Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310402h&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #104.02; Bulletin of the American Astronomical Society, Vol. 30, p.1406
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We present moderate resolution (R = 2000), high signal-to-noise (S/N > 80) near-infared spectra of five galactic center He I emission-line stars. The nature of these stars has been difficult to ascertain in previous studies because they relied on emission features arising in the stellar wind, predominately in the 2 micron range, to determine the effective photospheric temperature. Three of the five He I emission-line stars we observed showed the 1.700 micron He I line in absorption. We argue that these three stars have less developed winds and are less evolved than the remaining broad-lined, He I emission-line stars studied previously. Instead, our three stars are better compared to normal, albeit highly luminous, B supergiant stars. We explore a possible explanation for the extremely high luminosity of the galactic center stars by applying recently developed evolutionary tracks for massive stars with high rotation.
Hanson Margaret Murray
Rieke George H.
Tamblyn Peter
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