Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/430/3350    Proper motions and membership in NGC 3766 (Yadav+, 2013)

Proper motions and membership probabilities of stars in the region of open cluster NGC 3766. Yadav R.K.S., Sariya D.P., Sagar R. <Mon. Not. R. Astron. Soc., 430, 3350-3358 (2013)> =2013MNRAS.430.3350Y
ADC_Keywords: Clusters, open ; Proper motions ; Photometry Keywords: catalogues; astrometry - Hertzsprung-Russell and colour-magnitude diagrams - stars: kinematics and dynamics - stars: luminosity function, mass function - open clusters and associations: individual: NGC 3766 Abstract: Relative proper motions (PMs) and cluster membership probabilities (Pmu) 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 Pmu>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. Description: CCD data for NGC 3766 were collected with the wide-field imager camera (WFI) mounted on the 2.2-m ESO/MPI telescope at La Silla, Chile. Using the archival data of two epochs, PMs were computed. The first epoch consists of four images in the B filter and three images in the V filter taken on 2000 February 27, while the second epoch has four images in the V filter taken on 2006 April 9. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 104 2468 Catalogue of proper motions with their corresponding uncertainties and membership probabilities for about 2500 stars in the region of NGC 3766
See also: J/ApJ/622/1052 : byHα photometry of NGC 3766 (McSwain+, 2005) J/A+A/554/A108 : Periodic variables in NGC 3766 (Mowlavi+, 2013) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/2468] Sequential number 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 37 F8.3 pix Xpos X position 39- 46 F8.3 pix Ypos Y position 48- 54 F7.3 mas/yr pmRA Proper motion along RA, pmRA*cosDE 56- 60 F5.3 mas/yr e_pmRA rms uncertainty on pmRA 62- 68 F7.3 mas/yr pmDE Proper motion along DE 70- 74 F5.3 mas/yr e_pmDE rms uncertainty on pmDE 76- 81 F6.3 mag Bmag B magnitude 83- 87 F5.3 mag e_Bmag rms uncertainty on Bmag 89- 94 F6.3 mag Vmag V magnitude 96-100 F5.3 mag e_Vmag rms uncertainty on Vmag 102-104 I3 % Pmu [0/100] Membership probability from proper motion
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Apr-2014
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© Université de Strasbourg/CNRS

    • Contact