Confirmation of previous ground-based Cepheid P-L zero-points using HIPPARCOS trigonometric parallaxes

Details Confirmation of previous ground-based Cepheid P-L zero-points using HIPPARCOS trigonometric parallaxes Confirmation of previous ground-based Cepheid P-L zero-points using HIPPARCOS trigonometric parallaxes

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293l..23s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 293, p. L23-L26

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21

Hipparcos Satellite, Cepheid Variables, Stellar Parallax, Light Curve, Hubble Constant, Distance, Calibrating

Scientific paper

Comparisons show agreement at the 0.1-mag level between the calibration of the Cepheid period-luminosity (P-L) relation by Feast and Catchpole (FC) (1997) using the early release of Hipparcos data and four previous ground-based calibrations, three of which are either largely or totally independent of the distance to the LMC. Each of the comparisons has the sense that the FC calibration is brighter, but only at the level of less than about 0.1 mag. In contrast, FC argue that their Hipparcos recalibration leads to a 0.2-mag revision in the distance to the LMC, and thereby to a 10 percent decrease in the Hubble constant. We argue differently. The comparison of the Hipparcos recalibration with others should be made using only local Galactic Cepheids, not based on Cepheids in the LMC that require a set of precepts that are not germane to the direct Hipparcos recalibration. The comparison made here, using only Galactic Cepheids, gives a correction of about 4 percent or less to our value of H0 based on Type Ia supernovae, keeping all other factors and precepts the same.

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