Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system

Abstract

The Pulkovo Compilation of Radial Velocities (PCRV) has been made to study the stellar kinematics in the local spiral arm. The PCRV contains weighted mean absolute radial velocities for 35 495 Hipparcos stars of various spectral types and luminosity classes over the entire celestial sphere mainly within 500 pc of the Sun. The median accuracy of the radial velocities obtained is 0.7 km s −1 . Results from 203 publications were used in the catalogue. Four of them were used to improve the radial velocities of standard stars from the IAU list. The radial velocities of 155 standard stars turned out to be constant within 0.3 km s −1 . These stars were used to analyze 47 768 mean radial velocities for 37 200 stars from 12 major publications (∼ 80% of all the data used). Zero-point discrepancies and systematic dependences on radial velocity, (B − V ) color index, right ascension, and declination were found in radial velocity differences of the form "publication minus IAU list of standards". These discrepancies and dependences were approximated and taken into account when calculating the weighted mean radial velocities. 1128 stars whose independent radial-velocity determinations were available at least in three of these publications and agreed within 3 km s −1 were chosen as the work list of secondary standards. Radial-velocity differences of the form "publication minus list of secondary standards" were used by analogy to correct the zero points and systematic dependences in the radial velocities from 33 more publications ( 13% of the data used). In addition, the radial * E-mail: georgegontcharov@yahoo.com 1 velocities from 154 minor publications (∼ 7% of the data used) pertaining to well-known instruments were used without any corrections. 2 INTRODUCTIONThe stellar kinematics in the solar neighborhood within the local spiral arm of the Galaxy is being studied at the Pulkovo Astronomical Observatory of the Russian Academy of Sciences and the Astronomical Institute of the St. Petersburg State University as part of the OSACA (Orion Spiral Arm Catalogue, http://www.geocities.com/orionspiral/) project (Gontcharov 2004). The study is based on six quantities that describe the stellar positions and velocities: α, δ, π, µ α , µ δ , and V r , as well as the coordinates X, Y , and Z and space velocities U, V , and W calculated from them in the standard Galactic rectangular coordinate system, where X, Y , and Z increase in the directions of the Galactic center, the Galactic rotation, and the Galactic North Pole, respectively.At present, the coordinates and proper motions are known for a larger number of stars and with a higher relative accuracy than the parallaxes and radial velocities. For example, the coordinates and proper motions of ∼ 96000 Hipparcos stars (ESA 1997) within 500 pc of the Sun are known with a relative accuracy higher than 10 −7 and an accuracy higher than 3 km s −1 , respectively, while the parallaxes of only ∼ 69000 Hipparcos stars are known with a relative accuracy higher than 0.3 and the radial velocities of ...

On the accuracy of close stellar approaches determination

“…According to the latest estimation of its astrometric parameters presented in HIP2 catalogue and using v r = −13.8 km s −1 (Gontcharov (2006), used also in XHIP) we obtained the proximity distance (both nominal and mean) as small as 0.29 pc. As it is clearly depicted in Fig.6 the straight linear motion approximation works very well in this case.…”

“…As it concerns radial velocity, several large projects (see for example Grenier et al 1999a,b;Nidever et al 2002;Nordström et al 2004) increased the number available measurements and a large Pulkovo compilation of radial velocities of 35 495 Hipparcos stars was published by Gontcharov (2006). Using HIP2 catalogue, Pulkovo compilation of radial velocities and several other sources of astrophysical parameters Anderson & Francis (2012) published an extended Hipparcos compilation of stellar data, known as the XHIP catalogue.…”

An astrosphere around the blue supergiant κ Cas: possible explanation of its filamentary structure

“…The proper motion measurements, µα cos δ and µ δ , are based on the new reduction of the Hipparcos data by van Leeuwen (2007). The heliocentric radial velocity of the star, v r,hel , is taken from Gontcharov (2006). Using these data, the Solar galactocentric distance R0 = 8.0 kpc and the circular Galactic rotation velocity Θ0 = 240 km s −1 (Reid et al 2009), and the solar peculiar motion (U⊙, V⊙, W⊙) = (11.1, 12.2, 7.3) km s −1 (Schönrich, Binney & Dehnen 2010), we calculated the peculiar transverse velocity Vtr = (v 2 l + v 2 b ) 1/2 , where v l and v b are, respectively, the velocity components along the Galactic longitude and latitude, the peculiar radial velocity vr, and the total space velocity V * of the star.…”

Finding the imprints of stellar encounters in long-period comets

“…A specific star may appear more than once but with different data, thus leading to a different object. As described in BJ15, we use GCS (G), RAVE (R), Pulkovo (P) to denote the catalog of objects with radial velocity obtained by crossmatching the revised Hipparcos catalog (van Leeuwen 2007) with the Geneva-Copenhagen survey data by (Casagrande et al 2011), with the Pulkovo catalogue (Gontcharov 2006), and with Rave-DR4 (Kordopatis et al 2013), respectively. We also use data from the XHIP (X) catalog (Anderson & Francis 2012) and the XHIP catalog adapted by (Dybczyński & Berski 2015) (D).…”