The Absolute Magnitude Of RRc Variables From Statistical Parallax

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dc.contributor.utaustinauthorSneden, Christopheren_US
dc.creatorKollmeier, Juna A.en_US
dc.creatorSzczygiel, Dorota M.en_US
dc.creatorBurns, Christopher R.en_US
dc.creatorGould, Andrewen_US
dc.creatorThompson, Ian B.en_US
dc.creatorPreston, George W.en_US
dc.creatorSneden, Christopheren_US
dc.creatorCrane, Jeffrey D.en_US
dc.creatorDong, Suboen_US
dc.creatorMadore, Barry F.en_US
dc.creatorMorrell, Nidiaen_US
dc.creatorPrieto, Jose L.en_US
dc.creatorShectman, Stephenen_US
dc.creatorSimon, Joshua D.en_US
dc.creatorVillanueva, Edwarden_US
dc.date.accessioned2016-04-28T22:22:26Z
dc.date.available2016-04-28T22:22:26Z
dc.date.issued2013-09en
dc.description.abstractWe present the first definitive measurement of the absolute magnitude of RR Lyrae c-type variable stars (RRc) determined purely from statistical parallax. We use a sample of 242 RRc variables selected from the All Sky Automated Survey for which high-quality light curves, photometry, and proper motions are available. We obtain high-resolution echelle spectra for these objects to determine radial velocities and abundances as part of the Carnegie RR Lyrae Survey. We find that M-V,M-RRc = 0.59 +/- 0.10 at a mean metallicity of [Fe/H] = -1.59. This is to be compared with previous estimates for RRab stars (M-V,M-RRab = 0.76 +/- 0.12) and the only direct measurement of an RRc absolutemagnitude (RZ Cephei, M-V,M-RRc = 0.27 +/- 0.17). We find the bulk velocity of the halo relative to the Sun to be (W-pi, W-theta, W-z) = (12.0,-209.9, 3.0) km s(-1) in the radial, rotational, and vertical directions with dispersions (sigma(W pi), sigma(W theta), sigma(Wz)) = (150.4, 106.1, 96.0) km s(-1). For the disk, we find (W-pi, W-theta, W-z) = (13.0,-42.0,-27.3) km s(-1) relative to the Sun with dispersions (sigma(W pi), sigma(W theta), sigma(Wz)) = (67.7, 59.2, 54.9) km s(-1). Finally, as a byproduct of our statistical framework, we are able to demonstrate that UCAC2 proper-motion errors are significantly overestimated as verified by UCAC4.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipen_US
dc.identifierdoi:10.15781/T2HJ9N
dc.identifier.Filename2013_09_absolutemagnitude.pdfen_US
dc.identifier.citationKollmeier, Juna A., Dorota M. Szczygie?, Christopher R. Burns, Andrew Gould, Ian B. Thompson, George W. Preston, Christopher Sneden et al. "The Absolute Magnitude of RRc Variables from Statistical Parallax." The Astrophysical Journal, Vol. 775, No. 1 (Sep., 2013): 57.en_US
dc.identifier.doi10.1088/0004-637x/775/1/57en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35225
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_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.rights.restrictionOpenen_US
dc.subjectdistance scaleen_US
dc.subjectgalaxy: fundamental parametersen_US
dc.subjectgalaxy: kinematics anden_US
dc.subjectdynamicsen_US
dc.subjectgalaxy: structureen_US
dc.subjectstars: distancesen_US
dc.subjectstars: variables: rren_US
dc.subjectlyraeen_US
dc.subjectmetal-poor starsen_US
dc.subjectmaximum-likelihood techniqueen_US
dc.subjectfundamental distanceen_US
dc.subjectscaleen_US
dc.subjectlyrae starsen_US
dc.subjectproper motionsen_US
dc.subjectkey projecten_US
dc.subjectkinematicsen_US
dc.subjectcatalogen_US
dc.subjectsystematicsen_US
dc.subjectmetallicitiesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Absolute Magnitude Of RRc Variables From Statistical Parallaxen_US
dc.typeArticleen_US

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