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dc.creatorWalker, Kyle M.en_US
dc.creatorFederman, S. R.en_US
dc.creatorKnauth, David C.en_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-04-28T19:32:39Z
dc.date.available2016-04-28T19:32:39Z
dc.date.issued2009-11en
dc.identifierdoi:10.15781/T2HB9K
dc.identifier.citationWalker, Kyle M., S. R. Federman, David C. Knauth, and David L. Lambert. "Rubidium in the Interstellar Medium." The Astrophysical Journal, Vol. 706, No. 1 (Nov., 2009): 614.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34691
dc.description.abstractWe present observations of interstellar rubidium toward o Per, zeta Per, AE Aur, HD 147889, chi Oph, zeta Oph, and 20 Aql. Theory suggests that stable (85)Rb and long-lived (87)Rb are produced predominantly by high-mass stars, through a combination of the weak s- and r-processes. The (85)Rb/(87)Rb ratio was determined from measurements of the Rb I line at 7800 angstrom and was compared to the solar system meteoritic ratio of 2.59. Within 1 sigma uncertainties, all directions except HD 147889 have Rb isotope ratios consistent with the solar system value. The ratio toward HD 147889 is much lower than themeteoritic value and similar to that toward rho Oph A; both lines of sight probe the Rho Ophiuchus Molecular Cloud. The earlier result was attributed to a deficit of r-processed (85)Rb. Our larger sample suggests instead that (87)Rb is enhanced in these two lines of sight. When the total elemental abundance of Rb is compared to the K elemental abundance, the interstellar Rb/K ratio is significantly lower than the meteoritic ratio for all the sight lines in this study. Available interstellar samples for other s- and r-process elements are used to help interpret these results.en_US
dc.description.sponsorshipRobert A. Welch Foundation of Houston F-634en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectism: abundancesen_US
dc.subjectism: atomsen_US
dc.subjectstars: individual (omicron persei, zetaen_US
dc.subjectpersei, ae aurigae, hd 147889, chi ophiuchi, zeta ophiuchi, 20 aquilae)en_US
dc.subjecthigh-resolution surveyen_US
dc.subjectresonance-absorption linesen_US
dc.subjects-processen_US
dc.subjectchemical-compositionen_US
dc.subjectcross-sectionen_US
dc.subjectradiative recombinationen_US
dc.subjectwavelengths longwarden_US
dc.subjectneutron-captureen_US
dc.subjectgalactic disken_US
dc.subjectisotope ratioen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleRubidium In The Interstellar Mediumen_US
dc.typeArticleen_US
dc.description.departmentMcDonald Observatoryen_US
dc.identifier.Filename2009_11_rubidium.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/706/1/614en_US
dc.contributor.utaustinauthorLambert, David L.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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