Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nasrp1363.....w&link_type=abstract
NASA Ref. Publ., 1363 (1995)
Astronomy and Astrophysics
Astronomy
27
Astronomical Spectroscopy, B Stars, Radiation Distribution, Stellar Luminosity, Stellar Spectra, Stellar Winds, Ultraviolet Spectra, Ultraviolet Spectroscopy, Absorption Spectra, Classifications, High Resolution, Iue, Spectral Resolution, Spectrograms, Tables (Data), Ultraviolet Emission
Scientific paper
An Atlas of B-type spectra observed at high resolution by the International Ultraviolet Explorer is presented. It is designed to complement the widely used O-type Atlas (NASA RP-1155). The purpose is to complete the OB natural group, i.e., to spectral type B3 on the main sequence and B8 at luminosity class Ia, in order to chart the gradual disappearance of the stellar-wind features in normal spectra as a function of spectral type and luminosity class. As in the O Atlas, the primary selection criterion is well-defined optical classifications to derive a consistent ultraviolet (UV) reference frame of normal objects. Some peculiar categories are also included, particularly types BN/BC and superluminous objects. Spectrograms of 86 stars are arranged in 20 spectral-type, luminosity-class, or peculiar-object sequences. The processing and presentation are similar to the O Atlas: the 1200-l900 A range has been rectified, rebinned to a uniform resolution of 0.25A, and plotted at 10 A/cm. The conclusions from the B Atlas are similar to those from the O Atlas, namely, that the UV stellar-wind features display strong systematic trends as a function of spectral type and luminosity class, and a high degree of correlation with the optical classifications as the winds decline toward the later types. A somewhat higher rate of exceptions to these correlations can be recognized among the B spectra (11 percent) than the O (2 percent), but they remain a small fraction of the total sample and do not prevent clear delineation of the normal behavior. Indeed, it is only as a result of the latter that the exceptions can be identified and described.
Nichols Joy S.
Parker Joel William
Walborn Nolan R.
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