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Title: The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 parsec White Dwarf Sample

Abstract

We present 114 trigonometric parallaxes for 107 nearby white dwarf (WD) systems from both the Cerro Tololo Inter-American Observatory Parallax Investigation (CTIOPI) and the U. S. Naval Observatory Flagstaff Station (NOFS) parallax programs. Of these, 76 parallaxes for 69 systems were measured by the CTIOPI program and 38 parallaxes for as many systems were measured by the NOFS program. A total of 50 systems are confirmed to be within the 25-pc horizon of interest. Coupled with a spectroscopic confirmation of a common proper-motion companion to a Hipparcos star within 25 pc as well as confirmation parallax determinations for two WD systems included in the recently released Tycho Gaia Astrometric Solution catalog, we add 53 new systems to the 25-pc WD sample—a 42% increase. Our sample presented here includes four strong candidate halo systems, a new metal-rich DAZ WD, a confirmation of a recently discovered nearby short-period ( P  = 2.85 hr) double degenerate, a WD with a new astrometric perturbation (long period, unconstrained with our data), and a new triple system where the WD companion main-sequence star has an astrometric perturbation ( P  ∼ 1.6 year).

Authors:
; ;  [1]; ;  [2]; ;  [3]; ;  [4];  [5];  [6];  [7]
  1. U.S. Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86005-8521 (United States)
  2. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 (United States)
  3. RECONS Institute, Chambersburg, PA 17201 (United States)
  4. Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7 (Canada)
  5. University of North Carolina at Chapel Hill, Dept. of Physics and Astronomy, Chapel Hill, NC 27599 (United States)
  6. Department of Physics, High Point University, One University Parkway, High Point, NC 27268 (United States)
  7. Gemini Observatory, Southern Operations Center, Casilla 603, La Serena (Chile)
Publication Date:
OSTI Identifier:
22663128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 154; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; DISTANCE; DISTURBANCES; GALAXIES; MAIN SEQUENCE STARS; METALS; PROPER MOTION; STAR EVOLUTION; WHITE DWARF STARS

Citation Formats

Subasavage, John P., Harris, Hugh C., Dahn, Conard C., Jao, Wei-Chun, Lépine, Sébastien, Henry, Todd J., Ianna, Philip A., Bergeron, P., Dufour, P., Dunlap, Bart H., Barlow, Brad N., and Margheim, Steven J., E-mail: jsubasavage@nofs.navy.mil. The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 parsec White Dwarf Sample. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA76E0.
Subasavage, John P., Harris, Hugh C., Dahn, Conard C., Jao, Wei-Chun, Lépine, Sébastien, Henry, Todd J., Ianna, Philip A., Bergeron, P., Dufour, P., Dunlap, Bart H., Barlow, Brad N., & Margheim, Steven J., E-mail: jsubasavage@nofs.navy.mil. The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 parsec White Dwarf Sample. United States. doi:10.3847/1538-3881/AA76E0.
Subasavage, John P., Harris, Hugh C., Dahn, Conard C., Jao, Wei-Chun, Lépine, Sébastien, Henry, Todd J., Ianna, Philip A., Bergeron, P., Dufour, P., Dunlap, Bart H., Barlow, Brad N., and Margheim, Steven J., E-mail: jsubasavage@nofs.navy.mil. Sat . "The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 parsec White Dwarf Sample". United States. doi:10.3847/1538-3881/AA76E0.
@article{osti_22663128,
title = {The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 parsec White Dwarf Sample},
author = {Subasavage, John P. and Harris, Hugh C. and Dahn, Conard C. and Jao, Wei-Chun and Lépine, Sébastien and Henry, Todd J. and Ianna, Philip A. and Bergeron, P. and Dufour, P. and Dunlap, Bart H. and Barlow, Brad N. and Margheim, Steven J., E-mail: jsubasavage@nofs.navy.mil},
abstractNote = {We present 114 trigonometric parallaxes for 107 nearby white dwarf (WD) systems from both the Cerro Tololo Inter-American Observatory Parallax Investigation (CTIOPI) and the U. S. Naval Observatory Flagstaff Station (NOFS) parallax programs. Of these, 76 parallaxes for 69 systems were measured by the CTIOPI program and 38 parallaxes for as many systems were measured by the NOFS program. A total of 50 systems are confirmed to be within the 25-pc horizon of interest. Coupled with a spectroscopic confirmation of a common proper-motion companion to a Hipparcos star within 25 pc as well as confirmation parallax determinations for two WD systems included in the recently released Tycho Gaia Astrometric Solution catalog, we add 53 new systems to the 25-pc WD sample—a 42% increase. Our sample presented here includes four strong candidate halo systems, a new metal-rich DAZ WD, a confirmation of a recently discovered nearby short-period ( P  = 2.85 hr) double degenerate, a WD with a new astrometric perturbation (long period, unconstrained with our data), and a new triple system where the WD companion main-sequence star has an astrometric perturbation ( P  ∼ 1.6 year).},
doi = {10.3847/1538-3881/AA76E0},
journal = {Astronomical Journal (Online)},
number = 1,
volume = 154,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}