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dc.creatorLuck, R. Earleen_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-04-22T19:48:47Z
dc.date.available2016-04-22T19:48:47Z
dc.date.issued2011-10en
dc.identifierdoi:10.15781/T29B8B
dc.identifier.citationLuck, R. Earle, and David L. Lambert. >The Distribution of the Elements in the Galactic Disk. III. A Reconsideration of Cepheids from l= 30° to 250°.> The Astronomical Journal, Vol. 142, No. 4 (Oct., 2011): 136.en_US
dc.identifier.issn0004-6256en_US
dc.identifier.urihttp://hdl.handle.net/2152/34561
dc.description.abstractThis paper reports on the spectroscopic investigation of 238 Cepheids in the northern sky. Of these stars, about 150 are new to the study of the galactic abundance gradient. These new Cepheids bring the total number of Cepheids involved in abundance distribution studies to over 400. In this work, we also consider systematics between various studies and also those which result from the choice of models. We find that systematic variations exist at the 0.06 dex level both between studies and model atmospheres. In order to control the systematic effects our final gradients depend only on abundances derived herein. A simple linear fit to the Cepheid data from 398 stars yields a gradient d[Fe/H]/dR(G) = -0.062 +/- 0.002 dex kpc(-1) which is in good agreement with previously determined values. We have also re-examined the region of the >metallicity island> of Luck et al. With the doubling of the sample in that region and our internally consistent abundances, we find that there is scant evidence for a distinct island. We also find in our sample the first reported Cepheid (V1033 Cyg) with a pronounced Li feature. The Li abundance is consistent with the star being on its redward pass toward the first giant branch.en_US
dc.description.sponsorshipRobert A. Welch Foundation of Houston, Texas F-634en_US
dc.language.isoEnglishen_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.subjectgalaxy: abundancesen_US
dc.subjectgalaxy: evolutionen_US
dc.subjectstars: abundancesen_US
dc.subjectstars:en_US
dc.subjectvariables: cepheidsen_US
dc.subjectphase-dependent variationen_US
dc.subjectmain-sequence starsen_US
dc.subjectline-depth ratiosen_US
dc.subjectabundance gradienten_US
dc.subjectfundamental parametersen_US
dc.subjectchemical-compositionen_US
dc.subjectsolaren_US
dc.subjectneighborhooden_US
dc.subjectclassical cepheidsen_US
dc.subjectmodel atmospheresen_US
dc.subjectoxygen abundancesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Distribution Of The Elements In The Galactic Disk. III. A Reconsideration Of Cepheids From L=30 Degrees To 250 Degreesen_US
dc.typeArticleen_US
dc.description.departmentMcDonald Observatoryen_US
dc.identifier.doi10.1088/0004-6256/142/4/136en_US
dc.contributor.utaustinauthorLambert, David L.en_US
dc.relation.ispartofserialAstronomical Journalen_US


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