Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.4305l&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #43.05; Bulletin of the American Astronomical Society, Vol. 32, p.1469
Astronomy and Astrophysics
Astronomy
Scientific paper
As part of an ongoing project to identify hot massive stars in highly obscured regions of the Galaxy (see also Simpson, Cotera, and Leistra this meeting), we have used the Steward Observatory Bok 2.3 m telescope with the 256X256 near-infrared camera to obtain broadband H and K band images and with FSPEC to obtain spectra within several regions of the Giant HII Region W51. The areas observed correspond to radio emission peaks within the region. The observations were taken in May-June 2000. Once the broadband images were obtained, areas that contained either diffuse broad band emission or stellar clusters were selected for spectral observation. Spectral scans were taken at R ~ 1000 by fixing the slit in RA and stepping at 1.5'' intervals in Dec across the regions of interest, creating cubes of data with axes α , δ and λ . Candidates for deeper spectra were identified by extracting the Brγ (2.166 μ m) and He I (2.058 μ m) emission line images from the data cubes. Emission line images made during similar observations in 1998 were also used to identify candidate objects for higher resolution spectra. At least two candidate hot massive stars in a previously unknown stellar cluster in the G49.4-0.3a component of W51 have been identified. Their spectra contain several He II emission lines in addition to Brγ and He I (2.058 & 2.112/3 μ m) lines, which are undoubtably contaminated by nebular emission. The 2.189 μ m line, usually the strongest He II emission line in this spectral region in WR stars, was not observed, but observing He II in O stars is problematic. We will present a preliminary classification of these unusual stars based on their H and K band spectra.
Cotera Angela
Leistra A.
Simpson Jamesina J.
No associations
LandOfFree
Massive Luminous Stars in the Galactic HII Region W51 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Massive Luminous Stars in the Galactic HII Region W51, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive Luminous Stars in the Galactic HII Region W51 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1724093