Studies of the Carina nebula. III. The spectral energy distribution of the very hot and massive star HD 93250.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1980
- Bibcode:
- 1980A&A....91..360T
- Keywords:
-
- Hot Stars;
- Nebulae;
- O Stars;
- Spectral Energy Distribution;
- Stellar Spectra;
- Supermassive Stars;
- Interstellar Extinction;
- Stellar Evolution;
- Stellar Spectrophotometry;
- Thermodynamic Equilibrium;
- Ultraviolet Spectra;
- Astrophysics