Journal Article10.1086/305032
Disk accretion rates for T tauri stars
Erik Gullbring,Lee Hartmann,Cesar Briceno,Cesar Briceno,Cesar Briceno,Nuria Calvet,Nuria Calvet +6 more
TL;DR: In this paper, the authors present new measurements of disk accretion rates for T Tauri stars in the Taurus molecular cloud complex, which are based on intermediate-resolution spectrophotometry from 3200 to 5200 A, and derive the excess hot continuum emission produced by accretion onto the central star.
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Abstract: We present new measurements of disk accretion rates for T Tauri stars in the Taurus molecular cloud complex. Our results are based on intermediate-resolution spectrophotometry from 3200 to 5200 A, which is used to derive the excess hot continuum emission produced by accretion onto the central star. Previous estimates of T Tauri accretion rates in the literature differ by as much as 1 order of magnitude; our measurements agree better with the lowest estimates, and we discuss the problems and systematic effects that led to the previous disagreement. In particular, we note that the stellar photospheric emission from nonaccreting T Tauri stars exhibits color anomalies compared to main-sequence stars; these anomalies make the estimated extinction depend upon the color index used. We argue that the V-R index is a reasonable compromise to match with optically derived spectral types, and that V-I and V-J are much more likely to be biased by cooler companion stars and starspots. We develop a calibration with which approximate mass accretion rates can be derived for T Tauri stars based on broadband photometry and spectral types, which should enable accretion rates to be estimated for large samples with greater ease.
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References
Interstellar dust and extinction
TL;DR: The ultraviolet (UV) region of the spectrum has been crucial in providing information on the nature of the material and size distribution of the particles of interstellar dust before there were any measurements of the UV properties of interstellar extinction as mentioned in this paper.
1.5K
Accretion by rotating magnetic neutron stars. III. Accretion torques and period changes in pulsating X-ray sources.
Pranab Ghosh,F. K. Lamb +1 more
TL;DR: In this article, the solutions of the two-dimensional hydromagnetic equations are used to calculate the torque on a magnetic neutron star accreting from a Keplerian disk, revealing that the magnetic coupling between the star and the plasma in the outer transition zone is appreciable; as a result, the spin-up torque on fast rotators is substantially less than that on slow rotators, and that for sufficiently high stellar angular velocities or sufficiently low mass accretion rates, the rotation of the star can be braked while accretion continues.
1.1K
Disk accretion onto magnetic T Tauri stars
TL;DR: In this article, the dynamical and radiative consequences of disk accretion onto magnetic T T Tauri stars (TTS) were examined using the Ghosh and Lamb model, and it was shown that a prolonged disk accuration phase is compatible with the low rotation rates measured in these stars if they possess a kilogauss strength field that disrupts the disk at a distance of a few stellar radii from the center.
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