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    The Absolute Magnitude Of RRc Variables From Statistical Parallax

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    Date
    2013-09
    Author
    Kollmeier, Juna A.
    Szczygiel, Dorota M.
    Burns, Christopher R.
    Gould, Andrew
    Thompson, Ian B.
    Preston, George W.
    Sneden, Christopher
    Crane, Jeffrey D.
    Dong, Subo
    Madore, Barry F.
    Morrell, Nidia
    Prieto, Jose L.
    Shectman, Stephen
    Simon, Joshua D.
    Villanueva, Edward
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    Abstract
    We 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.
    Department
    Astronomy
    Subject
    distance scale
    galaxy: fundamental parameters
    galaxy: kinematics and
    dynamics
    galaxy: structure
    stars: distances
    stars: variables: rr
    lyrae
    metal-poor stars
    maximum-likelihood technique
    fundamental distance
    scale
    lyrae stars
    proper motions
    key project
    kinematics
    catalog
    systematics
    metallicities
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35225
    Citation
    Kollmeier, 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.
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