J/A+A/563/A138 Spectroscopy of spectroscopic binaries (Veramendi+, 2014)
Spectroscopic study of early-type multiple stellar systems.
I. Orbits of spectroscopic binary subsystems.
Veramendi M.E., Gonzalez J.F.
<Astron. Astrophys. 563, A138 (2014)>
=2014A&A...563A.138V 2014A&A...563A.138V
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Spectroscopy
Keywords: techniques: radial velocities - binaries: spectroscopic -
stars: early-type - binaries: eclipsing - stars: chemically peculiar
Abstract:
The present knowledge of stellar properties and dynamical structure of
early-type multiple stellar systems is insufficient to offer useful
statistical constraints for stellar formation models.
To increase the amount of observational information about the
characteristics of early-type multiples, we carried out a
spectroscopic monitoring to search for new spectroscopic components
and to determine their orbits.
We observed 30 early-type multiple systems using the 2.15m telescope
and REOSC echelle spectrograph at the Complejo Astronomico El
Leoncito (CASLEO) during 10 observing runs between 2008 and 2013. We
measured radial velocities by cross-correlations and applied a
spectral disentangling method to double-lined systems. We calculated
orbital elements for the inner subsystem of each analysed multiple.
In this first paper we present calculated orbits for six previously
catalogued subsystems. Three subsystems had no previously published
parameters, while we obtained more accurate orbits for the other
three. In one case we found absolute masses and radii for the
components by using available photometric data.
The long-term spectroscopic monitoring of multiple systems is a useful
method of investigating the companions in intermediate hierarchical
levels, particularly those that could affect the dynamical evolution
of a close inner binary subsystem.
Description:
We present spectra of three single-lined spectroscopic binaries, three
double-lined spectroscopic binaries and three objects with constant
radial velocity, which are members of six early-type multiple stellar
systems. The observations were carried out using the 2.15 telescope
and REOSC echelle spectrograph at the Complejo Astronomico El Leoncito
(CASLEO). The spectra cover the wavelength range 370nm-630nm with a
resolution R=13300 and a typical signal-to-noise ratio of
approximately 100.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 78 9 Components of multiple systems observed and
analysed in this paper
list.dat 86 139 List of individual spectra
sp/* 139 Individual FITS spectra
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See also:
J/A+AS/124/75 : Multiple Star Catalogue (MSC, Tokovinin 1997-1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS name of system (B/wds)
12- 16 A5 --- Comp Component designation
18- 23 I6 --- HD HD number of system
25- 31 A7 --- SpT.l Literature MK spectral type
33- 41 A9 --- SpType This paper MK spectral type
43- 78 A36 --- Rem Results
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lam.min [3599/4031] Lower value of wavelength interval
8 A1 --- --- [/]
9- 15 F7.2 0.1nm lam.max [5900/6481] Upper value of wavelength interval
17- 24 F8.6 0.1nm dlam [0.13/0.16] Wavelength resolution
27- 31 I5 --- Nx [14952/18303] Number of pixels along X-axis
33- 34 I2 Kibyte size [65/79] Size of FITS file
36- 48 A13 --- FileName Name of FITS file in subdirectory sp
51- 60 A10 "date" Obs.Date Observaiton date
62- 86 A25 --- Title Title of the file
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Acknowledgements:
Maria Eugenia Veramendi, mveramendi(at)icate-conicet.gob.ar
(End) Maria Veramendi [ICATE, Argentina], Patricia Vannier [CDS] 21-Mar-2014