2014A&A...563A..80L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST17:43:53

2014A&A...563A..80L - Astronomy and Astrophysics, volume 563A, 80-80 (2014/3-1)

Ground-based astrometry with wide field imagers. V. Application to near-infrared detectors: HAWK-I@VLT/ESO.

LIBRALATO M., BELLINI A., BEDIN L.R., PIOTTO G., PLATAIS I., KISSLER-PATIG M. and MILONE A.P.

Abstract (from CDS):

High-precision astrometry requires accurate point-spread function modeling and accurate geometric-distortion corrections. This paper demonstrates that it is possible to achieve both requirements with data collected at the high acuity wide-field K-band imager (HAWK-I), a wide-field imager installed at the Nasmyth focus of UT4/VLT ESO 8m telescope. Our final astrometric precision reaches ∼3mas per coordinate for a well-exposed star in a single image with a systematic error less than 0.1mas. We constructed calibrated astro-photometric catalogs and atlases of seven fields: the Baade's window, NGC 6656, NGC 6121, NGC 6822, NGC 6388, NGC 104, and the James Webb Space Telescope calibration field (in the Large Magellanic Cloud). We make these catalogs and images electronically available to the community. Furthermore, as a demonstration of the efficacy of our approach, we combined archival material taken with the optical wide-field imager at the MPI/ESO 2.2m with HAWK-I observations. We showed that we are able to achieve an excellent separation between cluster members and field objects for NGC 6656 and NGC 6121 with a time base-line of about 8-years. Using both HST and HAWK-I data, we also study the radial distribution of the SGB populations in NGC 6656 and conclude that the radial trend is flat within our uncertainty. We also provide membership probabilities for most of the stars in NGC 6656 and NGC 6121 catalogs and estimate membership for the published variable stars in these two fields.

Abstract Copyright:

Journal keyword(s): instrumentation: detectors - astrometry - techniques: image processing - Galaxy: bulge - globular clusters: general - proper motions

VizieR on-line data: <Available at CDS (J/A+A/563/A80): baadew_1.dat baadew_2.dat ngc6121.dat ngc6822.dat ngc6656.dat ngc6388.dat jwstcf.dat ngc104.dat hawkigdcbulge.f fits/*>

Status at CDS:   All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
3 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1677 0
6 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 805 1
7 NAME Baade Window reg 18 03.5 -30 01           ~ 528 3
8 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 455 1
9 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1217 0
10 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1430 0
11 NAME Local Group GrG ~ ~           ~ 6973 0
12 NAME Galactic Bulge reg ~ ~           ~ 3391 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-17:43:53

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