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Spectral photometry of extreme helium stars: Ultraviolet fluxes and effective temperatureUltraviolet flux distributions are presented for the extremely helium rich stars BD +10 deg 2179, HD 124448, LSS 3378, BD -9 deg 4395, LSE 78, HD 160641, LSIV -1 deg 2, BD 1 deg 3438, HD 168476, MV Sgr, LS IV-14 deg 109 (CD -35 deg 11760), LSII +33 deg 5 and BD +1 deg 4381 (LSIV +2 deg 13) obtained with the International Ultraviolet Explorer (IUE). Broad band photometry and a newly computed grid of line blanketed model atmospheres were used to determine accurate angular diameters and total stellar fluxes. The resultant effective temperatures are in most cases in satisfactory agreement with those based on broad band photometry and/or high resolution spectroscopy in the visible. For two objects, LSII +33 deg 5 and LSE 78, disagreement was found between the IUE observations and broadband photometry: the colors predict temperatures around 20,000 K, whereas the UV spectra indicate much lower photospheric temperatures of 14,000 to 15,000 K. The new temperature scale for extreme helium stars extends to lower effective temperatures than that of Heber and Schoenberner (1981) and covers the range from 8,500 K to 32,000 K.
Document ID
19830016162
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Drilling, J. S. (Louisiana State Univ. Baton Rouge, LA, United States)
Schoenberner, D. (Louisiana State Univ. Baton Rouge, LA, United States)
Heber, U. (Kiel Univ. London, United States)
Lynas-Gray, A. E. (University College)
Date Acquired
September 4, 2013
Publication Date
January 1, 1982
Subject Category
Astronomy
Report/Patent Number
NAS 1.26:170261
NASA-CR-170261
Accession Number
83N24433
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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