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Title:
Ultraviolet, optical, and infrared observations of the Herbig Be star HD 200775
Authors:
Altamore, A.; Baratta, G. B.; Cassatella, A.; Grasdalen, G. L.; Persi, P.; Viotti, R.
Affiliation:
AA(Osservatorio Astronomico, Rome, Italy), AB(Roma, Osservatorio Astronomico, Rome, Italy), AC(ESA, Astronomy Div., Madrid, Spain), AD(Wyoming, University, Laramie, Wyo.), AE(CNR, Laboratorio di Astrofisica Spaziale, Frascati, Italy), AF(CNR, Laboratorio di Astrofisica Spaziale, Frascati, Italy)
Publication:
Astronomy and Astrophysics, vol. 90, no. 3, Oct. 1980, p. 290-296. (A&A Homepage)
Publication Date:
10/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
B STARS, INFRARED STARS, STELLAR ATMOSPHERES, STELLAR SPECTRA, ULTRAVIOLET ASTRONOMY, IUE, OPTICAL EQUIPMENT, SPECTRAL ENERGY DISTRIBUTION, STELLAR ENVELOPES, ULTRAVIOLET SPECTRA
Comment:
A&AA ID. AAA028.114.082
Bibliographic Code:
1980A&A....90..290A

Abstract

The Herbig Be star HD 200775, associated with the extended reflection nebulae NGC 7023, has been observed in the ultraviolet with the IUE satellite, in the optical with the 90-cm Schmidt telescope of Campo Imperatore Observatory, and in the infrared with the 2.3 m telescope of Wyoming University in a coordinated campaign made during August 1978. The ultraviolet low-dispersion spectrum shows several strong absorption resonance lines (C II, C IV, Si II, Si IV, Al III . . .) probably formed in an expanding envelope. From the IR observations up to 12.6 microns, a value of the mass loss rate expansion velocity ratio of 2.3 x 10 to the -9th solar masses/year per km/sec is derived. The infrared energy distribution shows also the presence of a dust shell at a mean distance of about 3 x 10 to the 14th cm from the central star. A value of the color excess of 0.25 + or - 0.05 is derived from the 2200-A interstellar band and from the gradient of the UV continuum.

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