- ID:
- ivo://CDS.VizieR/J/A+A/516/A3
- Title:
- Proper motions of PM2000 open clusters
- Short Name:
- J/A+A/516/A3
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present lists of proper-motions and kinematic membership probabilities in the region of 49 open clusters or possible open clusters. The stellar proper motions were taken from the Bordeaux PM2000 catalogue. The segregation between cluster and field stars and the assignment of membership probabilities was accomplished by applying a fully automated method based on parametrisations for the probability distribution functions and genetic algorithm optimisation heuristics associated with a derivative-based hill climbing algorithm for the likelihood optimization.
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- ID:
- ivo://CDS.VizieR/J/A+A/361/1143
- Title:
- Proper motions of PMS stars
- Short Name:
- J/A+A/361/1143
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present proper motion measurements of pre-main sequence (PMS) stars associated with major star-forming regions of the southern hemisphere (Chamaeleon, Lupus, Upper Scorpius - Ophiuchus, Corona Australis), situated in the galactic longitude range l=290{deg} to l=360{deg}. A list of PMS stars as complete as possible was established based on the Herbig and Bell (1988LicOB1111....1H) catalogue and many new catalogues like the PDS survey, the catalogue of Herbig Ae/Be stars by The et al. (1994A&AS..104..315T), X-rays surveys, etc. The measurements made use of public material (mainly AC2000 and USNO-A2.0 catalogues) as well as scans of SERC-J Schmidt plates with the MAMA measuring machine (Paris) and Valinhos CCD meridian circle observations (Brazil). We derived proper motions for 213 stars, with an accuracy of 5 to 10mas/yr depending mainly on the difference of epochs between the position sources. The main characteristics of the sample are discussed. We show that systematic motions of groups of stars exist, which are not explained by the reflex solar motion.
- ID:
- ivo://CDS.VizieR/J/MNRAS/362/1189
- Title:
- Proper motions of 74 pulsars
- Short Name:
- J/MNRAS/362/1189
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have measured the positions of 74 pulsars from regular timing observations using the Nanshan radio telescope at Urumqi Observatory between 2000 January and 2004 August (MJD 5150053240). Proper motions were determined for these pulsars by comparing their current positions with positions given in pulsar catalogues. We compare our results to earlier measurements in the literature and show that, in general, the values agree. New or improved proper motions are obtained for 16 pulsars. The effect of period fluctuations and other timing noise on the determination of pulsar positions is investigated. For our sample, the mean and rms transverse velocities are 443 and 224km/s, respectively, agreeing with previous work even though we determine distances using the new NE2001 electron density model.
- ID:
- ivo://CDS.VizieR/J/MNRAS/360/974
- Title:
- Proper motionsof pulsars
- Short Name:
- J/MNRAS/360/974
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present and analyse a catalogue of 233 pulsars with proper motion measurements. The sample contains a wide variety of pulsars including recycled objects and those associated with globular clusters or supernova remnants. After taking the most precise proper motions for those pulsars for which multiple measurements are available, the majority of the proper motions (58 per cent) are derived from pulsar timing methods, 41% using interferometers and the remaining 1% using optical telescopes.
- ID:
- ivo://CDS.VizieR/J/A+A/529/A91
- Title:
- Proper motions of 555 quasars from VLBI
- Short Name:
- J/A+A/529/A91
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- While analyzing decades of very long baseline interferometry (VLBI) data, we detected the secular aberration drift of the extragalactic radio source proper motions caused by the rotation of the Solar System barycenter around the Galactic center. Our results agree with the predicted estimate to be 4-6 micro arcseconds per year (uas/yr) towards RA=266{deg} and DE=-29{deg}. In addition, we tried to detect the quadrupole systematics of the velocity field. The analysis method consisted of three steps. First, we analyzed geodetic and astrometric VLBI data to produce radio source coordinate time series. Second, we fitted proper motions of 555 sources with long observational histories over the period 1990-2010 to their respective coordinate time series. Finally, we fitted vector spherical harmonic components of degrees 1 and 2 to the proper motion field.
