Key points are not available for this paper at this time.
Trigonometric parallaxes for stars in the regions of the variable stars delta Cephei and EV Lacertae are derived from data collected with the Multichannel Astrometric Photometry (MAP) and the Thaw Refractor of the University of Pittsburgh's Allegheny Observatory. The weighted mean parallax of all trigonometric studies of delta Cephei is now +0.0030" ± 0.00093", corresponding to a distance modulus of 7.61 ± -0.67 magnitudes. This indicates that this luminosity standard star is approximately one standard deviation more distant than has been generally accepted. The weighted mean trigonometric parallax of all studies of the variable star EV Lacertae (BD +43 degrees4305) is 0.1993" ± -0.00093", implying a distance modulus of -1.498 ± -0.010 mag. The calculated absolute magnitude of this star is almost exactly that predicted by its (R-I)Kron magnitude and by the Gliese (R-I) main-sequence value for stars in the solar neighborhood. We also find a parallax of 0.0189 ± 0.0008 for the F0 IVn star, HR 8666 (BD +43degrees4300). The diverted luminosity of this star is midway between that expected for luminosity class IV and V stars at the indicated temperature.
Gatewood et al. (Fri,) studied this question.