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Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes | | G. Fritz Benedict
; Barbara E. McArthur
; Michael W. Feast
; Thomas G. Barnes
; Thomas E. Harrison
; Jacob L. Bean
; John W. Menzies
; Brian Chaboyer
; Luca Fossati
; Nicole Nesvacil
; Horace A. Smith
; Katrien Kolenberg
; C. D. Laney
; Oleg Kochukhov
; Edmund P. Nelan
; D. V. Shulyak
; Denise Taylor
; Wendy L. Freedman
; | | Date: |
26 Sep 2011 | | Abstract: | We present new absolute trigonometric parallaxes and proper motions for seven
Pop II variable stars: five RR Lyr variables; RZ Cep, XZ Cyg, SU Dra, RR Lyr,
UV Oct; and two type 2 Cepheids; VY Pyx and {kappa} Pav. We obtained these
results with astrometric data from Fine Guidance Sensors, white-light interfer-
ometers on Hubble Space Telescope. We find absolute parallaxes in milliseconds
of arc: RZ Cep, 2.12pm0.16 mas; XZ Cyg, 1.67pm0.17 mas; SU Dra, 1.42pm0.16
mas; RR Lyr, 3.77pm0.13 mas; UV Oct, 1.71pm0.10 mas; VY Pyx, 6.44pm0.23 mas;
and {kappa} Pav, 5.57pm0.28 mas; an average {sigma}{pi}/{pi} = 5.4%. With
these parallaxes we compute absolute magnitudes in V and K bandpasses corrected
for interstellar extinction and Lutz-Kelker-Hanson bias. Using these RRL
absolute magnitudes, we then derive zero-points for MV -[Fe/H] and MK
-[Fe/H]-Log P relations. The technique of reduced parallaxes corroborates these
results. We employ our new results to determine distances and ages of several
Galactic globular clusters and the dis- tance of the LMC. The latter is close
to that previously derived from Classical Cepheids uncorrected for any
metallicity effect, indicating that any such effect is small. We also discuss
the somewhat puzzling results obtained for our two type 2 Cepheids. | | Source: | arXiv, 1109.5631 | | Services: | Forum | Review | PDF | Favorites | |
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