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HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries

van Belle, Gerard T. and Schaefer, Gail H. and von Braun, Kaspar and Nelan, Edmund P. and Hartman, Zachary and Boyajian, Tabetha S. and López-Morales, Mercedes and Ciardi, David R. (2020) HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries. Publications of the Astronomical Society of the Pacific, 132 (1011). Art. No. 054201. ISSN 0004-6280. doi:10.1088/1538-3873/ab7b91.

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Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) trigonometric parallax observations were obtained to directly determine distances to five nearby M-dwarf/M-dwarf eclipsing binary systems. These systems are intrinsically interesting as benchmark systems for establishing basic physical parameters for low-mass stars, such as luminosity L, and radius R. HST/FGS distances are also one of the few direct checks on Gaia trigonometric parallaxes, given the comparable sensitivity in both magnitude limit and determination of parallactic angles. A spectral energy distribution (SED) fit of each system's blended flux output was carried out, allowing for estimation of the bolometric flux from the primary and secondary components of each system. From the stellar M, L, and R values, the low-mass star relationships between L and M, and R and M, are compared against idealized expectations for such stars. An examination on the inclusion of these close M-dwarf/M-dwarf pairs in higher-order common proper motion (CPM) pairs is analyzed; each of the 5 systems has indications of being part of a CPM system. Unexpected distances on interesting objects found within the grid of parallactic reference stars are also presented, including a nearby M dwarf and a white dwarf.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
van Belle, Gerard T.0000-0002-8552-158X
Schaefer, Gail H.0000-0001-5415-9189
von Braun, Kaspar0000-0002-5823-4630
Nelan, Edmund P.0000-0002-5704-5221
Hartman, Zachary0000-0003-4236-6927
Boyajian, Tabetha S.0000-0001-9879-9313
López-Morales, Mercedes0000-0003-3204-8183
Ciardi, David R.0000-0002-5741-3047
Additional Information:© 2020 The Astronomical Society of the Pacific. Received 2020 January 15; accepted 2020 March 2; published 2020 April 2. We would like to thank Andy Boden of Caltech for his development of the sedFit software suite, which was instrumental in deriving these results. We would also like to acknowledge our anonymous referee, who made many positive suggestions for improving this manuscript. Support for this work was provided by NASA through grant GO-11213 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This publication makes use of data products from the Two-Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/Caltech, funded by NASA and the NSF. This research has utilized the SIMBAD database and VizieR catalog access tool, both operated at CDS, Strasbourg, France (Ochsenbein et al. 2000; Wenger et al. 2000), and the NASA's Astrophysics Data System Bibliographic Services. Facilities: HST-FGS, Gaia, WIYN-HYDRA, Lowell: 31 inch USGS telescope, 42 inch Hall telescope. Software: sedFit, GaussFit, IRAF DOHYDRA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:astrometry – binaries: eclipsing – stars: distances – stars: fundamental parameters – stars: individual (GU Boo, YY Gem, CM Dra, NSVS01031772, TrES-Her0-07621) – stars: low-mass – techniques: interferometric
Issue or Number:1011
Record Number:CaltechAUTHORS:20200430-131409149
Persistent URL:
Official Citation:Gerard T. van Belle et al 2020 PASP 132 054201
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102934
Deposited By: Tony Diaz
Deposited On:30 Apr 2020 20:26
Last Modified:16 Nov 2021 18:16

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