Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0205050)
· References in the article
· Citations to the Article (306) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (85)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
Authors:
Dahn, Conard C.; Harris, Hugh C.; Vrba, Frederick J.; Guetter, Harry H.; Canzian, Blaise; Henden, Arne A.; Levine, Stephen E.; Luginbuhl, Christian B.; Monet, Alice K. B.; Monet, David G.; Pier, Jeffrey R.; Stone, Ronald C.; Walker, Richard L.; Burgasser, Adam J.; Gizis, John E.; Kirkpatrick, J. Davy; Liebert, James; Reid, I. Neill
Affiliation:
AA(), AB(), AC(), AD(), AE(), AF(Universities Space Research Association.), AG(), AH(), AI(), AJ(US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149), AK(US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149), AL(US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149), AM(US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002-1149), AN(Department of Astronomy and Astrophysics, UCLA, 8965 Math Sciences Building, Los Angeles, CA 90095-1562), AO(Department of Physics and Astronomy, University of Delaware, Newark, DE 19716), AP(Infrared Processing and Analysis Center, MS 100-22, Pasadena, CA 91125), AQ(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721), AR(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218)
Publication:
The Astronomical Journal, Volume 124, Issue 2, pp. 1170-1189. (AJ Homepage)
Publication Date:
08/2002
Origin:
UCP
AJ Keywords:
Astrometry, Stars: Color-Magnitude Diagrams, Stars: Distances, Stars: Late-Type, Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/341646
Bibliographic Code:
2002AJ....124.1170D

Abstract

Trigonometric parallax determinations are presented for 28 late-type dwarfs and brown dwarfs, including eight M dwarfs with spectral types between M7 and M9.5, 17 L dwarfs with spectral types between L0 and L8, and three T dwarfs. Broadband photometry at CCD wavelengths (VRIz*) and/or near-IR wavelengths (JHK) is presented for these objects and for 24 additional late-type dwarfs. Supplemented with astrometry and photometry from the literature, including 10 L and two T dwarfs with parallaxes established by association with bright, usually Hipparcos primaries, this material forms the basis for studying various color-color and color-absolute magnitude relations. The I-J color is a good predictor of absolute magnitude for late M and L dwarfs. MJ becomes monotonically fainter with I-J color and with spectral type through late L dwarfs, then brightens for early T dwarfs. The combination of z*JK colors alone can be used to classify late M, early L, and T dwarfs accurately, as well as to predict their absolute magnitudes, but is less effective at untangling the scatter among mid- and late L dwarfs. The mean tangential velocity of these objects is found to be slightly less than that for dM stars in the solar neighborhood, consistent with a sample with a mean age of several Gyr. Using colors to estimate bolometric corrections and models to estimate stellar radii, effective temperatures are derived. The latest L dwarfs are found to have Teff~1360 K.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints