Separating the spectra of binary stars. I. A simple method: Secondary reconstruction.
FERLUGA S., FLOREANO L., BRAVAR U. and BEDALO C.
Abstract (from CDS):
We present a practical method for the analysis of spectroscopic binaries, reconstructing the lines of the two components of the system. We show that the problem of the separation of binary spectra can be solved in an easy way, under most common conditions. One pair of observations may be sufficient, if taken at different orbital phases of the system, preferably at opposite quadratures. The separation procedure is discussed analytically, and a technique is described, which allows to restore the secondary lines in few steps. An algorithm is also provided, which derives the radial velocity of the secondary star, by directly analysing a difference line-profile obtained from the two input spectra. The efficiency of the method is tested, by reconstructing artificial line-profiles and simulated binary spectra as well. Then the procedure is applied to the eclipsing binary IZ Per, revealing for the first time its faint secondary spectrum.
Abstract Copyright:
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Journal keyword(s):
methods: data analysis - binaries: spectroscopic - stars: individual: IZ Per
(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
(redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
[error] : error of the corresponding value displayed before
(wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or '∼'(unknown)
quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
References (80 between 1850 and 2024) (Total 80)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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