Gaia/IPHAS和Gaia/KIS增值目录
The Gaia/IPHAS and Gaia/KIS Value-Added Catalogues
摘要：
我们提出了一个亚角秒的交叉匹配盖亚DR 2对北银河平面数据发布2（IPHAS DR 2）和开普勒-INT调查（KIS）的INT光度H-α调查。由此产生的增值目录（VAC）为盖亚测光提供了额外的精确测光（IPHAS的r，i和H-alpha，KIS的额外U和g）。在建立星表时，\gaia \DR 2中给出的自行被回退以匹配IPHAS DR 2的历元，从而确保高自行物体被适当地交叉匹配。目录分别载有IPHAS和KIS的7，927，224和791，071个源。对于每个包含的源的>5-sigma视差检测的要求意味着1- 1.5 kpc的距离被很好地覆盖。我们为每个编目对象定义了两个额外的参数：（i）$f_c$，一个依赖于盖亚天体测量拟合质量的星等示踪剂;（ii）$f_{FP}$，视差测量的假阳性率，从给定质量的天体测量拟合确定在给定的星等。基于这些参数的选择切割可以用于以受控和合理的方式清洁颜色-量值和颜色-颜色图。我们提供完整版和轻量版的VAC，其中VAC-light仅包含代表我们建议的纯度和完整性之间权衡的对象。星表的用途包括在匹配的数据集中识别新的变星，以及由于从主序星中分离出高光度恒星而更完整地识别H-α过量发射天体。
英文摘要：
We present a sub-arcsecond cross-match of Gaia DR2 against the INT Photometric H-alpha 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 H-alpha 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 cross-matched. The catalogues contain 7,927,224 and 791,071 sources for IPHAS and KIS, respectively. The requirement of >5-sigma 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) $f_c$, a magnitude-dependent tracer of the quality of the Gaia astrometric fit; (ii) $f_{FP}$, 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 H-alpha-excess emission objects thanks to separation of high-luminosity stars from the main sequence.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
