1994/02/22 by Huib Jan van Langevelde, Ewine F. van Dishoeck, Geoffrey A. Blake · 1 citation
Chemistry · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Fullerene Chemistry and Applications #astro-ph
paper · pdf · doi:10.1086/187307
9 pages, uuencoded PostScript file, including figures
arxiv created 1994/02/22 · openalex publication_date 1994/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
High spectral and spatial resolution observations of the HCO+ molecule toward the T Tau binary system obtained with the Owens Valley Millimeter Array reveal a broad emission line profile (VLSR = 7.2 km/s, width = 2.0 km/s) upon which a narrow, redshifted absorption feature (VLSR = 8.5 km/s, width +/- 0.5 km/s) is superposed. One possible interpretation of the absorption is that it arises from infall of molecular cloud envelope material onto the immediate circumbinary region, which would imply that large scale dynamic accretion processes are still active well into the optically visible stages of star formation. Provided the mass is deposited at radii sufficiently close to the young stars, estimates of the accretion rates indicate that infall may add enough material to the system to account for the FU~Orionis type flares recently observed in T~Tau in =< 100 yr.