Studies of the Carina Nebula. III - The spectral energy distribution of the very hot and massive star HD 93250

Details Studies of the Carina Nebula. III - The spectral energy distribution of the very hot and massive star HD 93250 Studies of the Carina Nebula. III - The spectral energy distribution of the very hot and massive star HD 93250

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..360t&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 360-364.

Astronomy and Astrophysics

Astrophysics

7

Hot Stars, Nebulae, O Stars, Spectral Energy Distribution, Stellar Spectra, Supermassive Stars, Interstellar Extinction, Stellar Evolution, Stellar Spectrophotometry, Thermodynamic Equilibrium, Ultraviolet Spectra

Scientific paper

Photometric observations in the spectral region between 0.33-5 m are used to determine the spectral energy distribution of the very massive O 3-type star HD 93250 (located in the Carina Nebula) corrected for anomalous extinction, which is characterized by a ratio of total to selective extinction R = 3.9±0.1 (Thé et al., 1980). From the agreement of the observed extinction-free and the calculated theoretical energy distribution of HD 93250 it is concluded that the photosphere of the star is well described by a plane-parallel, hydrostatic non-LTE model. This confirms the result of a non-LTE analysis of the stellar line spectrum, which has been carried out recently by Kudritzki (1980). A study of ANS ultraviolet observations of HD 93250 shows that the UV part of the extinction law is probably also anomalous.

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