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Paper: Evidence for a Feedback Relationship Between Mass Accretion and Inner Disk Properties
Volume: 448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Page: 597
Authors: Deen, C. P.; Jaffe, D. T.
Abstract: Observations of young stellar objects frequently show evidence for mass accretion and for warm, dusty circumstellar disks. The fraction of objects in a cluster showing near-IR emission from circumstellar disks (Haisch et al. 2001; Mamajek 2009) or mass accretion (Fedele et al. 2010) decreases as a function of cluster age. These cluster studies derive similar timescales (∼ 3–5 Myr) for the cessation of accretion and the dissipation of the inner parts of circumstellar disks, suggesting a connection between the two phenomena. We examine medium resolution spectroscopic infrared observations of a sample of M dwarf YSOs in Ophiuchus, from which we derive spectral types, accretion luminosities, and K-band veilings. We find a strong and steep correlation between the specific accretion luminosity and measured K-band veiling. One explanation for this correlation is a feedback mechanism where the UV photons generated by the accretion flow alter conditions in the disk in a way that encourages further accretion.
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