THE INTERMEDIATE-MASS YOUNG STELLAR OBJECT 08576nr292: DISCOVERY OF A DISK-JET SYSTEM

Journal Article · Sun May 01 04:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/732/1/L9· OSTI ID:21562711

Ellerbroek, Lucas E; Kaper, Lex; De Koter, Alex; Sana, Hugues; Bik, Arjan ^[1]; Horrobin, Matthew ^[2]; Puga, Elena ^[3]

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1. Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg (Germany)
2. I. Physikalisches Institut, Universitaet zu Koeln, 50937 Koeln (Germany)
3. Instituut voor Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven (Belgium)

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 H{alpha} 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 {approx}-125 km s{sup -1}. The He 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{sup -1}, coinciding with the absorption components in H{alpha} 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 ( M-dot{sub acc}{approx}10{sup -6}-10{sup -5} M{sub sun} yr{sup -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.

• OSTI ID: 21562711
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 732; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCRETION DISKS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
EMISSION
FLUIDS
GASES
HELIUM
HYDROGEN
JETS
MASS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
STARS