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Title: CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs

Abstract

New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the program operated. For 124 of the stars, parallax determinations from other investigators have already appeared in the literature and we compare the different results. Also included here are new or updated VI photometry on the Johnson–Kron-Cousins system for all but a few of the faintest targets. Together with 2MASS JHK{sub s} near-infrared photometry, a sample of absolute magnitude versus color and color versus color diagrams are constructed. Because large proper motion was a prime criterion for targeting the stars, the majority turn out to be either M-type subdwarfs or late M-type dwarfs. The sample also includes 50 dwarf or subdwarf L-type stars, and four T dwarfs. Possible halo subdwarfs are identified in the sample based on tangential velocity, subluminosity, and spectral type. Residuals from the solutions for parallax and proper motion for several stars show evidence of astrometric perturbations.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5]
  1. US Naval Observatory, Flagstaff Station, 10391 W. Naval Observatory Road, Flagstaff, AZ 86005-8521 (United States)
  2. L-3 Communications/Brashear, 615 Epsilon Drive, Pittsburgh, PA 15238-2807 (United States)
  3. AAVSO, Cambridge, MA 02138 (United States)
  4. Gemini Observatory, Northern Operations Center, 670 N. A’ohoku Place, Hilo, HI 96720 (United States)
  5. Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001-4499 (United States)
Publication Date:
OSTI Identifier:
22663145
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 154; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHARGE-COUPLED DEVICES; COLOR; COMPARATIVE EVALUATIONS; DIAGRAMS; DISTANCE; DISTURBANCES; DWARF STARS; NEAR INFRARED RADIATION; PHOTOMETRY; PROPER MOTION; VELOCITY

Citation Formats

Dahn, Conard C., Harris, Hugh C., Subasavage, John P., Ables, Harold D., Guetter, Harry H., Harris, Fred H., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Munn, Jeffrey A., Pier, Jeffrey R., Stone, Ronald C., Vrba, Frederick J., Walker, Richard L., Tilleman, Trudy M., Canzian, Blaise J., Henden, Arne H., Leggett, S. K., and Levine, Stephen E., E-mail: jsubasavage@nofs.navy.mil. CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA880B.
Dahn, Conard C., Harris, Hugh C., Subasavage, John P., Ables, Harold D., Guetter, Harry H., Harris, Fred H., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Munn, Jeffrey A., Pier, Jeffrey R., Stone, Ronald C., Vrba, Frederick J., Walker, Richard L., Tilleman, Trudy M., Canzian, Blaise J., Henden, Arne H., Leggett, S. K., & Levine, Stephen E., E-mail: jsubasavage@nofs.navy.mil. CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs. United States. doi:10.3847/1538-3881/AA880B.
Dahn, Conard C., Harris, Hugh C., Subasavage, John P., Ables, Harold D., Guetter, Harry H., Harris, Fred H., Luginbuhl, Christian B., Monet, Alice B., Monet, David G., Munn, Jeffrey A., Pier, Jeffrey R., Stone, Ronald C., Vrba, Frederick J., Walker, Richard L., Tilleman, Trudy M., Canzian, Blaise J., Henden, Arne H., Leggett, S. K., and Levine, Stephen E., E-mail: jsubasavage@nofs.navy.mil. Sun . "CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs". United States. doi:10.3847/1538-3881/AA880B.
@article{osti_22663145,
title = {CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs},
author = {Dahn, Conard C. and Harris, Hugh C. and Subasavage, John P. and Ables, Harold D. and Guetter, Harry H. and Harris, Fred H. and Luginbuhl, Christian B. and Monet, Alice B. and Monet, David G. and Munn, Jeffrey A. and Pier, Jeffrey R. and Stone, Ronald C. and Vrba, Frederick J. and Walker, Richard L. and Tilleman, Trudy M. and Canzian, Blaise J. and Henden, Arne H. and Leggett, S. K. and Levine, Stephen E., E-mail: jsubasavage@nofs.navy.mil},
abstractNote = {New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the program operated. For 124 of the stars, parallax determinations from other investigators have already appeared in the literature and we compare the different results. Also included here are new or updated VI photometry on the Johnson–Kron-Cousins system for all but a few of the faintest targets. Together with 2MASS JHK{sub s} near-infrared photometry, a sample of absolute magnitude versus color and color versus color diagrams are constructed. Because large proper motion was a prime criterion for targeting the stars, the majority turn out to be either M-type subdwarfs or late M-type dwarfs. The sample also includes 50 dwarf or subdwarf L-type stars, and four T dwarfs. Possible halo subdwarfs are identified in the sample based on tangential velocity, subluminosity, and spectral type. Residuals from the solutions for parallax and proper motion for several stars show evidence of astrometric perturbations.},
doi = {10.3847/1538-3881/AA880B},
journal = {Astronomical Journal (Online)},
number = 4,
volume = 154,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}