- ID:
- ivo://CDS.VizieR/I/14
- Title:
- Proper Motions of 1160 Late-Type Stars
- Short Name:
- I/14
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Improved proper motions for the 1160 stars contained in the photometric catalog by Dickow et al. (1970A&AS....2....1D, II/38) are presented. Most of the proper motions are from the GC, transferred to the system of FK4. For stars not included in the GC, preliminary AGK or SAO proper motions are given. Olsen (1970A&AS....1..189O) describes the method of improvement. The mean errors of the centennial proper motions increase with increasing magnitude. In Right Ascension, these range from 0.0043/cos(dec) for very bright stars to 0.096/cos(dec) s for the faintest stars. In Declination, the range is from 0.065 to 1.14 arcsec.
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- ID:
- ivo://CDS.VizieR/J/ApJ/741/100
- Title:
- Proper motions of Leo II member stars
- Short Name:
- J/ApJ/741/100
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use 14 year baseline images obtained with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST) to derive a proper motion for one of the Milky Way's most distant dwarf spheroidal companions, Leo II, relative to an extragalactic background reference frame. Astrometric measurements are performed in the effective point-spread function formalism using our own developed code. An astrometric reference grid is defined using 3224 stars that are members of Leo II and brighter than a magnitude of 25 in the F814W band. We identify 17 compact extragalactic sources, for which we measure a systemic proper motion relative to this stellar reference grid. We derive a proper motion [{mu}_{alpha}_,{mu}_{delta}_]=[+104+/-113,-33+/-151]uas/yr for Leo II in the heliocentric reference frame. Though marginally detected, the proper motion yields constraints on the orbit of Leo II. Given a distance of d~230kpc and a heliocentric radial velocity v_r_=+79km/s, and after subtraction of the solar motion, our measurement indicates a total orbital motion v_G_=266.1+/-128.7km/s in the Galactocentric reference frame, with a radial component v_rG_=21.5+/-4.3km/s and tangential component v_tG_=265.2+/-129.4km/s. The small radial component indicates that Leo II either has a low-eccentricity orbit or is currently close to perigalacticon or apogalacticon distance. We see evidence for systematic errors in the astrometry of the extragalactic sources which, while close to being point sources, are slightly resolved in the HST images. We provide a detailed catalog of the stellar and extragalactic sources identified in the HST data which should provide a solid early-epoch reference for future astrometric measurements.
- ID:
- ivo://CDS.VizieR/J/AJ/119/2866
- Title:
- Proper motions of metal-poor stars
- Short Name:
- J/AJ/119/2866
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a revised catalog of 2106 Galactic stars, selected without kinematic bias and with available radial velocities, distance estimates, and metal abundances in the range -4.0<=[Fe/H]<=0.0. This update of the 1995 Beers & Sommer-Larsen catalog (Cat. <J/ApJS/96/175>) includes newly derived homogeneous photometric distance estimates, revised radial velocities for a number of stars with recently obtained high-resolution spectra, and refined metallicities for stars originally identified in the HK objective-prism survey (which account for nearly half of the catalog) based on a recent recalibration. A subset of 1258 stars in this catalog have available proper motions based on measurements obtained with the Hipparcos astrometry satellite or taken from the updated Astrographic Catalogue (second epoch positions from either the Hubble Space Telescope Guide Star Catalog or the Tycho Catalogue), the Yale/San Juan Southern Proper Motion Catalog 2.0, and the Lick Northern Proper Motion Catalog. Our present catalog includes 388 RR Lyrae variables (182 of which are newly added), 38 variables of other types, and 1680 nonvariables, with distances in the range 0.1 to 40kpc.
- ID:
- ivo://CDS.VizieR/J/MNRAS/484/2832
- Title:
- Proper motions of Milky Way globular clusters
- Short Name:
- J/MNRAS/484/2832
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use Gaia Data Release 2 to determine the mean proper motions for 150 Milky Way globular clusters (almost the entire known population), with a typical uncertainty of 0.05mas/yr limited mainly by systematic errors. Combining them with distance and line-of-sight velocity measurements from the literature, we analyse the distribution of globular clusters in the 6D phase space, using both position/velocity and action/angle coordinates. The population of clusters in the central 10kpc has a mean rotational velocity reaching 50-80km/s, and a nearly isotropic velocity dispersion 100-120km/s, while in the outer galaxy, the cluster orbits are strongly radially anisotropic. We confirm a concentration of clusters at high radial action in the outer region of the Galaxy. Finally, we explore a range of equilibrium distribution function-based models for the entire globular cluster system, and the information they provide about the potential of the Milky Way. The dynamics of clusters is best described by models with the circular velocity between 10 and 50kpc staying in the range 210-240km/s.
- ID:
- ivo://CDS.VizieR/J/ApJ/875/77
- Title:
- Proper motions of MW satellites with Gaia & DES
- Short Name:
- J/ApJ/875/77
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a new, probabilistic method for determining the systemic proper motions of Milky Way (MW) ultra-faint satellites in the Dark Energy Survey (DES). We utilize the superb photometry from the first public data release (DR1) of the DES to select candidate members and cross-match them with the proper motions from the Gaia DR2. We model the candidate members with a mixture model (satellite and MW) in spatial and proper motion space. This method does not require prior knowledge of satellite membership and can successfully determine the tangential motion of 13 DES satellites. With our method, we present measurements of the following satellites: Columba I, Eridanus III, Grus II, Phoenix II, Pictor I, Reticulum III, and Tucana IV. This is the first systemic proper motion measurement for several of these satellites, and the majority lack extensive spectroscopic follow-up studies. We compare these to the predictions of Large Magellanic Cloud satellites and the vast polar structure. With the high-precision DES photometry, we conclude that most of the newly identified member stars are very metal-poor ([Fe/H]<=-2), similar to other ultra-faint dwarf galaxies, while Reticulum III is likely more metal-rich. We also find potential members in the following satellites that might indicate their overall proper motion: Cetus II, Kim 2, and Horologium II. However, due to the small number of members in each satellite, spectroscopic follow-up observations are necessary to determine the systemic proper motion in these satellites.
- ID:
- ivo://CDS.VizieR/J/A+A/564/A79
- Title:
- Proper motions of open clusters from UCAC4
- Short Name:
- J/A+A/564/A79
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of mean proper motions and membership probabilities of individual stars for optically visible open clusters, which have been determined using data from the UCAC4 catalog in a homogeneous way. The mean proper motion of the cluster and the membership probabilities of the stars in the region of each cluster were determined by applying the statistical method in a modified fashion. In this study, we applied a global optimization procedure to fit the observed distribution of proper motions with two overlapping normal bivariate frequency functions, which also take the individual proper motion errors into account. For 724 clusters, this is the first determination of proper motion, and for the whole sample, we present results with a much larger number of identified astrometric member stars. Furthermore, it was possible to estimate the mean radial velocity of 364 clusters (102 unpublished so far) with the stellar membership using published radial velocity catalogs. These results provide an increase of 30% and 19% in the sample of open clusters with a determined mean absolute proper motion and mean radial velocity, respectively.
- ID:
- ivo://CDS.VizieR/J/AZh/80/8
- Title:
- Proper motions of open star clusters
- Short Name:
- J/AZh/80/8
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The mean proper motions of 390 galactic open clusters with radial-velocity measurements are computed from the data of the Tycho-2 catalog (<I/259>) using the kinematic and photometric cluster membership criteria.
- 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.
- 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.
