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The Gaia/IPHAS and Gaia/KIS value-added catalogues

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  • S. Scaringi
  • C. Knigge
  • J. E. Drew
  • M. Monguió
  • E. Breedt
  • M. Fratta
  • B. Gänsicke
  • T. J. Maccarone
  • A. F. Pala
  • C. Schill
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Original languageEnglish
Number of pages13
Pages (from-to)3357-3369
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date11 Dec 2018
Volume481
Issue3
Early online date13 Sep 2018
DOIs
Publication statusPublished - 11 Dec 2018

Abstract

We present a sub-arcsecond crossmatch of Gaia DR2 against the INT Photometric Ha Survey of the Northern Galactic Plane Data Release 2 (IPHAS DR2) and the Kepler-INT Survey (KIS). The resulting value-added catalogues (VACs) provide additional precise photometry to the Gaia photometry (r, i, and Ha for IPHAS, with additional U and g for KIS). In building the catalogue, proper motions given in Gaia DR2 are wound back to match the epochs of IPHAS DR2, thus ensuring high proper motion objects are appropriately crossmatched. The catalogues contain 7927 224 and 791 071 sources for IPHAS and KIS, respectively. The requirement of > 5σ parallax detection for every included source means that distances out to 1-1.5 kpc are well covered. We define two additional parameters for each catalogued object: (i) fc, a magnitude-dependent tracer of the quality of the Gaia astrometric fit; (ii) fFP, the false-positive rate for parallax measurements determined from astrometric fits of a given quality at a given magnitude. Selection cuts based on these parameters can be used to clean colour-magnitude and colour-colour diagrams in a controlled and justified manner.We provide both full and light versions of the VAC, with VAC-light containing only objects that represent our recommended trade-off between purity and completeness. Uses of the catalogues include the identification of new variable stars in the matched data sets, and more complete identification of Ha-excess emission objects due to separation of high-luminosity stars from the main sequence.

Notes

This article has been published in Monthly Notices of the Royal Astronomical Society: Letters. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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