- ID:
- ivo://CDS.VizieR/J/A+AS/118/503
- Title:
- Proper motions of stars in Ori Nebula
- Short Name:
- J/A+AS/118/503
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Relative proper motions and membership probabilities for 333 stars within an area of 1.6deg by 1.8deg centred on the Orion Nebula M 42 are determined using plates taken over a period of 83 years with the double astrograph of Shanghai Observatory (scale of 30"/mm). The plates were measured with the ASTROSCAN automatic plate-measuring machine of Leiden Observatory. The average proper motion accuracy obtained for stars in the photographic magnitude range 7 to 14 is 0.3mas/yr. Errors are somewhat larger towards fainter and brighter magnitude, but the majority lie well below 1mas/yr. 64% of the stars have been measured successfully on at least 13 out of 18 plates. The number of stars with membership probabilities higher than 0.7 is 184. It is shown by a detailed discussion that the proper motions and membership probabilities of the stars determined in this paper are in good agreement with the results presented recently by other authors. Although there is a clear concentration in the proper motion diagram, both the remaining dispersion of the internal motions and the distribution of "members" as projected on the sky indicate that the stars in this region are not bound as one system, but do have a common origin. A similar conclusion can be drawn from a comparison with spectroscopic and radial velocity data.
- ID:
- ivo://CDS.VizieR/J/A+A/502/91
- Title:
- Proper motions of stars near SgrA*
- Short Name:
- J/A+A/502/91
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We used multi-epoch adaptive optics assisted near-infrared observations of the central parsec of the Galaxy obtained with NACO/CONICA at the ESO VLT. Stellar positions were measured via PSF fitting in the individual images and transformed into a common reference frame via suitable sets of reference stars. We measured the proper motions of more than 6000 stars within about 1pc projected distance of the supermassive black hole Sagittarius A*. The table contains for each measured star its projected distance from Sagittarius A*, its offsets in right ascension and declination from Sagittarius A* along with the corresponding uncertainties, its proper motion and the corresponding uncertainty in right ascension and declination, the Ks-band magnitude and the corresponding uncertainty, and its classification as early type in case such a classification exists.
- ID:
- ivo://CDS.VizieR/J/A+A/556/A144
- Title:
- Proper motions of young stars in Chamaeleon
- Short Name:
- J/A+A/556/A144
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a search for new candidate members of the Chamaeleon I and II star forming regions based on proper motions and multiwavelength photometry. Kinematic candidate members are initially selected in an area of 3 degrees around each cloud on the basis of proper motions and colours using the UCAC4 catalogue. The SEDs of the objects are constructed using photometry retrieved from the Virtual Observatory and other resources, and fitted to models of stellar photospheres in order to derive effective temperatures, gravity values and luminosities. Masses and ages are estimated by comparison with theoretical evolutionary tracks in a Hertzprung-Russell diagram. Objects with ages <=20Myr are selected as probable members of the moving groups. The properties of our candidates are compared with those of the previously known members of the clouds.
- ID:
- ivo://CDS.VizieR/J/A+A/367/725
- Title:
- Proper-motion stars -40<DE<-30, 00<RA<10h40
- Short Name:
- J/A+A/367/725
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Proper motions, positions, finding charts and magnitudes are given for 147 newly discovered stars with proper motions larger than 0.15 arcsec/year. They were found in a search for high proper motion stars carried out in thirteen 5{deg}x5{deg} areas, located between -30{deg} and -40{deg} in declination, and 00h and 10h 40m in right ascension. Their blue photographic magnitudes range from approximately 9.0 to 18.5. Nine objects from the above sample have proper motions larger than 0.4 (0.404 to 0.550) arcsec/year. The same type of data is also presented for 149 Luyten Catalogue (LTT, Luyten, 1957) stars re-discovered during the above search. An estimated precision level between 6 and 22mas/year was achieved for the proper motions.
- ID:
- ivo://CDS.VizieR/J/AJ/107/2240
- Title:
- Proper motion stars survey. XII.
- Short Name:
- J/AJ/107/2240
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report new photometry and radial velocities for almost 500 stars from the Lowell Proper Motion Catalog. We combine these results with our prior sample and rederive stellar temperatures based on the photometry, reddening, metallicities (using Chi^2 matching of our 22,500 low S/N high resolution echelle spectra with a grid of synthetic spectra), distances, space motions, and Galactic orbital parameters for 1269 (kinematics) and 1261 (metallicity) of the 1464 stars in the complete survey. The frequency of spectroscopic binaries for the metal-poor ([m/H]<=-1.2) stars with periods shorter than 3000 days is at least 15%. The spectroscopic binary frequency for metal-rich stars ([m/H]>-0.5) appears to be lower, about 9%, but this may be a selection effect. We also discuss special classes of stars, including treatment of the double-lined spectroscopic binaries, and identification of subgiants. Four possible new members of the class of field blue stragglers are noted. We point out the detection of three possible new white dwarfs, six broad-lined (binary) systems, and discuss briefly the three already known nitrogen-rich halo dwarfs.
