- 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.
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Search Results
- 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/PAZh/38/95
- Title:
- Proper motions and photometry in NGC 2323
- Short Name:
- J/PAZh/38/95
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of a comprehensive study of the Galactic open cluster NGC 2323 are presented. The positions of stars to a limiting magnitude B<=16.7mag in a 42.5x42.5arcmin area centered on the cluster were measured on six plates from the Pulkovo normal astrograph with a maximum epoch difference of 60yr. The measurements were performed with the Pulkovo "Fantasy" automated measuring system upgraded in 2010. The corresponding areas from the USNO-A2.0, USNO-B1, and 2MASS catalogues were used as additional plates. As a result, the relative proper motions of stars were obtained with a root-mean-square error of 5.85mas/yr. A catalogue of UBV and JHK magnitudes for objects in the investigated area was compiled from available published resources. The astrometric selection of cluster members was made by the maximum likelihood method. A high individual cluster membership probability of a star (P>=80%) served as the first selection criterion. The position of a star on the photometric color-magnitude (V-(B-V), J-(J-K)) diagrams of the cluster was considered as the second criterion. The position of an object on the color- color ((U-B)-(B-V), (J-H)-(J-K)) diagrams served as the third criterion. On the basis of these criteria, it was established that 508 stars are members of NGC 2323. These data were used to refine the physical parameters of the cluster: the mean reddening E(B-V)=0.25mag, the true distance modulus (V-M_V_)=9.85mag, and the cluster age of about 140Myr from the grid of isochrones computed by the Padova group for solar chemical composition. Two tables contain the catalogues of proper motions and photometry for stars in the area. The luminosity and mass functions were constructed. The cluster membership of red and blue giants, variable, double, and multiple stars was considered. The position of the cluster center was improved: alpha=07:02:47.5, delta=-08:20:16 (2000.0).
- ID:
- ivo://CDS.VizieR/J/AJ/142/71
- Title:
- Proper motions and photometry of stars near NGC7380
- Short Name:
- J/AJ/142/71
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present proper motions, radial velocities, and a photometric study of the Galactic open cluster NGC 7380, which is associated with prominent emission nebulosity and dark molecular clouds. On the basis of the sample of highly probable member stars, the star cluster is found to be at a distance of 2.6+/-0.4kpc, has an age of around 4Myr, and a physical size of ~6pc across with a tidal structure. The binary O-type star DH Cep is a member of the cluster in its late stage of clearing the surrounding material, and may have triggered the ongoing star formation in neighboring molecular clouds which harbor young stars that are coeval and comoving with, but not gravitationally bound by, the star cluster.
- ID:
- ivo://CDS.VizieR/V/27
- Title:
- Proper Motions and UBV Photometry in h+{chi} Per
- Short Name:
- V/27
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Proper motions with an 80 year baseline have been determined relative to reference stars with B=13.9mag. determined for 3086 stars brighter than B=15.5mag. within an area of 50' radius, centered at RA=2h16.9m, Dec=+57{deg}01' (1950.0). Two pairs of Tashkent normal astrograph plates with a mean epoch difference of 80 years was used. Proper motions were also measured for 1055 stars with 15.5 <= B <= 17.1 mag. in two areas 14' in radius, centered on the h and {chi} Persei clusters. Proper motions are also given for 1386 stars in an adjacent area (RA=2h06.7m, Dec=+56{deg}57') for 1386 stars with a 38 year baseline. The mean errors of the proper motions are equal in right ascension and declination. For the h and {chi} Perseus region, they are 0.0021"/yr and for the adjacent region, they are 0.0031"/yr. The proper motions in the adjacent area have been reduced to the system of those in the cluster region using 214 stars in common. UBV magnitudes of the stars were determined using plates taken with the 80/120/240 Schmidt telescope of the Radioastrophysical Observatory of the Academy of Sciences of the Latvian SSR and photoelectric standards published by Johnson and Morgan (1955ApJ...122..429J) and Widley (1964ApJS....8..439W). The number of measured plates and the corresponding errors are given in the following table: ----------------------------------------------------- FILE NAME # PLATES ERRORS (0.01mag) V B U V B U ----------------------------------------------------- data1.dat 2 3 2 6 5 6 data2.dat 1 2 - 8 6 - adjarea.dat 2 2 2 6 6 6 _____________________________________________________ Cluster members were selected on the basis of their proper motion and photometric criteria. The membership probability was calculated on the assumption of a normal distribution of the proper motions around the cluster proper motion.
- 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)
- ID:
- ivo://CDS.VizieR/J/A+AS/118/277
- Title:
- Proper motions in NGC 1647
- Short Name:
- J/A+AS/118/277
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The astrometric accuracy of triple image Carte du Ciel plates has been analysed using plates of the open cluster NGC 1647. A new multithreshold technique was used for the treatment of the triple image plates. Accuracies ranging from 100mas to 200mas were found. We determined proper motions with a median accuracy of 1.6mas/a for 2220 stars in the field of NGC 1647. The membership probabilities of stars in the cluster region agree very well with the data of Francic (1989). Due to a significant difference of the proper motions of SZ Tau and the cluster members, SZ Tau seems not to be a member of NGC 1647.
- ID:
- ivo://CDS.VizieR/J/other/ChJAA/6.435
- Title:
- Proper motions in NGC 6530
- Short Name:
- J/other/ChJAA/6.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- From photographic plate data of Shanghai Astronomical Observatory with a time baseline of 87 years, proper motions and membership probabilities of 364 stars in the open cluster NGC 6530 region are reduced. On the basis of membership determination, luminosity function and segregation effect of the cluster are discussed with details. Spatial mass segregation is obviously present in NGC 6530 while there is no clear evidence for a velocity-mass (or velocity-luminosity) dependence. The observed spatial mass segregation for NGC 6530 might be due to a combination of initial conditions and relaxation process.
- ID:
- ivo://CDS.VizieR/J/A+A/401/531
- Title:
- Proper motions in NGC 7243
- Short Name:
- J/A+A/401/531
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of astrometric and photometric investigations of the open cluster NGC 7243 are presented. Proper motions of 2165 stars with root-mean-square error of 1.1mas/yr were obtained by means of PDS scanning of astrometric plates covering the time interval of 97 years. A total of 211 cluster members down to V=15.5mag have been identified. V and B magnitudes have been determined for 2118 and 2110 stars respectively. Estimations of mass 348M_{sun}_<M<522M_{sun}_, age t=2.510^8^yr, distance r=698pc and reddening E(B-V)=0.24 of the cluster NGC 7243 have been made.
