High Spatial Resolution Spectroscopy of W51 IRS2E and IRS2W: Two Very Massive Young Stars in Early Formation Stages
arXiv:0803.3853 · doi:10.1086/588500
Abstract
We present -band spectra of the near infrared counterparts to IRS2E and IRS2W which is associated with the ultracompact HII region W51d, both of them embedded sources in the Galactic compact HII region W51 IRS2. The high spatial resolution observations were obtained with the laser guide star facility and Near infrared Integral Field Spectrograph (NIFS) mounted at the Gemini North observatory. The spectrum of the ionizing source of W51d shows the photospheric features NIII (21155 Å) in emission and HeII (21897 Å) in absorption which lead us to classify it as an young O3 type star. We detected CO overtone in emission at 23000 Åin the spectrum of IRS2E, suggesting that it is a massive young object still surrounded by an accretion disc, probably transitioning from the hot core phase to an ultracompact HII region.
Accepted by ApJ Letters
References in corpus (12)
- Toward Understanding Massive Star Formation
- A new calibration of stellar parameters of Galactic O stars
- A Medium Resolution Near-Infrared Spectral Atlas of O and Early B Stars
- Kinematic Diagnostics of Disks Around Young Stars: CO Overtone Emission from WL16 and 1548C27
- Evidence for an inner molecular disk around massive Young Stellar Objects
- VLT K-band spectroscopy of massive young stellar objects in (ultra-)compact HII regions
- VLT K-band spectroscopy of massive stars deeply embedded in IRAS sources with UCHII colours
- Embedded Star Clusters in the W51 Giant Molecular Cloud
- Near Infrared Spectroscopy of G29.96-0.02: The First Spectral Classification of the Ionizing Star of an Ultracompact HII Region
- Accretion Signatures from Massive Young Stellar Objects
- 3-D Kinematics of Water Masers in the W51A Region
- Gemini Mid-Infrared Imaging of Massive Young Stellar Objects in NGC 3576
Cited by in corpus (19)
- Trigonometric Parallax of W51 Main/South
- Trigonometric Parallaxes of Massive Star Forming Regions: III. G59.7+0.1 and W 51 IRS2
- Spectrophotometric Distances to Galactic H\,{\sc{ii}} Regions
- Thermal Feedback in the high-mass star and cluster forming region W51
- Toward gas exhaustion in the W51 high-mass protoclusters
- A ring/disk/outflow system associated with W51 North: a very massive star in the making
- PROFIT: a new alternative for emission-line PROfile FITting
- The P Cygni supergiant [OMN2000] LS1 - implications for the star formation history of W51
- On the Gaia DR2 distances for Galactic Luminous Blue Variables
- Extremely large and hot multilayer Keplerian disk around the O-type protostar W51N: The precursors of the HCHII regions?
- Young Stellar Objects in the Massive Star-Forming Regions W51 and W43
- Dust continuum and Polarization from Envelope to Cores in Star Formation: A Case Study in the W51 North region
- Revealing a new symbiotic X-ray binary with Gemini NIFS
- Near-infrared spectroscopy of the massive stellar population of W51: evidence for multi-seeded star formation
- Mid-Infrared diagnostics of metal-rich HII regions from VLT and Spitzer Spectroscopy of Young Massive Stars in W31
- Mid Infrared View of the High Mass Star Formation Region W51A
- Extended Ionized Fe Objects in the UWIFE Survey
- High Angular Resolution Imaging Spectroscopy of the Galactic Ultra-Compact HII Region K3-50A
- GTC/CanariCam Mid-IR Polarimetry of Magnetic Fields in Star-Forming Region W51 IRS2