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131. Coma Berenices neighbor moving group
ID:
ivo://CDS.VizieR/J/A+A/624/L11
Title:
Coma Berenices neighbor moving group
Short Name:
J/A+A/624/L11
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of a kinematically cold group of stars, located in the immediate neighborhood of the well-known star cluster Coma Berenices (Mel 111). The new group identified in tangential velocity space as measured by Gaia contains at least 177 coeval members distributed in two subgroups, and appears as a flattened structure parallel to the plane, stretching for about 50pc. More remarkably, the new group, which appears to have formed about 300Myr later than Mel 111 in a different part of the Galaxy, will share essentially the same volume with the older cluster when the centers of both groups will be at their closest in 13 Myr. This will result in the mixing of two unrelated populations with different metallicities. The phase of cohabitation for these two groups is about 20-30Myr, after which the two populations will drift apart. We estimate that temporal cohabitation of such populations is not a rare event in the disk of the Milky Way, and of the order of once per Galactic revolution. Our study also unveils the tidal tails of the Mel 111 cluster.
132. Combined astrometric catalogue EOC-3
ID:
ivo://CDS.VizieR/J/A+A/463/783
Title:
Combined astrometric catalogue EOC-3
Short Name:
J/A+A/463/783
Date:
21 Oct 2021
Publisher:
CDS
Description:
In the past, we collected the astrometric observations of latitude/universal time variations made worldwide at 33 observatories. These observations, referred to Hipparcos Catalogue, were then used to determine the Earth Orientation Parameters (EOP) at 5-day intervals, covering the interval 1899.7-1992.0. Later on, new astrometric catalogues (such as ARHIP or TYCHO-2) appeared as combination of Hipparcos/Tycho positions with ground-based catalogues. These catalogues yield more accurate proper motions than the original Hipparcos Catalogue. Many of the objects observed in the programmes of monitoring Earth orientation from the ground are double or multiple systems, having non-negligible periodic motions. We aim at obtaining a star catalogue with improved proper motions and quasi-periodic terms reflecting orbital motions of the stars observed in these programmes. We used about 4.5 million observations of latitude/universal time variations, and combined them with the catalogues ARIHIP, TYCHO-2 etc... in order to obtain Earth Orientation Catalogue (EOC). Spectral analysis of ground-based data is made in order to discover which of the observed objects display periodic motions, and the method of least squares is then used to estimate corresponding amplitudes and phases. The third version of the catalogue, EOC-3, contains 4418 different objects (i.e., stars, components of double stars, photocenters). Our attempt leads to a description of more accurate paths of the observed objects that will be eventually used for another determination of the Earth Orientation Parameters in the twentieth century.
133. Combined Lick-Voyager Reference Star Catalogue
ID:
ivo://CDS.VizieR/I/125A
Title:
Combined Lick-Voyager Reference Star Catalogue
Short Name:
I/125A
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalogue contains accurate equatorial coordinates for stars in several bands of sky against which cameras of Voyager spacecraft were pointed for observations in the regions of Jupiter, Saturn, Uranus and Neptune during the flyby. This catalogue is compiled by combining the four reference star catalogues for Voyager mission: Uranus-Voyager Reference Star Catalogue <I/115> Klemola A.R., Owen Jr. W.M. <Lick Obs., Jet Propulsion Lab. (1985)> Neptune-Voyager Reference Star Catalogue <I/140> Klemola A.R., Owen Jr. W.M. <Lick Obs., Jet Propulsion Lab. (1986)> Jupiter-Voyager Reference Star Catalogue <I/152> Klemola A.R., Morabito L., Taraji H. <Lick Obs. (1978)> (Corrections by Owen Jr. W.M., 1990) Saturn-Voyager Reference Star Catalogue <I/153> Klemola A.R., Taraji H., Ocampo A. <Lick Obs. (1979)> (Corrections by Owen Jr. W.M., 1990) Note however that the corrections applied in 1990 to the last two catalogue Jupiter-Voyager and Saturn-Voyager are not incorporated here.
