A spectrophotometric parallax for U Geminorum

Details A spectrophotometric parallax for U Geminorum A spectrophotometric parallax for U Geminorum

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..562w&link_type=abstract

Astronomical Journal, vol. 84, Apr. 1979, p. 562-566.

Astronomy and Astrophysics

Astronomy

62

Binary Stars, Novae, Parallax, Stellar Spectrophotometry, White Dwarf Stars, Distance, Light Curve, M Stars, Main Sequence Stars, Mass Ratios, Spectral Energy Distribution, Stellar Evolution, Stellar Temperature

Scientific paper

Spectrophotometry of U Geminorum from 3200 to 10,900 A shows an upturn in flux for wavelengths longward of 6000 A. The energy distribution can be interpreted as the sum of fluxes from an M4.5 or M5 star and a source giving a flat continuum. The presence of an M star is confirmed by a higher-resolution spectrum in the red and near-infrared and by the work of Stauffer, Spinrad, and Thorstensen (1978). The M companion is less dense than a main-sequence star of the same color index. The absolute photometry allows a distance modulus of 4.4 + or 0.4 mag to be derived for U Geminorum. The absolute visual magnitude of the quiescent system at orbital phase 0.08 is 10.3 + or - 0.8.

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