J/ApJ/656/431 LS I +65 010 radial velocities and Halpha EW (Grundstrom+, 2007)
Joint Hα and X-ray observations of massive X-ray binaries.
I. The B supergiant system LS I +65 010 = 2S 0114+650.
Grundstrom E.D., Blair J.L., Gies D.R., Huang W., McSwain M.V.,
Raghavan D., Riddle R.L., Subasavage J.P., Wingert D.W., Levine A.M.,
Remillard R.A.
<Astrophys. J., 656, 431-436 (2007)>
=2007ApJ...656..431G 2007ApJ...656..431G
ADC_Keywords: Binaries, spectroscopic ; Binaries, X-ray ; Radial velocities ;
Equivalent widths
Keywords: binaries: spectroscopic - pulsars: individual (2S 0114+650) -
stars: early-type - stars: individual (LS I +65 010) -
stars: winds, outflows - supergiants
Abstract:
We report on a 3yr spectroscopic monitoring program of the Halpha
emission in the massive X-ray binary LS I +65 010 = 2S 0114+650, which
consists of a B supergiant and a slowly rotating X-ray pulsar. We
present revised orbital elements that yield a period of
P=11.5983±0.0006days and confirm that the orbit has a nonzero
eccentricity e=0.18±0.05. The Halpha emission profile is formed in
the base of the wind of the B supergiant primary, and we show how this
spectral feature varies on timescales that are probably related to the
rotational period of the B supergiant. We also examine the X-ray
fluxes from the Rossi X-ray Timing Explorer All-Sky Monitor
instrument, and we show that the X-ray orbital light curve has a
maximum at periastron and a minimum at the inferior conjunction of the
B supergiant. We also show that the wind emission strength and the
high-energy X-ray flux appear to vary in tandem on timescales of
approximately 1yr.
Description:
We obtained 100 optical spectra of LS I +65 010 with the Kitt Peak
National Observatory 0.9m coude feed telescope during six observing
runs between 1998 August and 2000 December.
Objects:
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RA (2000) DE Designation(s)
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01 18 02.7 +65 17 30 LS I +65 010 = V* V662 Cas
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 42 100 Radial velocity and equivalent width measurements
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See also:
J/ApJ/656/437 : LS I +61 303 radial velocities & Halpha EW (Grundstrom+, 2007)
J/ApJ/660/1398 : HDE 245770 & X Per RV & Halpha EW (Grundstrom+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Mid-point Heliocentric Julian Date
13- 17 F5.3 --- Phase Orbital phase
19- 23 F5.1 km/s RV Radial velocity (1)
25 A1 --- f_RV [a] Flag on RV (2)
27- 31 F5.1 km/s (O-C) Observed minus calculated residual from the fit
33- 36 F4.1 km/s DelV ? Measured velocity difference of 6613Å ISM
line from its position in template spectrum
38- 42 F5.2 0.1nm EWHa Hα equivalent width in Angstroms
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Note (1): The typical stellar radial velocity errors are about ±1.7km/s
for the high dispersion spectra and about twice that value for the
lower dispersion spectra (based upon the differences of closely spaced
pairs of observations).
Note (2): Assigned zero weight in the orbital solution.
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History:
From electronic version of the journal
References:
Grundstrom et al., Paper II 2007ApJ...656..437G 2007ApJ...656..437G, Cat. J/ApJ/656/437
Grundstrom et al., Paper III 2007ApJ...660.1398G 2007ApJ...660.1398G, Cat. J/ApJ/660/1398
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 10-Dec-2008