134. Compiled catalog of stellar data of Miras
ID:
ivo://CDS.VizieR/J/A+A/384/925
Title:
Compiled catalog of stellar data of Miras
Short Name:
J/A+A/384/925
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Compiled Catalogue of Mira variables is a result of a merge of the 4th edition of the General Catalogue of Variable Stars (GCVS-4) <II/214A> and present-day high-precision catalogues of space (Hipparcos-Tycho family: Hipparcos <I/239>, Tycho-1 <I/239>, Tycho-2 <I/259>, ACT RC <I/246>, TRC <I/250>) and ground-based (CMC11 <I/256>, PPM-N <I/146>, PPM-S <I/193>, PPM-add <I/208>, Kharchenko 1992) data. The catalogue contains 1103 Miras. Equatorial coordinates were taken from the source catalogues in accordance with the priority: Hipparcos, Tycho-2, Tycho-1, CMC11, PPM, Kharchenko 1992. The proper motions of 1041 Miras are calculated as mean weighted values of source data reduced to the Hipparcos system. The radial velocities of 786 Miras were taken from nine catalogues and lists of Feast (1963MNRAS.125..367F, 1966MNRAS.132..495F), Smak and Preston (1965ApJ...142..943S), Perry and Bidelman (1965PASP...77..214P), Feast et al. (1972MNRAS.158...23F), Dean (1976AJ.....81..364D), Barnes and Fekel (1977Obs....97....1B), Feast et al. (1980MNRAS.190..227F), Barbier-Brossat and Figon (2000) <III/213>, and are given with respect of the absorption lines. For those radial velocities, which were determined from emission lines the correction has been made along with Ikaunieks (1971) relation: VR(abs) - VR(em) = 0.035 * Period. For 724 Miras both proper motions and radial velocities are available. The stars in the Compiled Catalogue are sorted in the same order as in the General Catalogue of Variable Stars.
135. Coronae of nearby star clusters
ID:
ivo://CDS.VizieR/J/A+A/645/A84
Title:
Coronae of nearby star clusters
Short Name:
J/A+A/645/A84
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a novel view on the morphology and dynamical state of ten prominent, nearby (<=500pc), and young (~30-300Myr) open star clusters with Gaia DR2: Per, Blanco 1, IC 2602, IC 2391, Messier 39, NGC 2451A, NGC 2516, NGC 2547, Platais 9, and the Pleiades. We introduce a pioneering member-identification method that is informed by cluster bulk velocities and deconvolves the spatial distribution with a mixture of Gaussians. Our approach enables inferring the true spatial distribution of the clusters by effectively filtering field star contaminants while at the same time mitigating the effect of positional errors along the line of sight. This first application of the method reveals vast stellar coronae that extend for >~100pc and surround the cluster cores, which are comparatively tiny and compact. The coronae and cores form intertwined, coeval, and comoving extended cluster populations, each encompassing tens of thousands of cubic parsec and stretching across tens of degrees on the sky. Our analysis shows that the coronae are gravitationally unbound but largely comprise the bulk of the stellar mass of the populations. Most systems are in a highly dynamic state, showing evidence of expansion and sometimes simultaneous contraction along different spatial axes. The velocity field of the extended populations for the cluster cores appears asymmetric but is aligned along a spatial axis unique to each cluster. The overall spatial distribution and the kinematic signature of the populations are largely consistent with the differential rotation pattern of the Milky Way. This finding underlines the important role of global Galactic dynamics in the fate of stellar systems. Our results highlight the complexity of the Milky Way's open cluster population and call for a new perspective on the characterization and dynamical state of open clusters.
136. Corrected proper motion for HIP stars
ID:
ivo://CDS.VizieR/J/AN/341/770
Title:
Corrected proper motion for HIP stars
Short Name:
J/AN/341/770
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Independent Latitude Stations (INDLS) catalog of proper motion in declination {mu}_{delta}_ for 682 bright Hipparcos (HIP) stars is presented. It is obtained in the Hipparcos reference frame, and only the Hipparcos mean position at epoch 1991.25 is used for INDLS data to calculate independent {mu}_{delta}$ (the HIP {mu}_{delta}_ values are not entering the INDLS data). Catalog comparisons were made in pairs for the four catalogs (HIP, new Hipparcos -- NHIP, Gaia DR2, INDLS) to look for possible systematic differences as a function of brightness, color, position coordinates ({alpha}, {delta}). All catalogs were found in agreement, except: 0.21mas/yr for differences INDLS-DR2 in line with the brightness, -0.13mas/yr and 0.24mas/yr for differences HIP-DR2 in line with the free term and brightness respectively, -0.16mas/yr, 0.23mas/yr and 0.13mas/yr for differences NHIP$-$DR2 in line with the free term, brightness and color respectively. A slightly better consistency is in the cases INDLS-NHIP and INDLS-DR2 than HIP-DR2 and NHIP-DR2. The systematic error is in line with brightness on the level 0.1mas/yr in DR2, and near 0.1mas/yr in line with color. An indication that the bright reference frame of DR2 rotates by about 0.1mas/yr relative to the faint quasar frame is in line with a presented sinusoidal curve of differences {mu}_{delta}_ as a function of {alpha}. Its amplitude is A=0.53+/-0.11mas/yr for INDLS-DR2 (0.26+/-0.07 for INDLS-NHIP); about 0.2 belongs to DR2. The level of formal errors is near 1.9mas/yr for the case INDLS-DR2, and near 1.5 for: INDLS-NHIP, HIP-DR2, NHIP-DR2. The values {mu}_{delta}_ of bright DR2 stars could be underestimated; the astrometry is unreliable for G<=6mag due to detector saturation.
