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J/MNRAS/448/1137 Radial velocity curve of the HD170582 donor (Mennickent+, 2015)

Fundamental parameters of the close interacting binary HD 170582 and its luminous accretion disc. Mennickent R.E., Djurasevic G., Cabezas M., Cseki A., Rosales J.G., Niemczura E., Araya I., Cure M. <Mon. Not. R. Astron. Soc., 448, 1137-1152 (2015)> =2015MNRAS.448.1137M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Radial velocities Keywords: binaries: general - stars: early-type - stars: emission-line, Be - stars: evolution - stars: mass-loss Abstract: We present a spectroscopic and photometric study of the double period variable HD 170582. Based on the study of the ASAS V-band light curve, we determine an improved orbital period of 16.87177±0.02084 d and a long period of 587 d. We disentangled the light curve into an orbital part, determining ephemerides and revealing orbital ellipsoidal variability with unequal maxima, and a long cycle, showing quasi-sinusoidal changes with amplitude ΔV=0.1mag. Assuming synchronous rotation for the cool stellar component and semidetached configuration we find a cool evolved star of M2=1.9±0.1 M, T2=8000±100 K and R2=15.6±0.2 R, and an early B-type dwarf of M1=9.0±0.2 M. The B-type star is surrounded by a geometrically and optically thick accretion disc of radial extension 20.8±0.3 R contributing about 35 percent to the system luminosity at the V band. Two extended regions located at opposite sides of the disc rim, and hotter than the disc by 67 and 46 percent, fit the light-curve asymmetries. The system is seen under inclination 67.4°±0.4° and it is found at a distance of 238±10 pc. Specially interesting is the double line nature of HeI 5875; two absorption components move in antiphase during the orbital cycle; they can be associated with the shock regions revealed by the photometry. The radial velocity of one of the HeI 5875 components closely follows the donor radial velocity, suggesting that the line is formed in a wind emerging near the stream-disc interacting region. Description: We conducted spectroscopic observations of HD 170582 since year 2008-2013 obtaining 13 optical spectra with resolution R∼40000 with the spectrograph CORALIE (La Silla ESO Observatory), 112 spectra with CHIRON spectrograph with R∼30000 (fibre mode, Cerro Tololo Inter-American Observatory, CTIO) and 11 spectra with the DuPont-echelle spectrograph with R∼40000 (Las Campanas Observatory, LCO). RVs for the donor were measured by cross-correlating the observed spectra with a reference spectrum and then applying the velocity shift corresponding to the template velocity. This last was obtained by fitting simple Gaussians to some metallic lines, finding the central wavelength and comparing these wavelengths with the corresponding laboratory wavelengths. Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 18 30 47.53 -14 47 27.8 HD 170582 = TYC 5703-2382-1 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 29 111 RVs of the donor and their errors
See also: V/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999) B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 F14.6 d HJD Heliocentric Julian Date 16- 23 F8.3 km/s RV Radial velocity 25- 29 F5.3 km/s e_RV Uncertainty in RV
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 21-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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