Computer Science
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..207d&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Computer Science
Line: Formation, Stars: Early-Type, Fundamental Parameters, Turbulence
Scientific paper
We present observations of the bra, brb\ and pfa\ lines of 16 dwarf and (sub)giant stars in the spectral range O9-B3. The observations were done using SWS, and have a signal-to-noise of ~ 20 to >150 and a resolving power varying from ~ 1500 to 2000. We compare the equivalent widths of these lines with predictions using non-LTE model atmospheres to investigate to what extent these infrared lines can be used to derive effective temperatures. We find that pfa\ is a sensitive Teff diagnostic for the range of spectral types investigated, and bra\ for types O9-B2, yielding agreement with optical results to within 1-4 kK or one-three spectral sub-types. We find evidence for a gradient in the turbulent velocity in the atmospheres of these stars, increasing from <~ 5 kmsec\ for the atmospheric region in which bra\ is formed to ~ 15 kmsec\ for the regime where pfa\ originates. If this gradient is taken into account, the accuracy of the spectral type calibration is improved to ~ 1-2 kK or one to one and a half spectral sub-types.
de Koter Alex
Lenorzer Annique
Waters Laurens B. F. M.
Zaal P. A.
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