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2008MNRAS.386.2115F - Mon. Not. R. Astron. Soc., 386, 2115-2134 (2008/June-1)
The luminosities and distance scales of type II Cepheid and RR Lyrae variables.
FEAST M.W., LANEY C.D., KINMAN T.D., VAN LEEUWEN F. and WHITELOCK P.A.
Abstract (from CDS):
The MV of RR Lyrae itself is 0.16±0.12 mag brighter than predicted from an MV-[Fe/H] relation based on RR Lyrae stars in the Large Magellanic Cloud (LMC) at a modulus of 18.39±0.05 as found from classical Cepheids. This is consistent with the prediction of Catelan & Cortés that it is overluminous for its metallicity. The results for the metal- and carbon-rich Galactic disc stars, V553 Cen and SW Tau, each with small internal errors (±0.08 mag) have a mean deviation of only 0.02 mag from the period-luminosity (PL) relation established by Matsunaga et al. for type II Cepheids in globular clusters and with a zero-point based on the same LMC-scale. Comparing directly the luminosities of these two stars with published data on type II Cepheids in the LMC and in the Galactic bulge leads to an LMC modulus of 18.37±0.09 and a distance to the Galactic Centre of R0= 7.64±0.21kpc. The data for VY Pyx agree with these results within the uncertainties set by its parallax. Evidence is presented that κ Pav may have a close companion and possible implications of this are discussed. If the pulsational parallax of this star is incorporated in the analyses, the distance scales just discussed will be increased by ∼0.15±0.15 mag. V553 Cen and SW Tau show that at optical wavelengths PL relations are wider for field stars than for those in globular clusters. This is probably due to a narrower range of masses in the latter case.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): stars: distances - Cepheids - Magellanic Clouds - distance scale
VizieR on-line data: <Available at CDS (J/MNRAS/386/2115): table1.dat list.dat tablea1.dat>
Simbad objects: 164
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