Abstract

ECHEVARRIA, Juan  and  MICHEL, Raúl. Radial velocity study of uz serpentis. Rev. mex. astron. astrofis [online]. 2007, vol.43, n.2, pp.292-296. ISSN 0185-1101.

We present high dispersion time-resolved spectroscopic observations of the dwarf nova UZ Ser. We find the radial velocity curve of the accretion disc, surrounding the primary star, with a semi-amplitude K₁ = 98 km s^-1. There is no spectral evidence of the secondary star. The orbital period, estimated from its velocity curve is 0.17589 days, slightly larger than that found by Echevarría (1988), from photometric observations. New ephemerides of the object are discussed from both results. An analysis of the masses and inclination angle of the binary, using the diagnostic M₁-M₂ diagram, favors a set of values with M₁ = 0.90 ± 0.1; M₂ = 0.40 ± 0.1; and i = 50° ± 0.1, which is consistent with the ultraviolet observations and models and also with the optical photometry.

Keywords : Binaries; close-stars; dwarf novae-individua (uz serpentis).

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