Abstract
view Abstract Citations (147) References (57) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Flat Spectrum T Tauri Stars: The Case for Infall Calvet, Nuria ; Hartmann, Lee ; Kenyon, S. J. ; Whitney, B. A. Abstract We show that the mid- to far-infrared fluxes of 'flat spectrum' T Tauri stars can be explained by radiative equilibrium emission from infalling dusty envelopes. Infall eliminates the need for accretion disks with non-standard temperature distributions. The simplicity and power of this explanantion indicates that models employing 'active' disks, in which the temperature distribution is a parameterized power law, should be invoked with caution. Infall also naturally explains the scattered light nebulae detected around many flat spectrum sources. To match the observed spectra, material must fall onto a disk rather than the central star, as expected for collapse of a rotating molecular cloud. It may be necessary to invoke cavities in the envelopes to explain the strength of optical and near-infrared emission; these cavities could be produced by the powerful bipolar outflows commonly observed from young stars. If viewed along the cavity, a source may be lightly extincted at visual wavelengths, while still accreting substantial amounts of material from the envelope. Infall may also be needed to explain the infrared-bright companions of many optical T Tauri stars. This picture suggests that many of the flat spectrum sources are 'protostars'-young stellar objects surrounded by dust infalling envelopes of substantial mass. Publication: The Astrophysical Journal Pub Date: October 1994 DOI: 10.1086/174731 Bibcode: 1994ApJ...434..330C Keywords: Flux Density; Infrared Astronomy; Infrared Radiation; Infrared Spectra; Radiative Transfer; Stellar Envelopes; Stellar Mass Accretion; T Tauri Stars; Accretion Disks; Nebulae; Stellar Mass Ejection; Stellar Models; Stellar Spectra; Temperature Distribution; Astrophysics; ACCRETION; ACCRETION DISKS; INFRARED: STARS; LINE: FORMATION; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (3)
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