NDLI: Tomographic separation of composite spectra. the components of plaskett's star

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Tomographic separation of composite spectra. the components of plaskett's star

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gies, Douglas R. Wiggs, Michael S. Bagnuolo Jr., William G.
Copyright Year	1991
Description	The UV photospheric lines of Plaskett's Star (HD 47129), a 14.4 day period, double lined O-type spectroscopic binary were analyzed. Archival data from IUE (17 spectra well distributed in orbital phase) were analyzed with several techniques. A cross correlation analysis, which showed that the secondary produces significant lines in the UV, indicates that the mass ratio is q = 1.18 + or - 0.12 (secondary slightly more massive). A tomography algorithm was used to produce the separate spectra of the two stars in six spectral regions. The interpolated spectral classifications of the primary and secondary, 07.3 I and 06.2 I, respectively, were estimated through a comparison of UV line ratios with those in spectral standard stars. The intensity ratio of the stars in the UV is 0.53 + or - 0.05 (primary brighter). The secondary lines appear rotationally broadened, and the projected rotational velocity V sin i for this star is estimated to be 310 + or - 20 km/s. The possible evolutionary history of this system is discussed through a comparison of the positions of the components and evolutionary tracks in the H-R diagram.
File Size	1361996
Page Count	36
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910018736
Archival Resource Key	ark:/13960/t7rn82p0x
Language	English
Publisher Date	1991-01-01
Access Restriction	Open
Subject Keyword	Astronomy Stellar Spectra Stellar Winds O Stars Angular Resolution Hertzsprung-russell Diagram Ultraviolet Spectra Stellar Evolution Mass Ratios Photosphere Algorithms Stellar Mass Binary Stars Spectrum Analysis Computer Aided Tomography Line Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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