VizieR Online Data Catalog: New Galactic clusters in the VVVX disc area (Borissova+, 2018)
Abstract
The VVV and VVVX data were obtained with the 4.1-m ESO VISTA telescope (Visual and Infrared Survey Telescope for Astronomy; Emerson, McPherson & Sutherland 2006Msngr.126...41E) located at Cerro Paranal, Chile, with the 16-detector VIRCAM (VISTA Infrared CAMera; Dalton et al. 2006SPIE.6269E..0XD). It has an ~1x1.5deg2 field of view and works in the 0.9-2.5μm wavelength range and a pixel scale of 0.34arcsec/pixel. The data are reduced with the VISTA Data Flow System (VDFS; Emerson et al. 2004SPIE.5493..401E; Irwin et al. 2004SPIE.5493..411I) at the Cambridge Astronomical Survey Unit (CASU). Processed images and photometric catalogues are available from the ESO Science Archive3 and from the VISTA Science Archive4 (VSA; Cross et al. 2012A&A...548A.119C). A single VIRCAM image, called paw, contains large gaps; six paws taken in a spatial offset pattern must be combined to fill them in, obtaining a contiguous image, called tile. The VVVX paws and tiles are aligned along l and b. The total exposure time of the tiles are: 8s in KS (for a single epoch), 24s in H and 60 in J band. The tiles overlap by a few arcmin in Galactic latitude and longitude - just like with the VVV - to ensure homogeneous coverage, spatial continuity and overall photometric and astrometric consistency. We have also collected K-band spectra of 3 and 2 stars for VVVX CL010 and CL011, respectively, using the IR spectrograph and imaging camera SofI in long-slit mode, mounted on the ESO New Technology Telescope (NTT). Some parameters of these stars are measured in the Gaia DR2 catalogue and are tabulated in Table 1. We identified 120 new candidate star clusters or stellar groups, listed in Table A1. In Table B1 are tabulated the candidate star clusters with reliable Gaia DR2 parameters.
(3 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- June 2022
- Bibcode:
- 2022yCat..74813902B
- Keywords:
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- Clusters: open;
- Infrared;
- Photometry;
- Positional data