Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..340f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 2, Oct. 1985, p. 340-348.
Astronomy and Astrophysics
Astrophysics
96
A Stars, Angular Velocity, B Stars, Forbidden Bands, Herbig-Haro Objects, Stellar Rotation, Line Spectra, Pre-Main Sequence Stars, Spectrum Analysis, Stellar Spectrophotometry
Scientific paper
All available spectroscopic material on Herbig Ae/Be stars is reexamined in order to determine the photospheric spectral types of these stars as accurately as possible by analyzing line widths and line ratios. The resulting revised spectral types are believed to be the most accurate available today. Based on this spectral classification, the projected rotational velocity of as many objects as possible is determined. The technique applied here involves the convolution of a nonrotating standard star profile with a rotational function and a subsequent comparison with the program star profile until a satisfactory match is achieved. The observed distribution of rotational velocity supports the argument that Herbig Ae/Be stars are young objects of intermediate mass which have not yet reached the main sequence. The profiles of the forbidden lines present in a number of objects indicate macroscopic motion of less than 50 km/s in a tenuous outer envelope.
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