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An APEX study of molecular outflows in FUor-type stars
Fernando Cruz-Sáenz de Miera, Ágnes Kóspál, Péter Ábrahám +4
FU Orionis-type objects (FUors) are low-mass pre-main-sequence objects which go through a short-lived phase (~100 years) of increased mass accretion rate (from 10^-8 to 10^-4 M_sun…
Velocity resolved [O I] 63 m emission in the HD 50138 circumstellar disk
G. Sandell, C. Salyk, M. van den Ancker +5
HH 50138 is one of the brightest B[e] stars at a distance of 380 pc with strong infrared excess. The star was observed in [O I] 63 m and [C II] 158 m with high velocit…
SOFIA/GREAT Discovery of Terahertz Water Masers
David A. Neufeld, Gary J. Melnick, Michael J. Kaufman +6
We report the discovery of water maser emission at frequencies above 1 THz. Using the GREAT instrument on SOFIA, we have detected emission in the 1.296411 THz 8(27)-7(34) transitio…
Oxygen budget in low-mass protostars: the NGC1333-IRAS4A R1 shock observed in [OI] at 63 um with SOFIA-GREAT
L. E. Kristensen, A. Gusdorf, J. C. Mottram +5
In molecular outflows from forming low-mass protostars, most oxygen is expected to be locked up in water. However, Herschel observations have shown that typically an order of magni…
Cold CO gas in the envelopes of FU Orionis-type young eruptive stars
Á. Kóspál, P. Ábrahám, T. Csengeri +3
FUors are young stellar objects experiencing large optical outbursts due to highly enhanced accretion from the circumstellar disk onto the star. FUors are often surrounded by massi…
Infall through the evolution of high-mass star-forming clumps
F. Wyrowski, R. Güsten, K. M. Menten +6
With the GREAT receiver at the Stratospheric Observatory for Infrared Astronomy (SOFIA), nine massive molecular clumps have been observed in the ammonia line at 1.…