Galactic Globular and Open Clusters in the Sloan DIGITal Sky Survey. I. Crowded-Field Photometry and Cluster Fiducial Sequences in Ugriz

dc.contributor.utaustinauthorPrieto, Carlos Allenden_US
dc.creatorAn, Deokkeunen_US
dc.creatorJohnson, Jennifer A.en_US
dc.creatorClem, James L.en_US
dc.creatorYanny, Brianen_US
dc.creatorRockosi, Constance M.en_US
dc.creatorMorrison, Heather L.en_US
dc.creatorHarding, Paulen_US
dc.creatorGunn, James E.en_US
dc.creatorPrieto, Carlos Allendeen_US
dc.creatorBeers, Timothy C.en_US
dc.creatorCudworth, Kyle M.en_US
dc.creatorIvans, Inese I.en_US
dc.creatorIvezic, Zeljkoen_US
dc.creatorLee, Young Sunen_US
dc.creatorLupton, Robert H.en_US
dc.creatorBizyaev, Dmitryen_US
dc.creatorBrewington, Howarden_US
dc.creatorMalanushenko, Elenaen_US
dc.creatorMalanushenko, Viktoren_US
dc.creatorOravetz, Danen_US
dc.creatorPan, Kaikeen_US
dc.creatorSimmons, Audreyen_US
dc.creatorSnedden, Stephanieen_US
dc.creatorWatters, Shannonen_US
dc.creatorYork, Donald G.en_US
dc.description.abstractWe present photometry for globular and open cluster stars observed with the Sloan Digital Sky Survey (SDSS). In order to exploit the over 100 million stellar objects with r < 22:5 mag observed by SDSS, we need to understand the characteristics of stars in the SDSS ugriz filters. While star clusters provide important calibration samples for stellar colors, the regions close to globular clusters, where the fraction of field stars is smallest, are too crowded for the standard SDSS photometric pipeline to process. To complement the SDSS imaging survey, we reduce the SDSS imaging data for crowded cluster fields using the DAOPHOT/ALLFRAME suite of programs and present photometry for 17 globular clusters and three open clusters in a SDSS value-added catalog. Our photometry and cluster fiducial sequences are on the native SDSS 2.5 m ugriz photometric system, and the fiducial sequences can be directly applied to the SDSS photometry without relying on any transFormations. Model photometry for red giant branch and main-sequence stars obtained by Girardi et al. cannot be matched simultaneously to fiducial sequences; their colors differ by similar to 0.02-0.05 mag. Good agreement (similar to 0.02 mag in colors) is found with Clem et al. empirical fiducial sequences in u'g'r'i'z' when using the transFormation equations in Tucker et al.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.identifier.citationAn, Deokkeun, Jennifer A. Johnson, James L. Clem, Brian Yanny, Constance M. Rockosi, Heather L. Morrison, Paul Harding et al. "Galactic globular and open clusters in the Sloan Digital Sky Survey. I. Crowded-field photometry and cluster fiducial sequences in ugriz." The Astrophysical Journal Supplement Series, Vol. 179, No. 2 (Dec., 2008): 326.en_US
dc.relation.ispartofserialAstrophysical Journal Supplement Seriesen_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.subjectglobular clusters: generalen_US
dc.subjecthertzsprung-russell diagramen_US
dc.subjectopen clustersen_US
dc.subjectand associations: generalen_US
dc.subjectstars: evolutionen_US
dc.subjectempirically calibrated isochronesen_US
dc.subjectdata releaseen_US
dc.subjectstellar photometryen_US
dc.subjectmodel atmospheresen_US
dc.subjectlocal subdwarfsen_US
dc.subjectstar catalogen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleGalactic Globular and Open Clusters in the Sloan DIGITal Sky Survey. I. Crowded-Field Photometry and Cluster Fiducial Sequences in Ugrizen_US

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