A technique to derive improved proper motions for kepler objects of interest
Article
Article Title | A technique to derive improved proper motions for kepler objects of interest |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Benedict, G. Fritz (Author), Tanner, Angelle M. (Author), Cargile, Phillip A. (Author) and Ciardi, David R. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 148 (6), pp. 108-134 |
Article Number | 108 |
Number of Pages | 17 |
Year | 2014 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-6256/148/6/108 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-6256/148/6/108 |
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. |
Keywords | astrometry; planetary systems; proper motions; stars: distances; |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | University of Texas at Austin, United States |
Mississippi State University, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4356/a-technique-to-derive-improved-proper-motions-for-kepler-objects-of-interest
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