J/ApJ/662/602 Radial velocities of HD 110555 (Torres+, 2007)
Cross-correlation in four dimensions: application to the quadruple-lined
spectroscopic system HD 110555.
Torres G., Latham D.W., Stefanik R.P.
<Astrophys. J., 662, 602-612 (2007)>
=2007ApJ...662..602T 2007ApJ...662..602T
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: binaries: general - binaries: spectroscopic - binaries: visual -
methods: data analysis - stars: individual (HD 110555) -
techniques: spectroscopic
Abstract:
We develop a technique to measure radial velocities of stars from
spectra that present four sets of lines. The algorithm is an extension
of the two-dimensional cross-correlation method TODCOR to four
dimensions. It computes the correlation of the observed spectrum
against a combination of four templates with all possible shifts, and
it also allows for the derivation of the light ratios of the
components. After testing the algorithm and demonstrating its ability
to measure Doppler shifts accurately even under conditions of heavy
line blending, we apply it to the case of the quadruple-lined system
HD 110555. The primary and secondary components of this previously
known visual binary (ρ∼0.4") are each shown to be double-lined
spectroscopic binaries with periods of 57 days and 76 days,
respectively, making the system a hierarchical quadruple. The
secondary in the 76 days subsystem contributes only 2.5% to the total
light, illustrating the ability of the method to measure velocities of
very faint components.
Objects:
------------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------------
12 42 55.4 +05 15 59 HD 110555 = ADS 8639 AB
------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 57 48 *Radial velocity measurements for the visual
primary (A = Aa + Ab) of HD 110555
table5.dat 57 48 *Radial velocity measurements for the visual
secondary (B = Ba + Bb) of HD 110555
--------------------------------------------------------------------------------
Note on table4.dat, table5.dat: velocities in the heliocentric frame
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.2 km/s HRVAa The Aa heliocentric radial velocity measurement
21- 24 F4.2 km/s e_HRVAa The 1σ error in HRVAa
26- 30 F5.2 km/s (O-C)Aa The Aa velocity residual
32- 37 F6.2 km/s HRVAb The Ab heliocentric radial velocity measurement
39- 43 F5.2 km/s e_HRVAb The 1σ error in HRVAb
45- 50 F6.2 km/s (O-C)Ab The Ab velocity residual
52- 57 F6.4 --- PhasA [0,1] Orbital phase
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.2 km/s HRVBa The Ba heliocentric radial velocity measurement
21- 24 F4.2 km/s e_HRVBa The 1σ error in HRVBa
26- 30 F5.2 km/s (O-C)Ba The Ba velocity residual
32- 37 F6.2 km/s HRVBb The Bb heliocentric radial velocity measurement
39- 43 F5.2 km/s e_HRVBb The 1σ error in HRVBb
45- 50 F6.2 km/s (O-C)Bb The Bb velocity residual
52- 57 F6.4 --- PhasB Orbital phase
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 20-May-2009