. As a first application we use the cosmic abundance standard as a proxy for the determination of the local ISM dust-phase composition, putting tight observational constraints on dust models.}, author = {Przybilla, Norbert and Nieva, Maria-Fernanda and Butler, Keith}, citeulike-article-id = {3804742}, citeulike-linkout-0 = {http://dx.doi.org/10.1086/595618}, citeulike-linkout-1 = {http://www.journals.uchicago.edu/doi/abs/10.1086/595618}, day = {1}, doi = {10.1086/595618}, journal = {The Astrophysical Journal Letters}, keywords = {abundance, cosmic}, month = {December}, number = {2}, pages = {L103--L106}, posted-at = {2008-12-18 06:34:09}, priority = {2}, title = {A Cosmic Abundance Standard: Chemical Homogeneity of the Solar Neighborhood and the ISM Dust-Phase Composition}, url = {http://dx.doi.org/10.1086/595618}, volume = {688}, year = {2008} }

TY - JOUR ID - citeulike:3804742 L3 - citeulike-article-id:3804742 N2 - doi: 10.1086/595618 ABSTRACT A representative sample of unevolved early B-type stars in nearby OB associations and the field is analyzed to unprecedented precision using NLTE techniques. The resulting chemical composition is found to be more metal-rich and much more homogeneous than indicated by previous work. A rms scatter of 10% in abundances is found for the six stars (and confirmed by six evolved stars), the same as reported for ISM gas-phase abundances. A cosmic abundance standard for the present-day solar neighborhood is proposed, implying mass fractions for hydrogen, helium, and metals of $X=0.715$ , $Y=0.271$ , and $Z=0.014$ . Good agreement with solar photospheric abundances as reported from recent 3D radiative-hydrodynamical simulations of the solar atmosphere is obtained. As a first application we use the cosmic abundance standard as a proxy for the determination of the local ISM dust-phase composition, putting tight observational constraints on dust models. IS - 2 JF - The Astrophysical Journal Letters EP - L106 TI - A Cosmic Abundance Standard: Chemical Homogeneity of the Solar Neighborhood and the ISM Dust-Phase Composition VL - 688 SP - L103 KW - abundance KW - cosmic AU - Przybilla, Norbert AU - Nieva, Maria-Fernanda AU - Butler, Keith PY - 2008/12/01/ UR - http://dx.doi.org/10.1086/595618 ER -