TY - JOUR
T1 - Study of spectroscopic binaries with TODCOR. III. Application to triple-lined systems
AU - Zucker, Shay
AU - Torres, Guillermo
AU - Mazeh, Tsevi
PY - 1995/10/20
Y1 - 1995/10/20
N2 - In a previous paper we introduced TODCOR, a new two-dimensional correlation technique, to analyze spectra of binary stars and derive the Doppler shifts of the two components. We propose here a generalization of TODCOR to analyze spectra of triple-lined stellar systems and derive the Doppler shifts of the three components. The algorithm computes the correlation of the observed spectrum against combinations of three template spectra, with all possible shifts. Thus, the correlation is a three-dimensional function in velocity space. The location of the maximum of this function corresponds to the actual shifts of the three components. We demonstrate the difficulties of the one-dimensional cross-correlation and the advantages of the new algorithm with a simulated example. We also analyze with the algorithm a real test case, HD 100018, and we show that the velocities derived with the new extension of TODCOR solve a long-standing discrepancy between the old orbital elements and the mass estimate for the system.
AB - In a previous paper we introduced TODCOR, a new two-dimensional correlation technique, to analyze spectra of binary stars and derive the Doppler shifts of the two components. We propose here a generalization of TODCOR to analyze spectra of triple-lined stellar systems and derive the Doppler shifts of the three components. The algorithm computes the correlation of the observed spectrum against combinations of three template spectra, with all possible shifts. Thus, the correlation is a three-dimensional function in velocity space. The location of the maximum of this function corresponds to the actual shifts of the three components. We demonstrate the difficulties of the one-dimensional cross-correlation and the advantages of the new algorithm with a simulated example. We also analyze with the algorithm a real test case, HD 100018, and we show that the velocities derived with the new extension of TODCOR solve a long-standing discrepancy between the old orbital elements and the mass estimate for the system.
KW - Binaries: spectroscopic
KW - Stars: individual (HD 100018)
KW - Techniques: spectroscopic
UR - http://www.scopus.com/inward/record.url?scp=0040314153&partnerID=8YFLogxK
U2 - 10.1086/176354
DO - 10.1086/176354
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AN - SCOPUS:0040314153
SN - 0004-637X
VL - 452
SP - 863
EP - 869
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -