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371. Proper motions and astrometry of late-type dwarfs
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.
372. Proper motions and JHK of 24 Berkeley clusters
ID:
ivo://CDS.VizieR/J/MNRAS/389/285
Title:
Proper motions and JHK of 24 Berkeley clusters
Short Name:
J/MNRAS/389/285
Date:
21 Oct 2021
Publisher:
CDS
Description:
The main astrophysical parameters of 24 previously unstudied open clusters of Berkeley catalogue are presented here. JHK near-infrared (Two Micron All Sky Survey, Cat. II/246) photometry and the proper motions astrometry of Naval Observatory Merged Astrometric Dataset (NOMAD, Cat. I/297) are used. The clusters' centres, angular diameters, ages, distances and colour excesses for these clusters are estimated for the first time.
373. Proper Motions in Cape Zone Catalogue -40/-52
ID:
ivo://CDS.VizieR/I/5
Title:
Proper Motions in Cape Zone Catalogue -40/-52
Short Name:
I/5
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalog, listing the proper motions of 20,843 stars from the Cape Astrographic Zones, was compiled from three series of photographic plates. The plates were taken at the Royal Observatory, Cape of Good Hope, in the following years: 1892-1896, 1897-1910, 1923-1928. Data given include centennial proper motion, photographic and visual magnitude, Harvard spectral type, Cape Photographic Durchmusterung (CPD) identification, epoch, right ascension and declination for 1900.
374. Proper motions in NGC 3680
ID:
ivo://CDS.VizieR/I/212
Title:
Proper motions in NGC 3680
Short Name:
I/212
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)
375. Proper Motions in Praesepe
ID:
ivo://CDS.VizieR/I/257B
Title:
Proper Motions in Praesepe
Short Name:
I/257B
Date:
21 Oct 2021
Publisher:
CDS
Description:
High-precision proper motions for 257 and 296 stars in a 90'x90' region centered on BD+20 2170 were obtained from seven plates taken with the Zo-se 40cm refractor (f=6895mm) in March, 1986 (see the "Plate Summary" section below), combined with six AC plates and the stellar positions in Russell's (1976, Ph.D. Thesis, Pittsburgh University). Combined with other data, membership probabilities were estimated by an improved maximum likelihood method. A very good sample of 198 members is obtained with proper motion accuracies ranging from +/-0.2 to +/-5.0mas/yr, of which 60% are better than +/-1.0mas/yr; the completeness limit is about B=15.5mag. Note that the table published in electronic form associated to the paper published in 1995A&AS..113..419W presented positions not correctly associated to the stars (see the "History" section below)
376. Proper motions of metal-poor stars
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.
377. Proper motions of 555 quasars from VLBI
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.
378. Proper Motions, UBV-Phot. & Spectral Class Region 7092
ID:
ivo://CDS.VizieR/I/203
Title:
Proper Motions, UBV-Phot. & Spectral Class Region 7092
Short Name:
I/203
Date:
21 Oct 2021
Publisher:
CDS
Description:
A catalogue of positions, proper motions and photographic UBV-magnitudes for 7931 stars in and around the open cluster NGC 7092 (M39) is presented. The Catalogue is complete down to B=16.0m and covers an area with diameter of ~110'. The spectral types are provided for 511 stars generally brighter than B=13.0m. For convenience, basic cross-identifications are also included. Refer to the file "intro.txt" for full details about the catalogue.
379. Properties of dwarf galaxies in the Local Group
ID:
ivo://CDS.VizieR/J/AJ/144/4
Title:
Properties of dwarf galaxies in the Local Group
Short Name:
J/AJ/144/4
Date:
21 Oct 2021
Publisher:
CDS
Description:
Positional, structural, and dynamical parameters for all dwarf galaxies in and around the Local Group are presented, and various aspects of our observational understanding of this volume-limited sample are discussed. Over 100 nearby galaxies that have distance estimates reliably placing them within 3Mpc of the Sun are identified. This distance threshold samples dwarfs in a large range of environments, from the satellite systems of the MW and M31, to the quasi-isolated dwarfs in the outer regions of the Local Group, to the numerous isolated galaxies that are found in its surroundings. It extends to, but does not include, the galaxies associated with the next nearest groups, such as Maffei, Sculptor, and IC 342. Our basic knowledge of this important galactic subset and their resolved stellar populations will continue to improve dramatically over the coming years with existing and future observational capabilities, and they will continue to provide the most detailed information available on numerous aspects of dwarf galaxy formation and evolution. Basic observational parameters, such as distances, velocities, magnitudes, mean metallicities, as well as structural and dynamical characteristics, are collated, homogenized (as far as possible), and presented in tables that will be continually updated to provide a convenient and current online resource. As well as discussing the provenance of the tabulated values and possible uncertainties affecting their usage, the membership and spatial extent of the MW sub-group, M31 sub-group, and the Local Group are explored. The morphological diversity of the entire sample and notable sub-groups is discussed, and timescales are derived for the Local Group members in the context of their orbital/interaction histories. The scaling relations and mean stellar metallicity trends defined by the dwarfs are presented, and the origin of a possible "floor" in central surface brightness (and, more speculatively, stellar mean metallicity) at faint magnitudes is considered.
380. Properties of metal-poor stars in APOGEE DR13
ID:
ivo://CDS.VizieR/J/ApJ/852/49
Title:
Properties of metal-poor stars in APOGEE DR13
Short Name:
J/ApJ/852/49
Date:
21 Oct 2021
Publisher:
CDS
Description:
We find two chemically distinct populations separated relatively cleanly in the [Fe/H]-[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars (primarily with metallicities [Fe/H]<-0.9) observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) and analyzed for Data Release 13 (DR13) of the Sloan Digital Sky Survey. These two stellar populations show the most significant differences in their [X/Fe] ratios for the {alpha}-elements, C+N, Al, and Ni. In addition to these populations having differing chemistry, the low metallicity high-Mg population (which we denote "the HMg population") exhibits a significant net Galactic rotation, whereas the low-Mg population (or "the LMg population") has halo-like kinematics with little to no net rotation. Based on its properties, the origin of the LMg population is likely an accreted population of stars. The HMg population shows chemistry (and to an extent kinematics) similar to the thick disk, and is likely associated with in situ formation. The distinction between the LMg and HMg populations mimics the differences between the populations of low- and high-{alpha} halo stars found in previous studies, suggesting that these are samples of the same two populations.

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