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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Citations
A High-Resolution Multiband Survey of Westerlund 2 With the Hubble Space Telescope. II. Mass accretion in the Pre-Main Sequence Population
Peter Zeidler,Peter Zeidler,Eva K. Grebel,Antonella Nota,Elena Sabbi,Anna Pasquali,Monica Tosi,Alceste Z. Bonanos,Carol Christian +8 more
TL;DR: In this article, a detailed analysis of the pre-main-sequence (PMS) population of the young star cluster Westerlund~2 (Wd2), the central ionizing cluster of the HII region RCW 49, using data from a high resolution multi-band survey with the Hubble Space Telescope was presented.
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Time evolution of a viscous protoplanetary disk with a free geometry: toward a more self-consistent picture
Kévin Baillié,Sébastien Charnoz +1 more
TL;DR: In this article, a viscous evolution hydrodynamical numerical code was developed to simultaneously determine the disk photosphere geometry and the midplane temperature, and the results of long-term simulations with a constrained geometry along the Chiang & Goldreich prescription (d lnH/d lnr = 9/7).
Magnetic torques on T Tauri stars: Accreting versus non-accreting systems
TL;DR: In this paper, the authors compare the magnetic braking due to stellar winds in two different systems: isolated (i.e., weak-line T T Tauri and main-sequence) and accreting stars.
Correlated optical and X-ray variability in CTTS - Indications of absorption-modulated emission
TL;DR: In this paper, the optical and X-ray fractional variability between the two 30 ks duration windows covered by both the Chandra and CoRoT observations, for a sample of classical and weak line T T Tauri stars (WTTSs) in NGC2264, was computed.
References
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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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