The nature of the dwarf Cepheid EH Librae

Details The nature of the dwarf Cepheid EH Librae The nature of the dwarf Cepheid EH Librae

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..651j&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, July 1986, p. 651-657. Research supported by Brigha

Astronomy and Astrophysics

Astronomy

15

Cepheid Variables, Dwarf Stars, Radial Velocity, Stellar Spectrophotometry, Astronomical Photometry, Astronomical Spectroscopy, Red Shift, Stellar Magnitude, Stellar Mass, Stellar Temperature

Scientific paper

Photometry (uvby beta) of EH Lib has been secured and analyzed. A small correction is made to the period in order to better predict times of light maxima. A reddening value, E(b-y) = +0.041 min is derived from standard calibrations applied to the photometry. Intrinsic (b-y) and c1 values are used to determine a mean effective temperature of 7840 K, and a mean surface gravity of 4.08. The metal abundance, Fe/H of -0.015, is determined from delta m1. Using new and previously published spectroscopic data, a mean radius of 2.4 solar radii is derived using a Wesselink method. The radius and effective temperature indicate a mean absolute bolometric magnitude, of +1.5. Also, a mass of 2.0 solar masses is derived using the radius and effective gravity. Radial-velocity data yield a mean radial velocity, gamma = -61 km/s, and a total velocity range, 2K = 35 km/s.

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