On the pulsation parallax of the variable star RR Lyr

Details On the pulsation parallax of the variable star RR Lyr On the pulsation parallax of the variable star RR Lyr

2002-04-15

arxiv.org/abs/astro-ph/0204243v1

Mon.Not.Roy.Astron.Soc. 332 (2002) L78

Astronomy and Astrophysics

Astrophysics

3 pages, accepted for publication in the pink pages of MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05573.x

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.

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