137. CPASJ2 catalogue
ID:
ivo://CDS.VizieR/J/A+AS/136/1
Title:
CPASJ2 catalogue
Short Name:
J/A+AS/136/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
According to the cooperation between Beijing, San Juan and La Plata Astronomical Observatories, the photoelectric astrolabe Mark II(PAII) of the Beijing Astronomical Observatory was moved and installed at the San Juan Observatory, Argentina in January, 1992 for observations of the catalogue of stars in the southern hemisphere. The first observing period was from Feb. 23, 1992 to Mar. 31, 1997. Using the data observed in San Juan with the instrument during this period, residuals for 11002 stars are reduced from about 405700 observations of stars over 1532 days. The mean precision of the residuals is +/-0.043". The Second Catalogue of Stars (CPASJ2) has been compiled from double transits at both the eastern and western passages. There are 5241 stars in this catalogue, including 1225 FK5/FK4Supp stars, 794 FK5Ext stars, 1084 SRS stars, 937 CAMC4 stars, 310 GC stars and 891 IMF stars. The mean precisions are +/-3.2ms and +/-0.057" in right ascension and declination, respectively. The magnitudes of stars are from 2.0 to 11.5. The declinations are from -3{deg} to -60{deg}. The mean epoch is 1994.9. Finally, systematic corrections of(CPASJ2-FK5) are given.
138. CPASJ1 catalogue
ID:
ivo://CDS.VizieR/J/A+AS/118/1
Title:
CPASJ1 catalogue
Short Name:
J/A+AS/118/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
On the basis of the data observed with the photoelectric astrolabe Mark II(PA II) of Beijing Astronomical Observatory in San Juan of Argentina from Feb. 23, 1992 to Feb. 28, 1995, residuals of 7200 stars are reduced according to about 230000 observations of stars. The mean precision of the residuals is +/-0.046". Using the data, the first catalogue of stars (CPASJ1) have been compiled. There are 2980 stars in this catalogue included 989 FK5/FK4Supp stars, 658 FK5Ext stars, 387 SRS stars, 687 CAMC4 stars, 192 GC stars, and 72 Hipparcos stars. The mean precisions are +/-3.2ms and +/-0.061" in right ascensions and declinations, respectively. The magnitudes of stars are from 2mag to 11.3mag. The declinations are from -3deg to -60deg. The mean epoch is 1993.6. Finally, systematic corrections of(CPASJ1-FK5) are given.
139. CPASJ3 catalogue
ID:
ivo://CDS.VizieR/J/A+A/430/327
Title:
CPASJ3 catalogue
Short Name:
J/A+A/430/327
Date:
21 Oct 2021
Publisher:
CDS
Description:
Resulting from the cooperation between Beijing, San Juan and La Plata Astronomical Observatories, the photoelectric astrolabe Mark II(PAII) of the Beijing Astronomical Observatory was moved and installed at the San Juan Observatory, Argentina in January, 1992 for observations of stars in the southern hemisphere. Using the data observed with the instrument from Feb. 23 1992 to Mar. 11, 2000 over 2382 days, the Third San Juan photoelectric astrolabe catalogue has been compiled from double transits at both the eastern and western passages. There are 6762 stars in this catalogue, including 6156 Hipparcos stars (in which there are 69 radio stars), 8 FK5 stars, 47 SRS stars, 551 CAMC4 stars. The mean precisions are +/-3.0ms and +/-0.053"' in right ascension and declination, respectively. The magnitudes of stars are from 1.0 to 11.5. The declinations are from -3{deg} to -60{deg}. The mean epoch is 1996.3. Systematic corrections of (CPASJ3-Hipp) are given.
140. CPASJ1 position corrections
ID:
ivo://CDS.VizieR/J/other/PBeiO/24.71
Title:
CPASJ1 position corrections
Short Name:
J/other/PBeiO/24
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using the data observed with the Photoelectric Astrolabe Mark II (PA II) of the Beijing Astronomical Observatory during the period from Feb. 1992 to Oct. 1993 in San Juan of Argentina, the first catalogue of stars (PASJ1, Cat. <J/A+AS/118/1>) have been compiled. It consists of 1400 stars included 682 FK5/FK4 Supp stars. 433 FK5 Ext stars and 285 CAMC stars (1, 1989). The mean precisions of delta alpha's and delta delta's are +/-3.2ms and 0.055", respectively. The mean epoch is 1992.9. Finally, systematic corrections of (PASJ1-FK5) are given.

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