J/AJ/148/114 Radial velocity curve of δ Cir (Mayer+, 2014)
The three-body system δ Circini.
Mayer P., Harmanec P., Sana H., Le Bouquin J.-B.
<Astron. J., 148, 114 (2014)>
=2014AJ....148..114M 2014AJ....148..114M
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ;
Stars, early-type ; Radial velocities
Keywords: binaries: general - stars: early-type -
stars: individual: Delta Cir
Abstract:
Delta Cir is known as an O7.5 III eclipsing and spectroscopic binary
with an eccentric orbit. Penny et al. discovered the presence of a
third component in the IUE spectra. The eclipsing binary and the third
body revolve around a common center of gravity with a period of
1644days in an eccentric orbit with a semimajor axis of 10AU. We
demonstrate the presence of apsidal-line rotation with a period of
~141yr, which is considerably longer than its theoretically
predicted value, based on the published radii of the binary components
derived from the Hipparchos Hp light curve. However, our new
solution of the same light curve resulted in smaller radii and better
agreement between the observed and predicted period of the
apsidal-line advance. There are indications that the third body is a
binary. The object was resolved by VLTI using the PIONIER combiner; in
2012 June, the separation was 3.78mas with magnitude difference in the
H region 1.75fm. This result means that (assuming a distance of 770pc)
the inclination of the long orbit is 87.7°.
Description:
The spectra in the ESO archive consist of two UVES spectra from
2000-2001, 29 FEROS spectra from 2007 to 2009, and 95 HARPS spectra
from 2009 to 2012. UVES, FEROS, and HARPS are echelle spectrographs.
UVES is used with VLT at Paranal, and FEROS is used with the 2.2m
ESO/MPI telescope at the ESO La Silla Observatory and provides spectra
in the region from 3625 to 9125Å with a resolving power of 48000.
HARPS is a spectrograph connected to the 3.6m ESO telescope, also at
La Silla. Its spectral range is from 3781 to 6911Å and the
resolving power is 115000.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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15 16 56.90 -60 57 26.1 * del Cir = HD 135240 (P=3.902463)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 32 120 FEROS and HARPS radial velocities of δ Cir
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See also:
J/A+A/481/183 : Radial velocity curves of V1007 Sco (Mayer+, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 --- RJD Reduced Julian Date (HJD-2400000)
12- 16 F5.3 --- Phase Orbital phase (1)
18- 23 F6.1 km/s RV1 Primary radial velocity
25- 28 I4 km/s RV2 ? Secondary radial velocity
30- 32 I3 km/s RV3 ? Tertiary radial velocity
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Note (1): Calculated for the final ephemeris of Table3 of the 3.9days orbit:
HJD2454285.66+3.902463*E.
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 10-Dec-2014