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Title:
Correlations of optical and infrared excesses in T Tauri stars
Authors:
Hartigan, Patrick; Hartmann, Lee; Kenyon, Scott J.; Strom, Stephen E.; Skrutskie, Michael F.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AD(Massachusetts, University, Amherst), AE(Massachusetts, University, Amherst)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 354, May 1, 1990, p. L25-L28. Research supported by the Smithsonian Institution, NSF, and NASA. (ApJL Homepage)
Publication Date:
05/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Light Emission, Near Infrared Radiation, Stellar Radiation, T Tauri Stars, Accretion Disks, Boundary Layers, Cooling, Ionization, Radiative Transfer, Stellar Mass Accretion
DOI:
10.1086/185714
Bibliographic Code:
1990ApJ...354L..25H

Abstract

The results of a survey of excess optical continuum emission (veiling) in a sample of 35 K7-M1 pre-main-sequence stars in Taurus-Auriga are reported. Stars with detectable veiling emission always show significant near-infrared K-L excesses. This result agrees with the prediction of a simple accretion disk model, where a boundary layer produces the veiling and the infrared excess comes from the disk. The K-N colors of T Tauri stars fall into two distinct groups: stars in the group with small or absent K-N excesses have no detectable veiling emission, while objects with large K-N excesses usually have detectable veiling. This result also agrees with the prediction of the disk model, where a large K-N excess indicates an optically thick disk, and an optically thick disk is required to generate a mass accretion rate large enough to produce detectable veiling.

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