- ID:
- ivo://CDS.VizieR/J/BaltA/8/325
- Title:
- Radial velocities of Pop. II stars
- Short Name:
- J/BaltA/8/325
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Population II radial velocity measurement programme was carried out in 1988-1993. Metal-deficient stars, components of Population II visual binaries or common proper motion stars, suspected radial velocity variables, Hipparcos programme stars are included into the observation programme. The measurements were made with the CORAVEL-type photoelectric radial velocity speedometer attached to the 1m reflector at the Mount Maidanak observatory (h=2560m, Uzbekistan). The average error of a single measurement is about 0.6km/s, but for the stars as faint as 13mag, or for extreme metal-deficient stars it drop down to 2.5km/s. 621 measurements for 164 stars are presented.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/354/881
- Title:
- Radial velocities of Praesepe & Hyades Am stars
- Short Name:
- J/A+A/354/881
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- CORAVEL radial-velocity observations of Am stars in the Hyades and Praesepe have allowed the determination of orbital elements for 10 spectroscopic binaries, among which 3 are first determinations. One Am star (KW 40) is found to be a well hierarchised triple system. KW 538 has a rather long period (435 days) for an Am star. Orbits of systems with periods shorter than 8.5 days are circularized, or present eccentricities smaller than 0.04. For 19 Am stars, the number of quadruple-, triple-, double-, single systems is 1:2:14(10+4?):(2?). The Am stars in a ({beta}, B-V) diagram clearly stand away by 0.03mag from the sequence defined by normal main-sequence stars. This diagram could be a powerful method to identify Am stars in more distant open clusters, provided there is no differential reddening. In the colour-magnitude diagram (M_V_, {beta}), double-lined binaries are 0.6-0.7mag above the ZAMS as expected, while most single-lined are close to or on the ZAMS because the secondary does not contribute much light. The absence of X-ray detection of 4 systems in the Hyades is an argument for the presence of a white dwarf secondary.
- ID:
- ivo://CDS.VizieR/J/AJ/161/106
- Title:
- Radial velocities of 12 Psc and HD 159062
- Short Name:
- J/AJ/161/106
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery of a white dwarf companion to the G1 V star 12Psc found as part of a Keck adaptive optics imaging survey of long-term accelerating stars from the McDonald Observatory Planet Search Program. Twenty years of precise radial-velocity monitoring of 12Psc with the Tull Spectrograph at the Harlan J. Smith telescope reveals a moderate radial acceleration (~10m/s/yr), which together with relative astrometry from Keck/NIRC2 and the astrometric acceleration between Hipparcos and Gaia DR2 yields a dynamical mass of M_B_=0.605_-0.022_^+0.021^M{sun} for 12PscB, a semimajor axis of 40_-4_^+2^au, and an eccentricity of 0.84{+/-}0.08. We also report an updated orbital fit of the white dwarf companion to the metal-poor (but barium-rich) G9 V dwarf HD159062 based on new radial velocity observations from the High-Resolution Spectrograph at the Hobby-Eberly Telescope and astrometry from Keck/NIRC2. A joint fit of the available relative astrometry, radial velocities, and tangential astrometric acceleration yields a dynamical mass of M_B_=0.609_-0.011_^+0.010^M{sun} for HD159062B, a semimajor axis of 60_-7_^+5^au, and preference for circular orbits (e<0.42 at 95% confidence). 12PscB and HD159062B join a small list of resolved Sirius-like benchmark white dwarfs with precise dynamical mass measurements which serve as valuable tests of white dwarf mass-radius cooling models and probes of AGB wind accretion onto their main-sequence companions.
- ID:
- ivo://CDS.VizieR/J/A+A/490/737
- Title:
- Radial velocities of 3 RasTyc new triple system
- Short Name:
- J/A+A/490/737
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- During the study of a large set of late-type stellar X-ray sources, we discovered a high fraction of multiple systems. In this paper we investigate the orbital elements and kinematic properties of three new spectroscopic triple systems, along with the spectral types and astrophysical parameters (T_eff_, logg, vsini, log N(Li)) of their components. We conducted follow-up optical observations of these systems, both photometric and spectroscopic ones at high resolution. We used a synthetic approach and the cross-correlation method to derive most of the stellar parameters.
- ID:
- ivo://CDS.VizieR/J/A+A/399/105
- Title:
- Radial velocities of red giants in NGC 1817
- Short Name:
- J/A+A/399/105
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Radial-velocity and BV CCD observations of 29 red-giant candidates in the central part of the intermediate-age open cluster NGC 1817 have confirmed the membership of 21 stars. In addition, we have used radial velocities and new UBVR photoelectric photometry to investigate the membership of 59 new candidates located in an outer corona surrounding NGC 1817, identified from the POSS plates. We have confirmed 18 new members out to a distance of 27' from the centre, thus doubling the previous cluster radius. Ten definite spectroscopic-binary members have been discovered, corresponding to a binary frequency of 25.6% and four orbits have been determined so far. Three additional stars have been identified as possible spectroscopic-binary members. We derive a cluster mean velocity of +65.33+/-0.09 (0.52 s.e.) km/s based on 29 members with no detected velocity variations plus the 3 binary members with orbital solutions.
- ID:
- ivo://CDS.VizieR/J/MNRAS/396/2183
- Title:
- Radial velocities of red giants in {omega} Cen
- Short Name:
- J/MNRAS/396/2183
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a survey of radial velocities over a wide region extending from r~=10 out to 80' (~1.5 tidal radii) within the massive star cluster omega Centauri (omega Cen). The survey was performed with FLAMES@VLT, to study the velocity dispersion profile in the outer regions of this stellar system. We derived accurate radial velocities for a sample of 2557 newly observed stars, identifying 318 bona fide cluster red giants. Merging our data with those provided by our previous survey, we assembled a final homogeneous sample of 946 cluster members that allowed us to trace the velocity dispersion profile from the centre out to r~32'.
- ID:
- ivo://CDS.VizieR/J/AJ/131/2514
- Title:
- Radial velocities of red giants in the SMC
- Short Name:
- J/AJ/131/2514
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a spectroscopic survey of 2079 red giant stars, distributed over the central 4kpcx2kpc of the Small Magellanic Cloud (SMC). After fitting and removing a small velocity gradient across the SMC (8.3km/s/{deg} oriented at 23.4{deg} east of north), we measure an rms velocity scatter of 27.5+/-0.5km/s.
- ID:
- ivo://CDS.VizieR/J/A+A/413/293
- Title:
- Radial velocities of RZ Cas
- Short Name:
- J/A+A/413/293
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In a first report on the results of a multi-site campaign in 2001 of photometric and spectroscopic observations of the active semi-detached Algol-type system RZ Cas, we concentrate on the radial velocity (RV) variations. Using weak absorption lines we obtain an improved orbital solution for both components. In the orbital RV curve we observe a strong, asymmetric rotation effect. For the first time we detect rapid spectroscopic multi-mode pulsations in an Algol system. Whereas the photometrically observed oscillations were dominated by monoperiodic pulsations at frequency 64.19c/d until the year 2000, we find in 2001 a multiperiodic behaviour with two dominant frequencies of f1=56.600c/d and f2=64.189c/d. Both modes show amplitude variations over the orbital phase with a minimum at orbital phases phi=0.6-0.8 and a maximum just after the primary minimum (f2) and at phi=0.25 (f1). The different shape of amplitude modulation of the f1 and f2 modes points to different (l,m) mode structures. The modulation itself can be explained by assuming a variable extinction due to gas streams and an inhomogeneous accretion annulus that weakens the light from different regions of the primary depending on its orbital position.
- ID:
- ivo://CDS.VizieR/J/A+A/498/627
- Title:
- Radial velocities of SB with M giant
- Short Name:
- J/A+A/498/627
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper is a follow-up of the vast effort to collect radial velocity data for stars belonging to the Hipparcos survey. We aim at extending the orbital data available for binaries with M giant primaries. The data will be used in the companion papers of this series to (i) derive the binary frequency among M giants and compare it to that of K giants (Paper II, Frankowski et al., 2009A&A...498..479F), and (ii) analyse the eccentricity-period diagram and the mass-function distribution (Paper III, Jorissen et al., 2009A&A...498..489J). Keplerian solutions are fitted to radial-velocity data. However, for several stars, no satisfactory solution could be found, despite the fact that the radial-velocity standard deviation is larger than the instrumental error, because M giants suffer from intrinsic radial-velocity variations due to pulsations. We show that these intrinsic radial-velocity variations can be linked with both the average spectral-line width and the photometric variability. We present an extensive collection of spectroscopic orbits for M giants, with 12 new orbits, plus 17 from the literature. Moreover, to illustrate the fact that the large radial-velocity jitter present in Mira and semi-regular variables may easily be confused with orbital variations, we also present examples of pseudo-orbital variations (in S UMa, X Cnc and possibly in HD 115521, a former IAU radial-velocity standard). Because of this difficulty, M giants involving Mira variables were excluded from our monitored sample. We finally show that the majority of M giants detected as X-ray sources are actually binaries.
- ID:
- ivo://CDS.VizieR/J/MNRAS/386/826
- Title:
- Radial velocities of SMC massive stars
- Short Name:
- J/MNRAS/386/826
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present radial velocities for 2045 stars in the Small Magellanic Cloud (SMC), obtained from the 2dF survey by Evans et al. (2004, Cat. J/MNRAS/353/601). The great majority of these stars are of OBA type, tracing the dynamics of the young stellar population. Dividing the sample into ad hoc `bar' and `wing' samples (north and south, respectively, of the line: delta=-77^{deg}50' + [4{alpha}]', where alpha is in minutes of time) we find that the velocities in the SMC bar show a gradient of 26.3+/-1.6km/s/deg at a position angle of 126+/-4deg. The derived gradient in the bar is robust to the adopted line of demarcation between the two samples. The largest redshifts are found in the SMC wing, in which the velocity distribution appears distinct from that in the bar, most likely a consequence of the interaction between the Magellanic Clouds that is predicted to have occurred 0.2Gyr ago. The mean velocity for all stars in the sample is +172.0+/-0.2km/s (redshifted by ~20km/s when compared to published results for older populations), with a velocity dispersion of 30km/s.
