- 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.
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- 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.
- ID:
- ivo://CDS.VizieR/J/A+A/396/125
- Title:
- Proper motions and BV photometry in NGC 1513
- Short Name:
- J/A+A/396/125
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of astrometric and photometric investigations of the poorly studied open cluster NGC 1513 are presented. The proper motions of 333 stars with a root-mean-square error of 1.9mas/yr were obtained by means of the automated measuring complex "Fantasy". Eight astrometric plates covering the time interval of 101 years were measured and a total of 141 astrometric cluster members identified. BV CCD-photometry was obtained for stars in an area 17'x17' centered on the cluster. Altogether 33 stars with high reliability were considered to be cluster members by two criteria. The estimated age of NGC 1513 is 2.54E+08 years.
- ID:
- ivo://CDS.VizieR/J/A+AS/142/373
- Title:
- Proper motions and BVRI photometry in NGC 4147
- Short Name:
- J/A+AS/142/373
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Astrometry and B VRI CCD photometry of 115 stars down to B=17.6 in the region of about 11'x11' around the globular cluster NGC 4147 was performed. In the astrometric reduction, three earlier epoch plates taken at Sheshan, Shanghai, China, in 1958 and four recent epoch B-passband CCD frames taken at Kavalur, India, were used. The data were reduced to a catalogue based on measurements of stars on seven plates with an epoch period from 1917 to 1979 taken in Bonn, Germany, and ultimately to the Hipparcos catalogue. The reduction was done with the central overlapping method. Based on the new proper motion data, the membership probabilities of 115 stars were determined. Furthermore, three colour-magnitude diagrams (CMD) of V versus B-V, V-R and V-I, respectively, for HB and GB stars were constructed from CCD photometry obtained with the Vainu Bappu Telescope. An absolute proper motion of the cluster of -2.08+/-0.48mas/yr in right ascension and -3.07+/-0.46mas/yr in declination has been obtained. The space velocity and apogalactic distance of the cluster with respect to the Galactic standard of rest were calculated. In contrast to the first results given in the literature we obtain a significantly lower velocity and a smaller apogalactic distance for NGC 4147.
- 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.
- ID:
- ivo://CDS.VizieR/J/A+A/584/A59
- Title:
- Proper motions and membership in NGC 6366
- Short Name:
- J/A+A/584/A59
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- NGC 6366 is a metal-rich globular cluster that is relatively unstudied. It is a kinematically interesting cluster, reported as belonging to the slowly rotating halo system, which is unusual given its metallicity and spatial location in the Galaxy. The purpose of this research is to determine the relative proper motion and membership probability of the stars in the region of globular cluster NGC 6366. To target cluster members reliably during spectroscopic surveys without including field stars, a good proper motion and membership probability catalogue of NGC 6366 is needed. To derive relative proper motions, the archival data from the Wide Field Imager mounted on the ESO 2.2m telescope have been reduced using a high precision astrometric software. The images used are in the B,V, and I photometric bands with an epoch gap of ~3.2yr. The calibrated BVI magnitudes have been determined using recent data for secondary standard stars.
- ID:
- ivo://CDS.VizieR/J/MNRAS/430/3350
- Title:
- Proper motions and membership in NGC 3766
- Short Name:
- J/MNRAS/430/3350
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Relative proper motions (PMs) and cluster membership probabilities (P_mu_) were derived for ~2500 stars in the field of the open star cluster NGC 3766. The cluster was observed in the B and V broad-band filters at two epochs separated by ~6yr using a wide-field imager mounted on the WFI@ESO 2.2-m telescope. All CCD frames were reduced using the astrometric techniques described by Anderson et al. (2006A&A...454.1029A, Paper I). The PM rms error for stars brighter than V~15mag is 2.0mas/yr, but it gradually increases up to ~4mas/yr at V~20mag. Using PM data, membership probabilities were derived for the stars in the region of the cluster. They indicate that one Ap and three Be stars are members of the cluster. A reddening of E(B-V)=0.22+/-0.05mag, a distance of 2.5+/-0.5kpc and an age of ~20Myr were derived using stars with P_mu_>70 per cent. A mass function slope of x=1.60+/-0.10 was derived for the cluster, and the cluster was found to be dynamically relaxed. Finally, we provide positions, calibrated B and V magnitudes, relative PMs and membership probabilities for the stars in the field of NGC 3766. We have produced a catalogue that is electronically available to the astronomical community.
- ID:
- ivo://CDS.VizieR/J/A+A/381/464
- Title:
- Proper motions and membership in NGC 2548
- Short Name:
- J/A+A/381/464
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Absolute proper motions, their corresponding errors and membership probabilities of 501 stars in the open cluster NGC 2548 region are given. 265 stars from Tycho-2 Catalogue (Cat. <I/259>) are used as the reference frame. Only 8 stars were found in this region from the Hipparcos Catalogue, and their respective cross-identification are given as notes. The material used consists in 10 plates taken at the Zo-Se station of Shanghai Observatory between 1916 and 1998.
- ID:
- ivo://CDS.VizieR/J/AJ/154/46
- Title:
- Proper motions and photometry for members of Cha I
- Short Name:
- J/AJ/154/46
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed a search for planetary-mass brown dwarfs in the Chamaeleon I star-forming region using proper motions and photometry measured from optical and infrared images from the Spitzer Space Telescope, the Hubble Space Telescope, and ground-based facilities. Through near-IR spectroscopy at Gemini Observatory, we have confirmed six of the candidates as new late-type members of Chamaeleon I ({>=}M8). One of these objects, ChaJ11110675-7636030, has the faintest extinction-corrected M_K_ among known members, which corresponds to a mass of 3-6M_Jup_ according to evolutionary models. That object and two other new members have redder mid-IR colors than young photospheres at {<=}M9.5, which may indicate the presence of disks. However, since those objects may be later than M9.5 and the mid-IR colors of young photospheres are ill-defined at those types, we cannot determine conclusively whether color excesses from disks are present. If ChaJ11110675-7636030 does have a disk, it would be a contender for the least-massive known brown dwarf with a disk. Since the new brown dwarfs that we have found extend below our completeness limit of 6-10M_Jup_, deeper observations are needed to measure the minimum mass of the initial mass function in Chamaeleon I.
