J/MNRAS/356/545 Radial velocities of DG Leo (Fremat+, 2005)
Spectral disentangling of the triple system DG Leo:
orbits and chemical composition.
Fremat Y., Lampens P., Hensberge H.
<Mon. Not. R. Astron. Soc., 356, 545-556 (2005)>
=2005MNRAS.356..545F 2005MNRAS.356..545F
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: stars: abundances - binaries: spectroscopic -
stars: fundamental parameters - stars: individual: DG Leo - delta Scut
Abstract:
DG Leo is a spectroscopic triple system composed of three stars of
late-A spectral type, one of which was suggested to be a delta Scuti
star. Seven nights of observations at high spectral and high
time-resolution at the Observatoire de Haute-Provence with the ELODIE
spectrograph were used to obtain the component spectra by applying a
Fourier transform spectral disentangling technique. Comparing these
with synthetic spectra, the stellar fundamental parameters (effective
temperature, surface gravity, projected rotation velocity and chemical
composition) are derived. The inner binary consists of two Am
components, at least one of which is not yet rotating synchronously at
the orbital period though the orbit is a circular one. The distant
third component is confirmed to be a delta Scuti star with normal
chemical composition.
Description:
The triple system is spectroscopically unresolved, but the Doppler
information available in the composite spectrum can be used to recover
the contributions of the individual components. Therefore, extensive
spectroscopy was obtained at the Haute-Provence Observatory (OHP) with
the ELODIE spectrograph on the 1.93-m telescope. Observations were
collected during seven nights in 2003 (January 3-7 and January 11-15)
and cover about 50 per cent of the close binary's (component A)
orbital phase. The time exposure was fixed at 360s in order to
resolve the presumed p-mode pulsations, yet with a good
signal-to-noise ratio and a high resolution (about 50000).
Objects:
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RA (2000) DE Designation(s)
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09 49 50.1 +21 10 46 DG Leo = HD 85040
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 155 Radial velocities measured on the
cross-correlation functions
table3.dat 59 244 Radial velocities derived with KOREL
table4a.dat 45 44 Micrometric (theta, rho) measurements
table4b.dat 37 39 Speckle (x, y) measurements
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See also:
J/A+A/438/201 : DG Leo uvby differential photometry (Lampens+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date of observation
15- 20 F6.2 km/s RVB ? Radial velocity of component B
23- 27 F5.2 km/s e_RVB ? rms uncertainty on RVB
31- 36 F6.2 km/s RVAb ? Radial velocity of component Ab
40- 43 F4.2 km/s e_RVAb ? rms uncertainty on RVAb
47- 52 F6.2 km/s RVAa ? Radial velocity of component Aa
56- 59 F4.2 km/s e_RVAa ? rms uncertainty on RVAa
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date of observation
15- 20 F6.2 km/s RVB ? Radial velocity of component B
23- 27 F5.2 km/s RVB(O-C) ? Deviation relatively to the orbital solution
31- 36 F6.2 km/s RVAb ? Radial velocity of component Ab
39- 43 F5.2 km/s RVAb(O-C) ? Deviation relatively to the orbital solution
47- 52 F6.2 km/s RVAa ? Radial velocity of component Aa
55- 59 F5.2 km/s RVAa(O-C) ? Deviation relatively to the orbital solution
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Byte-by-byte Description of file: table4a.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 yr Epoch Epoch of observation
12- 18 F7.3 deg theta Position angle
22- 28 F7.3 deg theta(O-C) Deviation relatively to the orbital solution
32- 36 F5.3 arcsec rho Separation angle
40- 45 F6.3 arcsec rho(O-C) Deviation relatively to the orbital solution
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Byte-by-byte Description of file: table4b.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 yr Epoch Epoch of observation
12- 16 F5.3 arcsec xpos X position
19- 23 F5.3 arcsec xpos(O-C) Deviation relatively to the orbital solution
26- 30 F5.3 arcsec ypos Y position
33- 37 F5.3 arcsec ypos(O-C) Deviation relatively to the orbital solution
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Oct-2006