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Title:
Systematic variations in the spectrum of Theta-1 Orionis C
Authors:
Walborn, N. R.
Affiliation:
AA(Observatorio Interamericano de Cerro Tololo, La Serena, Chile)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 1, 1981, p. L37-L39. (ApJL Homepage)
Publication Date:
01/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Early Stars, O Stars, Orion Nebula, Stellar Spectra, Variable Stars, Periodic Variations, Stellar Luminosity, X Ray Sources
DOI:
10.1086/183438
Bibliographic Code:
1981ApJ...243L..37W

Abstract

The spectrum of Theta-1 Ori C (Orion Trapezium) has been observed to change progressively from type O6 to O4 during 7 consecutive nights. This observation supports the reality of an even greater range of variation shown by scattered spectrograms obtained over a longer time span. Concurrently, variations are seen in the profile of He II 4686 A, both similar and in addition to the kinds described by Conti. Some possible implications of these variations with regard to effects on the surrounding nebulosity, and to a connection with the Trapezium X-ray source, are briefly pointed out, and several further observations are suggested.

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