Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-13
Astronomy and Astrophysics
Astrophysics
To appear in The Astronoomical Journal, September 2002
Scientific paper
10.1086/342014
We present an absolute parallax and relative proper motion for the fundamental distance scale calibrator, delta Cep. We obtain these with astrometric data from FGS 3, a white-light interferometer on HST. Utilizing spectrophotometric estimates of the absolute parallaxes of our astrometric reference stars and constraining delta Cep and reference star HD 213307 to belong to the same association (Cep OB6, de Zeeuw et al. 1999), we find pi_{abs} = 3.66 +/- 0.15 mas. The larger than typical astrometric residuals for the nearby astrometric reference star HD 213307 are found to satisfy Keplerian motion with P = 1.07 +/- 0.02 years, a perturbation and period that could be due to a F0V companion ~7 mas distant from and ~4 magnitudes fainter than the primary. Spectral classifications and VRIJHKT$_2$M and DDO51 photometry of the astrometric reference frame surrounding delta Cep indicate that field extinction is high and variable along this line of sight. However the extinction suffered by the reference star nearest (in angular separation and distance) to delta Cep, HD 213307, is lower and nearly the same as for delta Cep. Correcting for color differences, we find
Benedict George F.
Bradley Arthur J.
Duncombe Raynor L.
Franz Otto G.
Fredrick Laurence W.
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