- ID:
- ivo://CDS.VizieR/J/ApJS/152/103
- Title:
- Proper-motion catalog SDSS + USNO-B
- Short Name:
- J/ApJS/152/103
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of ~390000 stars with proper motions {mu}>=20mas/yr and magnitudes r'<=20, drawn from the intersection of the SDSS Data Release One (see http://www.sdss.org/dr1) and USNO-B (<I/284>). We first use SDSS quasars to correct the proper motions in each of the two source catalogs, finding that these corrections for systematics are comparable to the statistical errors. The combined proper motions have errors of {sigma}{mu}=3.9mas/yr, significantly better than any previous catalog at these magnitudes. While cross-correlating SDSS and USNO-B removes the vast majority of the very large number of spurious proper-motion stars in each, some contamination remains, especially at faint magnitudes, r'>~19.5, and high proper motions. We present a diagrammatic method to estimate the level of contamination in selected subsets of the catalog, which should be useful for choosing appropriate selection criteria for various applications.
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- ID:
- ivo://CDS.VizieR/J/A+A/632/A116
- Title:
- Proper motion catalogue of Galactic Centre
- Short Name:
- J/A+A/632/A116
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Proper motion studies of stars in the centre of the Milky Way have typically been limited to the Arches and Quintuplet clusters, and to the central parsec. Here we present the first results of a large-scale proper motion study of stars within several tens of parsecs of Sagittarius A* based on our 0.2" angular resolution GALACTICNUCLEUS survey (epoch 2015) combined with NICMOS/HST data from the Paschen-alpha survey (epoch 2008). This comprises the first extensive proper motion study of the central ~36'x16' of the Galaxy, which is not covered adequately by any of the existing astronomical surveys, such as Gaia, because of the extreme interstellar extinction(AV>~30mag). Proper motions can help us to disentangle the different stellar populations along the line-of-sight and interpret their properties in combination with multi-wavelength photometry from GALACTICNUCLEUS and other sources. It also allows us to infer the dynamics and interrelationships between different stellar components (Galactic bulge, nuclear stellar disk, nuclear stellar cluster) of the Galactic centre (GC). In particular, we use proper motions to detect co-moving groups of stars which are able to trace low-mass or partially-dissolved young clusters in the GC that can hardly be discovered by any other means. Our pilot study for this work is based on a field in the nuclear bulge associated with Hii regions that show the presence of young stars. We have detected the first group of co-moving stars coincident with an HII region. Using colour-magnitude diagrams, we have inferred that the co-moving stars are consistent with the post-main sequence stars with ages of few Myr. Simulations show that this group of stars is a real group that can indicate the existence of a dissolving or low-to-intermediate-mass young cluster. A census of these undiscovered clusters will ultimately help us to constrain star formation at the GC in the past few ten Myr.
- ID:
- ivo://CDS.VizieR/J/A+AS/145/223
- Title:
- Proper motion data of M10
- Short Name:
- J/A+AS/145/223
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first proper motion study of M10 (NGC 6254). Absolute proper motions of about 532 stars in the field of the globular cluster M10 were determined with respect to Hipparcos and ACT reference stars. In addition to photographic plates of Bonn and Shanghai also wide field CCD observations as second epoch plates were used. The wide field CCD observations show an accuracy comparable to that of the photographic plates. A good coincidence of the solutions based on reference stars from Hipparcos and from ACT was found. Our final proper motions allow a sufficient separation of cluster and field stars. Two population II Cepheids were confirmed to be members of M10. The absolute proper motion of M10 was determined and combined with its distance from the Sun and its radial velocity. The space motion and metallicity of M10 indicates the characteristics of a halo object with an orbit reaching to a maximal z-distance of less than 3kpc.
- ID:
- ivo://CDS.VizieR/J/AJ/129/2420
- Title:
- Proper motion derivatives of binaries
- Short Name:
- J/AJ/129/2420
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Useful constraints on the orbits and mass ratios of astrometric binaries in the Hipparcos catalog are derived from the measured proper motion differences of Hipparcos and Tycho-2 ({Delta}{mu}), accelerations of proper motions (d{mu}/dt) and second derivatives of proper motions (d^2^{mu}/dt^2^). It is shown how, in some cases, statistical bounds can be estimated for the masses of the secondary components. Two catalogs of astrometric binaries are generated, one of binaries with significant proper motion differences and the other of binaries with significant accelerations of their proper motions.
