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On the pulsation parallax of the variable star RR Lyr | | G. Bono
; F. Caputo
; V. Castellani
; M. Marconi
; J. Storm
; | | Date: |
15 Apr 2002 | | Journal: | Mon.Not.Roy.Astron.Soc. 332 (2002) L78 | | Subject: | astro-ph | | Affiliation: | INAF - Astron. Obs. of Roma), V. Castellani (INFN - Sezione di Ferrara), M. Marconi (INAF - Astron. Obs. of Capodimonte), J. Storm (Astrophysikalisches Institut Potsdam | | Abstract: | We show that a straightforward application of the predicted relation connecting the absolute K magnitude of fundamental RR Lyrae variables to their period and metal content, together with current evolutionary predictions on the mass and luminosity of Horizontal Branch stars, supply a distance estimate to the prototype star RR Lyr in close agreement with the recent parallax determination by HST (Benedict et al. 2002), largely unaffected by the interstellar extinction correction. Adopting =0.12+-0.10 mag as a safe estimate of the extinction correction to RR Lyr, we obtain a "pulsation" parallax of 3.858+-0.131 mas which agrees quite well, and with a smaller formal error, with the HST measurement (3.82+-0.20 mas) and with the weighted average of HST, Hipparcos, and ground-based determinations (3.87+-0.19 mas). This result suggests that near-infrared magnitudes and pulsation models could constrain the distance to well-studied RR Lyrae stars, both in the field and in globular clusters, with an accuracy better than current direct trigonometric measurements. | | Source: | arXiv, astro-ph/0204243 | | Services: | Forum | Review | PDF | Favorites | |
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