RVs of RGs with suspected massive companions : J/AJ/157/136

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Authors : Makarov V.V. orcid , Tokovinin A. (hide) , Tokovinin A. et..al

VizieR DOI : 10.26093/cds/vizier.51570136
Bibcode : 2019AJ....157..136M (ADS) (Simbad) (Objects)
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CDS Keywords : Binaries, spectroscopic; Stars, giant; Radial velocities
UAT : Spectroscopic binary stars, Giant stars, Radial velocity

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Inserted into VizieR : 05-Jul-2019
Last modification : 26-Jul-2019

Observations of red giants with suspected massive companions. (2019)

Keywords : binaries spectroscopic

Abstract:Motivated by the existence of binary systems where a stellar-mass black hole is bound to a normal star, we selected four red giants with large radial velocity (RV) variation from the survey of Space Interferometry Mission (SIM) grid stars and monitored their RVs for several months. None turned out to contain a massive companion above 2.5 solar masses. The red giant TYC 9299-1080-1 with a large RV and a large proper motion is a single-lined spectroscopic binary with a period of 81 days. It is an extreme halo object moving at 350 km/s almost directly toward the Galactic center. HD 206092 is a double-lined binary with a short period of 4.37 days. It belongs to the rare class of active RS CVn-type binaries with evolved primary components, apparently undergoing mass transfer. ...(more)
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The observations reported here were conducted at the 1.5 m telescope located at Cerro Tololo (Chile) and operated by the SMARTS consortium. Ten hours of observing time were allocated through the National Optical Astronomy Observatory (NOAO). Spectra were taken by the telescope operator in the service mode. The optical echelle spectrometer CHIRON (Tokovinin et al. 2013PASP..125.1336T) was used in the fiber mode with a spectral resolution of 30000. On each visit, a single five-minute exposure of the star was taken, accompanied by the spectrum of the comparison lamp for wavelength calibration. The RVs are derived from the reduced spectra by cross-correlation with a binary mask based on the solar spectrum, similarly to the CORALIE RVs. We used 39 echelle orders in the spectral range from 4500 to 6500 {AA}, which is relatively less contaminated by telluric lines. More details are provided by Tokovinin (2016, J/AJ/152/11).

  • I/259 : The Tycho-2 Catalogue (Hog+ 2000)
  • I/345 : Gaia DR2 (Gaia Collaboration, 2018)
  • J/AJ/152/11 : Orbits of four triple stars (Tokovinin, 2016)

                


                

                    

                


                

                    

                


                

                    
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