Parallax of RR Lyrae

Details Parallax of RR Lyrae Parallax of RR Lyrae

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6264j&link_type=abstract

HST Proposal ID #6264

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #6264 Stellar Populations

Scientific paper

RR Lyrae is the prototype of a class of stars that provide a fundamental steppingstone for the astronomical distance scale. Its trigonometric parallax is presently known to be around 0.0042 +/- 0.0019 arcsec for a distance modulus of 6.86 +/- 0.6 mag. It is the only star of this class with parallax range of HST. HST observations have the potential to reduce the parallax uncertainty to about 0.0005 arcsec.

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