Finsen 342 and the Hyades distance modulus

Details Finsen 342 and the Hyades distance modulus Finsen 342 and the Hyades distance modulus

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..286p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 286-295.

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20

Binary Stars, Distance, Lunar Occultation, Mass To Light Ratios, Stellar Orbits, Astronomical Spectroscopy, Interferometry, Least Squares Method, Periodic Variations, Stellar Mass

Scientific paper

Visual, interferometric, and lunar-occultation observations of the close Hyades binary Phi 342 are rediscussed, and it is shown that they are equally satisfied by a 6-yr period. Spectroscopic evidence is presented that this period is to be preferred to the 13-yr period originally obtained by Finsen (1978). This removes a longstanding difficulty with the masses inferred for this system, increasing them fourfold. McClure's 1982 analysis of the distance to the Hyades, based on forcing the visual binaries to the mass-luminosity relation anchored by HD 27130, is reconsidered. The revised orbital parameters for Phi 342 lower the distance modulus 0.05 mag from that obtained by McClure. A reanalysis of the spectroscopic data and better photometric data for vB 22, and the use of a steeper mass-luminosity relation, combine to reduce the estimated modulus an additional 0.06 mag, yielding a current best estimate of 3.36 + or - 0.05 mag. Considering the scatter remaining in the visual binary fit, it may yet be possible to reconcile distances based on the visual binaries with the various other fundamental distance estimates to the Hyades.

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