J/AJ/120/2101 Radial Velocity and Photometry of HD 104994 (Marchenko+, 2000)
The puzzle of HD 104994 (WR 46).
Marchenko S.V., Arias J., Barba R., Balona L., Moffat A.F.J., Niemela V.S.,
Shara M.M., Sterken C.
<Astron. J., 120, 2101-2113 (2000)>
=2000AJ....120.2101M 2000AJ....120.2101M
ADC_Keywords: Stars, Wolf-Rayet ; Photometry ; Spectroscopy ; Radial velocities
Keywords: Stars: Individual: Alphanumeric: WR 46, Stars: Variables: General,
Stars: Wolf-Rayet
Abstract:
Intense coordinated spectroscopic and photometric monitoring of the
suspected Wolf-Rayet binary WR 46 in 1999 reveals clear periodic
variations, P=0.329±0.013 days, in the radial velocities of the
emission lines of highest ionization potential, O VI and N V, found
deepest in the Wolf-Rayet wind and thus least likely to be perturbed
by a companion. These are accompanied by coherent variability in the
profiles of lines with lower ionization/excitation potential and in
the continuum flux. Most probably originating from orbital motion of
the Wolf-Rayet component of the binary, this periodic radial velocity
signal disappears from time to time, thus creating a puzzle yet to be
solved. We show that the entangled patterns of the line profile
variability are mainly governed by transitions between high and low
states of the system's continuum flux. Based in part on observations
obtained at the European Southern Observatory, La Silla, Chile (ESO
program 62.H-0110).
Objects:
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RA (2000) DE Designation(s)
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12 05 18.72 -62 03 10.1 HD104994 = WR 46
12 05 13.73 -62 01 57.9 GSC 8978-443
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 134 Radial velocity measurements
table2.dat 52 30 UBVRI Photometry of WR 46
table3.dat 58 133 by Photometry of WR 46
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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 JD Julian date of observation
15- 18 I4 km/s RV1 Radial velocity of the He II + N V
4603-4686 Å complex
21- 22 I2 km/s e_RV1 Uncertainty in RV1
25- 28 I4 km/s RV2 Radial velocity of the deblended
O VI 3811,3834 Å doublet
31- 34 I4 km/s RV3 Radial velocity of the N V 4943,4945 Å blend
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Julian date of observation
15- 20 F6.3 mag Vmag The V band magnitude
23- 28 F6.3 mag B-V The B-V color
31- 36 F6.3 mag U-B The U-B color
39- 44 F6.3 mag V-R The V-R color
48- 52 F5.3 mag V-I The V-I color
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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 JD(b) ? Julian date of the b band observation
15- 20 F6.3 mag b(WR-c1) ? Differential Stromgren b photometry:
WR 46 - GSC 8978-443
23- 28 F6.3 mag b(c1-c2) ? Differential Stromgren b photometry:
GSC 8978-443 - c2 (1)
31- 42 F12.4 d JD(y) ? Julian date of the y band observation
45- 50 F6.3 mag y(WR-c1) ? Differential Stromgren y photometry:
WR 46 - GSC 8978-443
53- 58 F6.3 mag y(c1-c2) ? Differential Stromgren b photometry:
GSC 8978-443 - c2 (1)
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Note (1): Star c2 is located 7" N and 26" E of GSC 8978-443.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Laurent Cambresy [CDS] 12-May-2004