J/A+A/441/685 HeI & HeII radial velocities of Sk 160/SMC X-1 (Val Baker+, 2005)
The mass of the neutron star in SMC X-1.
Val Baker A., Norton A.J., Quaintrell H.
<Astron. Astrophys. 441, 685 (2005)>
=2005A&A...441..685V 2005A&A...441..685V
ADC_Keywords: Binaries, X-ray ; Stars, supergiant ; Radial velocities ;
Spectroscopy
Keywords: binaries: close - stars: neutron - stars: individual: SMC X-1 -
stars: individual: Sk 160 - stars: fundamental parameters
Abstract:
We present new optical spectroscopy of the eclipsing binary pulsar Sk
160/SMC X-1. From the He I absorption lines, taking heating
corrections into account, we determine the radial velocity
semi-amplitude of Sk 160 to be 21/8±1.8km/s. Assuming Sk 160 fills
its Roche-lobe, the inclination angle of the system is
i=65.3±1.3° and in this case we obtain upper limits for the mass
of the neutron star as Mx=1.21±0.10M☉ and for Sk 160 as
Mo=16.6±0.4M_☉.
Description:
This Table lists the raw and heating corrected HeI absorption line
heliocentric radial velocity data for Sk 160 resulting from
August/September 2000 observations at SAAO. Also listed are the
heliocentric radial velocities measured from the HeII 4686Å
emission line.
Objects:
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RA (2000) DE Designation(s)
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01 17 05.1 -73 26 36 Sk 160 = X SMC X-1
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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 56 HeI absorption line & HeII emission line
heliocentric radial velocity data for Sk 160
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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- 9 F9.3 d MJD Modified Julian Date (JD-2400000.5)
of each observation
11- 15 F5.3 --- Phase [0/1] Orbital phase of each observation (ecl=0)
17- 19 I3 km/s HRVHeI Heliocentric HeI absorption line raw RVs
21- 22 I2 km/s e_HRVHeI rms uncertainty in each RV
24- 26 I3 km/s HRVHeIc Heating corrected heliocentric HeI RVs
28- 31 I4 km/s HRVHeII ? Heliocentric HeII emission line RVs
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Acknowledgements: A.J. Norton, a.j.norton(at)open.ac.uk
(End) Patricia Vannier [CDS] 13-Jul-2005