A technique to derive improved proper motions for kepler objects of interest

Benedict, G. Fritz and Tanner, Angelle M. and Cargile, Phillip A. and Ciardi, David R. (2014) A technique to derive improved proper motions for kepler objects of interest. The Astronomical Journal, 148 (6). pp. 108-134. ISSN 0004-6256

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Abstract

We outline an approach yielding proper motions with higher precision than exists in present catalogs for a sample of stars in the Kepler field. To increase proper-motion precision, we combine first-moment centroids of Kepler pixel data from a single season with existing catalog positions and proper motions. We use this astrometry to produce improved reduced-proper-motion diagrams, analogous to a Hertzsprung-Russell (H-R) diagram, for stars identified as Kepler objects of interest. The more precise the relative proper motions, the better the discrimination between stellar luminosity classes. Using UCAC4 and PPMXL epoch 2000 positions (and proper motions from those catalogs as quasi-Bayesian priors), astrometry for a single test Channel (21) and Season (0) spanning 2 yr yields proper motions with an average per-coordinate proper-motion error of 1.0 mas yr-1, which is over a factor of three better than existing catalogs. We apply a mapping between a reduced-proper-motion diagram and an H-R diagram, both constructed using Hubble Space Telescope parallaxes and proper motions, to estimate Kepler object of interest K-band absolute magnitudes. The techniques discussed apply to any future small-field astrometry as well as to the rest of the Kepler field.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	Access to published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre:	No Faculty
Faculty/School / Institute/Centre:	No Faculty
Date Deposited:	11 Jun 2017 22:59
Last Modified:	30 Oct 2017 01:29
Uncontrolled Keywords:	astrometry; planetary systems; proper motions; stars: distances;
Fields of Research (2008):	02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
Socio-Economic Objectives (2008):	E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI:	https://doi.org/10.1088/0004-6256/148/6/108
URI:	http://eprints.usq.edu.au/id/eprint/32200

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