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551. Proper motions near the Baade window
ID:
ivo://CDS.VizieR/J/MNRAS/370/435
Title:
Proper motions near the Baade window
Short Name:
J/MNRAS/370/435
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a proper motion mini-survey of 35 fields in the vicinity of Baade window, (l, b) = (1{deg}, 4{deg}), sampling roughly a 5x2.5deg^2^ region of the Galactic bar. Our second epoch observations collected with the Advanced Camera for Surveys/High Resolution Channel instrument onboard the Hubble Space Telescope were combined with the archival Wide Field Planetary Camera 2/PC images. The resulting time baselines are in the range of 4 to 8yr. Precise proper motions of 15863 stars were determined in the reference frame defined by the mean motion of stars with magnitudes between I_F814W_=16.5 and 21.5 along the line of sight.
552. Proper motions of blue stragglers in 38 GC
ID:
ivo://CDS.VizieR/J/MNRAS/462/3401
Title:
Proper motions of blue stragglers in 38 GC
Short Name:
J/MNRAS/462/3401
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present new blue straggler star (BSS) catalogues in 38 Milky Way globular clusters (GCs) based on multipassband and multi-epoch treasury survey data from the Hubble Space Telescope. We measure precise astrometry and relative proper motions of stars in all target clusters and performed a subsequent cluster membership selection. We study the accuracy of our proper-motion measurements using estimates of central velocity dispersions and find very good agreement with previous studies in the literature. Finally, we present a homogeneous BSS selection method, that expands the classic BSS selection parameter space to more evolved BSS evolutionary stages. We apply this method to the proper-motion cleaned GC star catalogues in order to define proper-motion cleaned BSS catalogues in all 38 GCs, which we make publicly available to enable further study and follow-up observations.
553. Proper motions of cool stars in Upper Sco OB
ID:
ivo://CDS.VizieR/J/A+A/504/981
Title:
Proper motions of cool stars in Upper Sco OB
Short Name:
J/A+A/504/981
Date:
21 Oct 2021
Publisher:
CDS
Description:
Proper motion measurements of the cool and ultracool populations in the Upper Scorpius OB association are crucial to confirm membership and to identify possible run-away objects. We cross-match samples of photometrically selected and spectroscopically confirmed cool and ultracool (K5<SpT<M8.5) candidate members in the Upper Scorpius OB association using the literature and the USNO-B (Cat. <I/284>) and the UCAC2 (Cat. <I/294>) catalogues. 251 of these objects have a USNO-B and/or UCAC2 counterpart with proper motion measurements.
554. Proper motions of faint ROSAT WTT stars
ID:
ivo://CDS.VizieR/J/A+A/341/L79
Title:
Proper motions of faint ROSAT WTT stars
Short Name:
J/A+A/341/L79
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present proper motions of 59 stars of the ROSAT All-Sky Survey (RASS) located in direction of the Chamaeleon star forming region (SFR) in the magnitude range B=5.1-17mag. Proper motions of the fainter stars were newly derived utilizing survey Schmidt plates from the GSC~II plate archive and from a set of special plates taken with the ESO Schmidt telescope. The vector point diagram (VPD) indicates that the certified weak emission-line T Tauri (WTT) stars cluster away from the region occupied by the brighter pre-main-sequence stars (PMS) in Cha I. The distance to this new association is estimated at ~100pc, sensibly smaller than the 150pc generally assumed for the SFR. This yields an upper limit of 2km/s for the velocity dispersion of this new kinematic group. The de-reddened CM diagram of the group members suggest the WTT stars are still PMS objects, but older (3-30Myr) and less massive than previous determinations. These revised age estimates, the newly derived group peculiar velocity, and current distance estimates to the Cha~I/II/III complex would favour in-situ formation against that predicted by high velocity cloud models. Finally, based on a redetermination of the peculiar motions of stars and gas, we speculate that the whole SFR originated from the local Orion spur as a result of more classical mechanisms like interactions with the spiral arms.
