Velocities and light curves of V350 Sgr : J/AJ/142/87

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Authors : Evans N.R. orcid , Berdnikov L., Gorynya N. (hide) , Berdnikov L., Gorynya N. et..al

VizieR DOI : 10.26093/cds/vizier.51420087
Bibcode : 2011AJ....142...87E (ADS) (Simbad) (Objects)
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CDS Keywords : Binaries, spectroscopic; Radial velocities; Photometry
UAT : Spectroscopic binary stars, Radial velocity, Photometry

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Inserted into VizieR : 18-Jan-2013
Last modification : 20-Jun-2017

The orbit of the Cepheid V350 Sgr revisited. (2011)

Keywords : binaries spectroscopic - stars: massive - stars: variables: Cepheids

Abstract:"The Cepheid Mass Problem" is one of the fundamental tests of the understanding of stellar evolution. One of the foundations of measured masses for Cepheids for this question is binary orbits. V350 Sgr is a classical Cepheid in a binary system. New radial velocity data for the system have been obtained over the last several years, and are used to update the orbit. The secondary in the system has previously had its orbital velocity amplitude measured in the ultraviolet with the Hubble Space Telescope. This amplitude has been combined with the new orbit and the adopted mass of the secondary resulting in a Cepheid mass of 5.0+/-0.8M_{sun}_. ...(more)
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American Astronomical Society policies
We have collected two extensive new sets of radial velocities at Tennessee State University and Moscow University and added to them some other recent data from the literature. These new data provide an improved orbital solution, particularly the amplitude, which is the crucial quantity for mass determination. Eaton obtained high-dispersion spectra of V350 Sgr covering five years (2005 February to 2009 October) with the Tennessee State University 2m Automatic Spectroscopic Telescope (AST). New data have also been obtained by the Moscow University radial velocity program. The measurements are made with a CORAVEL-type spectrometer from 1987 to 2010. 


                


                

                    

                


                

                    

                


                

                    
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