The Mass Ratio of Upsilon-Sagittarii from Ultraviolet Radial Velocities

Details The Mass Ratio of Upsilon-Sagittarii from Ultraviolet Radial Velocities The Mass Ratio of Upsilon-Sagittarii from Ultraviolet Radial Velocities

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..400d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 247, NO. 3/DEC1, P. 400, 1990

Astronomy and Astrophysics

Astronomy

25

Scientific paper

The first positive determination of the secondary orbit of the hydrogen-deficient binary υ Sgr has been achieved by the application of cross-correlation methods to high-resolution ultraviolet (UV) spectra obtained with IUE. The mass ratio thus obtained (q = 0.63±0.01) and the consequent minimum mass for the primary (Mp sin3i/Msun=2.52±0.05) indicate that υ Sgr is a strong candidate as a progenitor of a type Ib supernova.

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