555. Proper motions of faint UV-bright sources
ID:
ivo://CDS.VizieR/J/PASP/118/1639
Title:
Proper motions of faint UV-bright sources
Short Name:
J/PASP/118/1639
Date:
21 Oct 2021
Publisher:
CDS
Description:
Proper motions with values >=10 or <=10mas/yr have been extracted from the USNOB1.0 and Tycho2 catalogs for all Lanning UV-bright sources identified in the Sandage Two-Color Survey of the Galactic Plane and presented in Papers I-VI (Cat. <II/257>. Of the 572 sources examined, we find at least 213 that exhibit a significantly large proper motion. Based on the location of the sources in a reduced proper motion diagram, we demonstrate that about two-thirds of the high proper motion sources are likely or very likely to be heretofore unidentified white dwarfs.
556. Proper motions of FBS blue stellar objects
ID:
ivo://CDS.VizieR/J/MNRAS/407/681
Title:
Proper motions of FBS blue stellar objects
Short Name:
J/MNRAS/407/681
Date:
21 Oct 2021
Publisher:
CDS
Description:
A new method for combined calculations of proper motions (PMs) based on accurate measurements of POSS1 and POSS2 epoch plates is given. The positional accuracy of various surveys and catalogues is estimated, and statistical weights for each of them are established. To achieve the best positions, weighted averaging of direct measurements on DSS1/DSS2, and data from APM, MAPS, USNO-A2.0, USNO-B1.0 and GSC 2.3.2 catalogues were used. The rms accuracy of positions achieved for POSS1 is 119mas in each coordinate and 168 mas total and for POSS2 is 69mas in each coordinate and 98mas total. Using these accurate positions and the large separation in years between POSS1 and POSS2, we have calculated the best possible proper motions: 3.9mas/yr in each coordinate and 5.5mas/yr total. We have worked out methods to control and exclude accidental errors that appear in any survey. We have compared and combined our PM with those given in USNO-B1.0, SDSS DR7, and Tycho-2 catalogs and obtained even better results: 3.0mas/yr in each coordinate and 4.2mas/yr total PM. This approach has been applied to the First Byurakan Survey blue stellar objects containing a significant number of white dwarfs and subdwarfs. Altogether 640 objects have been revealed with PM>=10mas/yr, the detection limit for this method; and an electronic table of these objects is given. For more confident proper motions, we adopt the limit 20mas/yr (333 objects). Adopting 50km/s as an upper limit for tangential velocities, we have calculated maximum distances and absolute magnitudes and estimated luminosity types for these objects and obtained 185 probable white dwarfs (M>8mag), 69 possible white dwarfs (6mag<M<8mag), and 42 candidate sd/WDs (3mag<M<6mag). Given that we have re-discovered 141 genuine white dwarfs among the classified objects, the success rate of discovery of white dwarfs is estimated as 83% and 38% for our probable and possible white dwarfs, respectively.
557. Proper motions of field HB stars
ID:
ivo://CDS.VizieR/J/A+A/397/899
Title:
Proper motions of field HB stars
Short Name:
J/A+A/397/899
Date:
21 Oct 2021
Publisher:
CDS
Description:
We set new limits on the mass of the Milky Way, making use of the latest kinematic information for Galactic satellites and halo objects. Our sample consists of 11 satellite galaxies, 137 globular clusters, and 413 field horizontal-branch (FHB) stars up to distances of 10kpc from the Sun. Roughly half of the objects in this sample have measured proper motions, permitting the use of their full space motions in our analysis. The field horizontal branch stars presented in table1 was created from the list of Wilhelm 1999 (J/AJ/117/2329) as the source of magnitudes, radial velocities and [Fe/H]; the proper motions were extracted from one or more proper-motion catalogs: STARNET Catalog (Roeser 1996), Yale-San Juan Southern Proper Motion Catalog (SPM 2.0: Platais et al. 1998, Cat. I/283), Lick Northern Proper Motion Catalog (NPM1: Klemola et al. 1994, Cat. I/199), and TYCHO-2 Catalog (Hog et al. 2000, Cat. I/259).
