Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..603b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, P. 603-616
Mathematics
Logic
73
Astronomical Models, Early Stars, Galactic Nuclei, Helium, Infrared Spectra, Line Spectra, Milky Way Galaxy, Accretion Disks, Data Reduction, Hertzsprung-Russell Diagram, Magellanic Clouds, Spectrum Analysis, Stellar Mass Ejection
Scientific paper
We present R approximately = 570 resolution K band spectra of eight sources in the Galactic center, including four sources within the IRS 16 cluster, IRS 13, IRS 1 W, and the compact He I emission-line sources AF (also known as AHH) and AHH NW. We also present R approximately = 570 H and K band spectra of the AF source and nine galactic and large magellanic cloud (LMC) early-type mass-losing stars, including Ofpe/WN9, WN, and LBV stars. The spectra of both the Galactic center sources and the comparison stars show a wide range of behavior in the He I (1.70 micrometer, 2.06 micrometer, 2.11 micrometer) and H I (Brackett series)lines. While the Galactic center and companion star spectra show some morphological similarities, we find significantly larger He I equivalent widths in the AF source and two galactic early-type mass-losing stars than in any of the LMC stars. Several of the Galactic center He I sources are found to have higher He I velocity widths than any of the galactic or LMC early-type mass-losing stars. At least one source, IRS 13, shows significant emission to the red of the He I 2.06 micrometer line emission, which may be a red wing to this line or a blend of other unidentified lines. We also rule the Galactic center He I sources normal OB giant/supergiants, WC, or WN7-8 stars based on comparison of our spectra to published spectra of these types. We estimate the BCK = Mbol - MK for the Galactic center sources as a function of effective temperature from published data on LBV, WN9, and Ofpe/WN9 stars, and use limits on the effective temperature to place the Galactic center sources in the H-R diagram.
Blum Robert David
DePoy Darren L.
Sellgren Kris
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