- 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.
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502. 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.
- ID:
- ivo://CDS.VizieR/J/A+AS/110/27
- Title:
- Proper motion of LTT stars
- Short Name:
- J/A+AS/110/27
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Data are given for 285 LTT stars found on 23 areas, covering 25 square degrees each, south of declination -40deg and right ascension between 16h and 24h. Four stars present differences in proper motion greater than 0.10 arcsec, eleven present differences in position angle >20deg and one presents those differences in both values.
- ID:
- ivo://CDS.VizieR/J/A+A/312/74
- Title:
- Proper motion of M 92
- Short Name:
- J/A+A/312/74
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present proper motions for stars in the field of the galactic globular cluster NGC6341 (M92). This study continues the series of papers from the Bonn programme of globular cluster proper motions. Plates taken with the Bonn double refractor and the Rozhen observatory 2m Ritchey-Chretien telescope with a maximal epoch difference of 94 years were used. Relative proper motions for all well-measurable stars in the 1.5degx1.5deg field covered by the plates were derived. Median proper motion errors are 0.8milliarcsec/year (mas/a) for stars brighter than about V=16.7mag. The cluster membership of UV-bright and variable stars is discussed. The proper motions are compared with the accurate relative proper motions of Rees (1992) and with the absolute proper motions from Schmidt plates referred to galaxies of Scholz et al. (1994). The latter comparison enables us to tie the proper motions of the stars and the mean proper motion of M92 to an inertial system. This calibration has an uncertainty of about 1.0mas/a. The absolute proper motions of Hipparcos stars in the field will be useful for the extragalactic calibration of the Hipparcos proper motion system. The data for 642 stars within 18.6' from the cluster centre is available via the CDS (Centre des Donnees Astronomiques Strasbourg) Data Centre.
- ID:
- ivo://CDS.VizieR/J/AJ/137/1
- Title:
- Proper motions and astrometry of late-type dwarfs
- Short Name:
- J/AJ/137/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report proper-motion measurements for 427 late-type M, L, and T dwarfs, 332 of which have been measured for the first time. Combining these new proper motions with previously published measurements yields a sample of 841 M7-T8 dwarfs. We combined parallax measurements or calculated spectrophotometric distances, and computed tangential velocities for the entire sample.