558. Proper motions of field L and T dwarfs
ID:
ivo://CDS.VizieR/J/MNRAS/384/1399
Title:
Proper motions of field L and T dwarfs
Short Name:
J/MNRAS/384/1399
Date:
21 Oct 2021
Publisher:
CDS
Description:
The proper motion measurements for 142 previously known L and T dwarfs are presented. From this sample we identify and discuss eight high-velocity L dwarfs. We also find four new wide common proper motion binaries/multiple systems. Using the moving cluster methods we have also identified a number of L dwarfs that may be members of the Ursa Major (age~400Myr), the Hyades (age~625Myr) and the Pleiades (age~125Myr) moving groups.
559. Proper motions of field L and T dwarfs
ID:
ivo://CDS.VizieR/J/MNRAS/390/1517
Title:
Proper motions of field L and T dwarfs
Short Name:
J/MNRAS/390/1517
Date:
21 Oct 2021
Publisher:
CDS
Description:
By using images taken with Wide Field Camera (WFCAM) on United Kingdom Infrared Telescope (UKIRT) and Son of ISAAC (SofI) on the New Technology Telescope (NTT) and combining them with Two Micron All Sky Survey (2MASS) we have measured proper motions for 125 L and T dwarfs in the dwarf archive. Two of these L dwarfs appear to have M dwarf common proper motion companions, and two also appear to be high-velocity dwarfs, indicating possible membership of the thick disc. We have also compared the motion of these 125 objects to that of numerous moving groups, and have identified new members of the Hyades, Ursa Major and Pleiades moving groups. These new objects, as well as those identified in Jameson et al. have allowed us to refine the L dwarf sequence for Ursa Major that was defined by Jameson et al, 2008 (Cat. J/MNRAS/384/1399).
560. Proper motions of fundamental stars (PMFS)
ID:
ivo://CDS.VizieR/I/266
Title:
Proper motions of fundamental stars (PMFS)
Short Name:
I/266
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalog contains the proper motions of 1535 Basic FK5 stars (Cat. <I/175>) derived from a direct combination of the Hipparcos catalog with 6 compiled and 57 observational ground-based astrometric catalogs. We used the positions and parallaxes from the HIP (Cat. <I/239>), radial velocities from the HIC (Cat. <I/196>) and positions from 57 observational ground-based catalogs with the mean epochs from 1939 to 1995. The differences of RA and DEC in the sense of `observational catalog minus HIP at the observational catalog epoch' were calculated and approximated by Legendre-Hermite-Fourier functions which then were eliminated. Thus formed the series of star positions referred to the ICRS for the various epochs were used to derive the new proper motions. The proper motions from the HIP and ground-based compilations GC, N30, FK5, N70E, CMC9 and KSV2 (Time Service Catalog 2) reduced to the Hipparcos system were used for the calculation of mean weighted proper motions as initial values for the first iteration of the main procedure. The resulting proper motions keep the proper motion system of Hipparcos (this is an advantage of the PMFS proper motions over ground-based ones such as from the FK5) but they are individually independent from any other proper motions, such as HIP, FK5, FK6, etc. The advantage of the PMFS proper motions over HIP ones is that they reflect the star motions over decades, not only in the course of the mission. Namely, the non-linear motions of 134 stars were directly separated into their proper motions of the barycentres and periodical motions of the photocentres around barycentres, and the proper motions of some other 200 stars were separated from their non-linear motions which were implicit in large differences between the PMFS and HIP proper motions of the stars. The stars were classified into 760 single ones, 187 astrometrically wide pairs, 35 astrometrically close pairs for which the results are doubtful and 551 stellar systems with 553 brighter components in the Basic FK5 for which the astrometrically observed photocentre moves, or can move, non-linearly with an amplitude >1 mas (including almost all known visual, photocentric and spectroscopic orbital pairs). Thus, the PMFS proper motions are the ones of the barycentres of these stars and stellar systems. The median precision of the proper motion components is 0.5 mas/year for proper motion on RA and 0.7 mas/year on DEC. Details are can be found at http://www.geocities.com/georgegontcharov/