The non-single star content of the list of radial velocity standard stars
نویسنده
چکیده
We analyse the properties of unresolved multiple stars within the full-sky list of radial velocity standard stars, and we estimate that a low remaining fraction would have a radial velocity variation during the mission larger than the requirement. The need for supplementary observations to specifically remove these multiple stars does not appear justified. CU6 The non-single star content of the list of radial velocity standard stars GAIA-C6-TN-OPM-FA-060
منابع مشابه
Discovery of an Unbound Hyper-velocity Star in the Milky Way Halo
We have discovered a star, SDSS J090745.0+024507, leaving the Galaxy with a heliocentric radial velocity of +853± 12 km s, the largest velocity ever observed in the Milky Way halo. The star is either a hot blue horizontal branch star or a B9 main sequence star with a heliocentric distance ∼55 kpc. Corrected for the solar reflex motion and to the local standard of rest, the Galactic rest-frame v...
متن کاملThe Incidence of Stellar Mergers and Mass Gainers among Massive Stars
Because the majority of massive stars are born as members of close binary systems, populations of massive main-sequence stars contain stellar mergers and products of binary mass transfer. We simulate populations of massive stars accounting for all major binary evolution effects based on the most recent binary parameter statistics and extensively evaluate the effect of model uncertainties. Assum...
متن کاملارائه الگوریتم شناسایی ستاره بر مبنای رأیگیری هندسی به منظور استفاده در ردیابهای ستارهای
Star identification is one of the most important stages in attitude determination with star trackers. This can be performed using matching algorithms between observed stars and a master star catalogue. The main challenge in this approach is to provide a fast and reliable identification algorithm that is sufficiently robust in different pointing views of the star tracker optical system in the sp...
متن کاملInvestigation of the Praesepe Cluster Iii. Radial Velocity and Binarity of the F5-k0 Klein-wassink Stars
Coravel observations of 103 F5-K0 stars in the Praesepe cluster yielded 24 spectroscopic binaries (3 are non-members), and 20 orbits were determined, with periods from 4 to 7400 days. Based on a complete sample in the colour range 0.40 ≤ B − V ≥ 0.80 (80 stars, including KW 244 = TX Cnc), the companion star fraction CSF = 0.45. The percentage of spec-troscopic binaries with P < 1000. d is 20% (...
متن کاملar X iv : 0 71 1 . 25 05 v 1 [ as tr o - ph ] 1 5 N ov 2 00 7 Star Spot Induced Radial Velocity Variability in LkCa 19
We describe a new radial velocity survey of T Tauri stars and present the first results. Our search is motivated by an interest in detecting massive young planets, as well as investigating the origin of the brown dwarf desert. As part of this survey, we discovered large-amplitude, periodic, radial velocity variations in the spectrum of the weak line T Tauri star LkCa 19. Using line bisector ana...
متن کامل