TY - JOUR
T1 - The Intermediate-mass Young Stellar Object 08576nr292: Discovery of A Disk-Jet System
AU - Ellerbroek, L.E.
AU - Kaper, L.
AU - Bik, A.
AU - de Koter, A.
AU - Horrobin, M.
AU - Puga, E.
AU - Sana, H.
AU - Waters, L.B.F.M.
PY - 2011
Y1 - 2011
N2 - We present observations of the embedded massive young stellar object (YSO) candidate 08576nr292, obtained
with X-shooter and SINFONI on the ESO Very Large Telescope (VLT). The flux-calibrated, medium-resolution
X-shooter spectrum (300–2500 nm) includes over 300 emission lines, but no (photospheric) absorption lines, and
is consistent with a reddened disk spectrum. Among the emission lines are three hydrogen series and helium lines,
both permitted and forbidden metal lines, and CO first-overtone emission. A representative sample of lines with
different morphologies is presented. The Hα and Ca ii triplet lines are very strong, with profiles indicative of outflow
and—possibly—infall, usually observed in accreting stars. These lines include a blueshifted absorption component
at∼−125 km s−1. TheHe i and metal-line profiles are double peaked, with a likely origin in a circumstellar disk. The
forbidden lines, associated with outflow, have a single blueshifted emission component centered at −125 km s−1,
coinciding with the absorption components in Hα and Ca ii. SINFONI H- and K-band integral-field spectroscopy
of the cluster environment demonstrates that the [Fe ii] emission is produced by a jet originating at the location of
08576nr292. Because the spectral type of the central object cannot be determined, its mass remains uncertain. We
argue that 08576nr292 is an intermediate-mass YSO with a high accretion rate ( ˙Macc ∼ 10−6–10−5M yr−1). These
observations demonstrate the potential of X-shooter and SINFONI to study in great detail an accretion disk–jet
system, rarely seen around the more massive YSOs.
AB - We present observations of the embedded massive young stellar object (YSO) candidate 08576nr292, obtained
with X-shooter and SINFONI on the ESO Very Large Telescope (VLT). The flux-calibrated, medium-resolution
X-shooter spectrum (300–2500 nm) includes over 300 emission lines, but no (photospheric) absorption lines, and
is consistent with a reddened disk spectrum. Among the emission lines are three hydrogen series and helium lines,
both permitted and forbidden metal lines, and CO first-overtone emission. A representative sample of lines with
different morphologies is presented. The Hα and Ca ii triplet lines are very strong, with profiles indicative of outflow
and—possibly—infall, usually observed in accreting stars. These lines include a blueshifted absorption component
at∼−125 km s−1. TheHe i and metal-line profiles are double peaked, with a likely origin in a circumstellar disk. The
forbidden lines, associated with outflow, have a single blueshifted emission component centered at −125 km s−1,
coinciding with the absorption components in Hα and Ca ii. SINFONI H- and K-band integral-field spectroscopy
of the cluster environment demonstrates that the [Fe ii] emission is produced by a jet originating at the location of
08576nr292. Because the spectral type of the central object cannot be determined, its mass remains uncertain. We
argue that 08576nr292 is an intermediate-mass YSO with a high accretion rate ( ˙Macc ∼ 10−6–10−5M yr−1). These
observations demonstrate the potential of X-shooter and SINFONI to study in great detail an accretion disk–jet
system, rarely seen around the more massive YSOs.
U2 - 10.1088/2041-8205/732/1/L9
DO - 10.1088/2041-8205/732/1/L9
M3 - Article
SN - 2041-8205
VL - 732
JO - Astrophysical journal. Letters
JF - Astrophysical journal. Letters
IS - 1
ER -