Astrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR Lyrae

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dc.creatorBenedict, G. Fritz
dc.creatorMcArthur, B. E.
dc.creatorFredrick, L. W.
dc.creatorHarrison, T. E.
dc.creatorLee, J.
dc.creatorSlesnick, C. L.
dc.creatorRhee, J.
dc.creatorPatterson, R. J.
dc.creatorNelan, E.
dc.creatorJefferys, W. H.
dc.creatorvan Altena, W.
dc.creatorShelus, P. J.
dc.creatorFranz, O. G.
dc.creatorWasserman, L. H.
dc.creatorHemenway, P. D.
dc.creatorDuncombe, R. L.
dc.creatorStory, D.
dc.creatorWhipple, A. L.
dc.creatorBradley, A. J.
dc.date2001-10-11
dc.date2001-10-23
dc.date.accessioned2026-07-07T10:31:08Z
dc.date.available2026-07-07T10:31:08Z
dc.descriptionWe present an absolute parallax and relative proper motion for the fundamental distance scale calibrator, RR Lyr. We obtain these with astrometric data from FGS 3, a white-light interferometer on HST. We find $π_{abs} = 3.82 \pm 0.2$ mas. Spectral classifications and VRIJHKT$_2$M and DDO51 photometry of the astrometric reference frame surrounding RR Lyr indicate that field extinction is low along this line of sight. We estimate <A_V>=0.07\pm0.03 for these reference stars. The extinction suffered by RR Lyr becomes one of the dominant contributors to the uncertainty in its absolute magnitude. Adopting the average field absorption, <A_V>=0.07 \pm 0.03, we obtain M_V^{RR} = 0.61 ^{-0.11}_{+0.10}. This provides a distance modulus for the LMC, m-M = 18.38 - 18.53^{-0.11}_{+0.10} with the average extinction-corrected magnitude of RR Lyr variables in the LMC, <V(RR)>, remaining a significant uncertainty. We compare this result to more than 80 other determinations of the distance modulus of the LMC.
dc.descriptionSeveral typos corrected. To appear in The Astronomical Journal, January 2002
dc.identifierhttps://arxiv.org/abs/astro-ph/0110271
dc.identifierhttp://arxiv.org/abs/astro-ph/0110271
dc.identifierAstron.J.123:473-484,2002
dc.identifierdoi:10.1086/338087
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178314
dc.subjectAstrophysics
dc.titleAstrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR Lyrae
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