On the Spectrum of the Herbig Be-Star HD200775

Details On the Spectrum of the Herbig Be-Star HD200775 On the Spectrum of the Herbig Be-Star HD200775

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105..300b&link_type=abstract

Astronomy and Astrophysics, Vol.105, P. 300, 1982

Astronomy and Astrophysics

Astrophysics

30

Scientific paper

On the basis of high-dispersion spectra and other observational material, HD 200775 is reanalyzed using ι Her as a comparison star. By comparing the depths in the wings of Hγ and Hδ and the equivalent widths of He I lines with predictions from model atmospheres we find Teff =17000±1000 K (in the scale of Kurucz' 1979 models) and log g [cm-2] = 3.6±0.3 corresponding to a spectral type of B 3 V. This is consistent with the continuum energy distribution if one allows for some circumstellar emission The interstellar absorption features at 4430 and 2200 Å are of unusual weakness. The strength of the Hα emission requires a substantial rate of photoionization from the first excited level (n =2) of hydrogen which probably arises from a compact envelope. This is in accord with the finding that the radio emission at λ2 cm is less than 3 mJy.

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