J/A+A/461/1077 Radial velocities of DW Car (Southworth+, 2007)
Absolute dimensions of eclipsing binaries.
XXIV. The Be star system DW Carinae, a member of the open cluster Collinder 228.
Southworth J., Clausen J.V.
<Astron. Astrophys. 461, 1077 (2007)>
=2007A&A...461.1077S 2007A&A...461.1077S
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: stars: fundamental parameters - stars: binaries: eclipsing -
stars: binaries: spectroscopic - stars: emission-line, Be -
stars: distances - stars: individual: DW Carinae -
open clusters and associations: individual: Collinder 228
Abstract:
We have studied the high-mass short-period detached eclipsing binary
DW Carinae using high-resolution echelle spectroscopy and
photoelectric Stroemgren uvby light curves. We derived masses and radii
accurate to 1% as well as the effective temperatures and reddening of
the system. The high rotational velocities of the component stars
meant that blending was a major problem when deriving radial
velocities from the spectroscopy. Only helium lines provided good
results, and a critique of different methods of measurement showed
that spectral disentangling and fitting double Gaussians showed that
these were the best able to provide reliable results in this case. The
final spectroscopic orbit was calculated using spectral disentangling
but we also provided radial velocities by fitting double Gaussians to
the He-I 4472-A spectral line in each spectrum as this gives a good
idea as to the quality of the data whilst providing a result very
close to that adopted to calculate the masses. The light curves of DW
Car are published as part of an accompanying paper (Clausen et al.,
2006, Cat. J/A+A/461/1065).
Description:
Light curves of DW Car in the Stroemgren uvby photometric system were
obtained from the Stroemgren Automated Telescope at ESO La Silla. These
are presented in Clausen et al. (2007, Cat. J/A+A/461/1065) and
contain 518 observations in each passband. Clausen et al. (2007, Cat.
J/A+A/461/1065) also presents an updated orbital ephemeris and
standard Stroemgren uvby and Crawford Hβ indices for DW Car.
29 high-resolution spectra were obtained using the FEROS fibre-fed
echelle spectrograph on the ESO 1.52m telescope at La Silla
between 1998 November and 2000 January.
Objects:
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RA (2000) DE Designation(s)
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10 43 10.1 -60 02 12 DW Car = HD 305543
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 29 Radial velocities for He 4471 line
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See also:
J/A+A/461/1065 : uvby diff. photometry of 4 eclipsing binaries (Clausen+, 2007)
J/A+A/469/285 : Differential Stroemgren photometry of U Oph (Vaz+, 2007)
J/A+A/487/1095 : Radial velocities of QD Boo, VZ Hya, WZ Oph (Clausen+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
14- 17 F4.1 --- Weight Weight assigned for calculating orbits
18- 24 F7.1 km/s RV(A) Measured radial velocity of star A
25- 31 F7.1 km/s RV(B) Measured radial velocity of star B
32- 36 F5.1 km/s res(A) (O-C) residual from best-fit solution star A
37- 42 F6.1 km/s res(B) (O-C) residual from best-fit solution star B
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Acknowledgements: John Southworth, jkt(at)astro.keele.ac.uk
References:
Andersen et al. Paper I 1983A&A...121..271A 1983A&A...121..271A
Andersen et al. Paper II 1983A&A...128...17A 1983A&A...128...17A, V Pup
Andersen Paper III 1984A&A...130..102A 1984A&A...130..102A, KM Hyd
Vaz & Andersen Paper IV 1984A&A...132..219V 1984A&A...132..219V, PV Pup
Andersen et al. Paper V 1984A&A...134..147A 1984A&A...134..147A, VV Pyx
Andersen et al. Paper VI 1984A&A...137..281A 1984A&A...137..281A, DM Vir
Andersen & Gimenez Paper VII 1985A&A...145..206A 1985A&A...145..206A, V1647 Sgr
Andersen et al. Paper VIII 1985A&A...151..329A 1985A&A...151..329A, V760 Sco
Popper et al. Paper IX 1985AJ.....90.1324P 1985AJ.....90.1324P, GZ CMa
Andersen et al. Paper X 1987A&A...174..107A 1987A&A...174..107A, V1143 Cyg
Clausen et al. Paper XI 1986A&A...167..287C 1986A&A...167..287C, V451 Oph
Andersen et al. Paper XII 1987A&A...175...60A 1987A&A...175...60A, TZ Men
Andersen et al. Paper XIII 1988A&A...196..128A 1988A&A...196..128A, AI Phe
Andersen et al. Paper XIV 1989A&A...211..346A 1989A&A...211..346A, UX Men
Andersen & Clausen Paper XV 1989A&A...213..183A 1989A&A...213..183A, EM Car
Andersen et al. Paper XVI 1990A&A...228..365A 1990A&A...228..365A, V1031 Ori
Clausen & Gimenez Paper XVIII 1991A&A...241...98C 1991A&A...241...98C, CW Cep
Andersen et al. Paper XVII 1991A&A...246...99A 1991A&A...246...99A, TZ For
Clausen Paper XIX 1991A&A...246..397C 1991A&A...246..397C, BW Aqr
Andersen et al. Paper XX 1993A&A...277..439A 1993A&A...277..439A, GG Lup
Alencar et al. Paper XXI 1997A&A...326..709A 1997A&A...326..709A, V906 Sco
Torres et al. Paper XXII 1997AJ....114.2764T 1997AJ....114.2764T, HS Hya
Torres et al. Paper XXIII 2000AJ....119.1942T 2000AJ....119.1942T, EI Cep
Vaz et al., Paper XXV 2007A&A...469..285V 2007A&A...469..285V, Cat. J/A+A/469/285
Clausen et al. Paper XXVI 2008A&A...487.1095C 2008A&A...487.1095C, Cat. J/A+A/487/1095
(End) John Southworth [Univ. of Warwick, UK], Patricia Vannier [CDS] 23-Oct-2006