495. Proper motion in M34
- ID:
- ivo://CDS.VizieR/J/AJ/111/1193
- Title:
- Proper motion in M34
- Short Name:
- J/AJ/111/1193
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have measured proper motions, positions, magnitudes, and colors for 630 stars to V~16.2 in the vicinity of the open cluster NGC 1039=M34. A proper motion membership probability analysis has been performed. We give for all stars the equatorial coordinates, the proper motions, the V magnitude, and the membership probability. For the most likely cluster members we also give B-V and (V-I)K colors. Cross identifications with previous surveys are also provided. We find an age for the cluster of 200-250Myr and a distance of 475parsecs.
- ID:
- ivo://CDS.VizieR/J/A+AS/142/369
- Title:
- Proper motion LTT stars -5<DE<-30, 13h30<RA<24
- Short Name:
- J/A+AS/142/369
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This table presents relative proper motions and positions for 166 Luyten Catalogue stars re-discovered as a result of search for high proper motion stars in the southern hemisphere, being carried out with the Maksutov Astrograph at the Estacion astronomica de Cerro el Roble (Chile).
- ID:
- ivo://CDS.VizieR/J/A+AS/128/457
- Title:
- Proper motion LTT stars -5<DE<-30, 0<RA<13h30
- Short Name:
- J/A+AS/128/457
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Data are given for 353 LTT stars found on 42 areas, covering 25 square degrees each, with declination between -5{deg} and -30{deg} and right ascension between 0h and 13h 30m. Nineteen stars present differences in proper motion >=0.10", twenty present differences in position angle >=20{deg} and six present those differences in both values.
- ID:
- ivo://CDS.VizieR/J/AJ/121/1192
- Title:
- Proper-motion measurements with the VLA
- Short Name:
- J/AJ/121/1192
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The pulsar velocity distribution provides information about the binary history of pulsar progenitors, as well as the asymmetries of the supernova events in which pulsars are born. Studies of local pulsars present a biased view of this distribution, because they preferentially select low-velocity pulsars that have remained near their birthplaces in the Galactic plane. Using the VLA, we have studied the proper motions of a large sample of distant pulsars. These pulsars are generally faint, and the expected proper motions are small. In this paper, we describe the data analysis techniques that we have developed to allow precise astrometric measurements of faint sources with the VLA. These techniques include "gating" the VLA correlator to increase the signal-to-noise ratio of the pulsar by gathering data only during the pulse. Wide-field imaging techniques, including multiband imaging to account for bandwidth smearing, were used to allow identification of multiple in-beam background sources for astrometric calibration. We present the analysis of three pulsars and demonstrate that astrometric accuracy of about 10 mas can be obtained for individual sources with our technique, allowing measurement of proper motions with errors of only a few milliarcseconds per year over our 7 year baseline.
- ID:
- ivo://CDS.VizieR/J/AJ/149/42
- Title:
- Proper motion of Draco dwarf galaxy from HST
- Short Name:
- J/AJ/149/42
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have measured the proper motion of the Draco dwarf galaxy using images at two epochs with a time baseline of about two years taken with the Hubble Space Telescope Advanced Camera for Surveys. Wide Field Channels 1 and 2 provide two adjacent fields, each containing a known QSO. The zero point for the proper motion is determined using both background galaxies and the QSOs and the two methods produce consistent measurements within each field. Averaging the results from the two fields gives a proper motion in the equatorial coordinate system of ({mu}_{alpha}_,{mu}_{delta}_)=(-17.7+/-6.3,-22.1+/-6.3)mas/century and in the Galactic coordinate system of ({mu}_l_,{mu}_b_)=(-23.1+/-6.3,-16.3+/-6.3)mas/century. Removing the contributions of the motion of the Sun and of the LSR to the measured proper motion yields a Galactic rest-frame proper motion of ({mu}_{alpha}_^Grf^,({mu}_{delta}_^Grf^)=(51.4+/-6.3,-18.7+/-6.3)mas/century and ({mu}_l_^Grf^,({mu}_b_^Grf^)=(-21.8+/-6.3,-50.1+/-6.3)mas/century. The implied space velocity with respect to the Galactic center is ({Pi},{Theta},Z)=27+/-14,89+/-25,-212+/-20)km/s. This velocity implies that the orbital inclination is 70{deg}, with a 95% confidence interval of (59{deg},80{deg}), and that the plane of the orbit is consistent with that of the vast polar structure (VPOS) of Galactic satellite galaxies.
- ID:
- ivo://CDS.VizieR/J/A+AS/92/449
- Title:
- Proper-motion of LTT stars
- Short Name:
- J/A+AS/92/449
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Data are given for 205 LTT stars found on 23 areas, covering 25 square degrees each, south of declination -40D and right ascension between 04h 30m and 16h 00m. Four stars present differences in proper motion >=0.10", three present differences in position angle >20deg and one presents those differences in both values.
