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 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:
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RA (ICRS) DE Designation(s)
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18 30 47.53 -14 47 27.8 HD 170582 = TYC 5703-2382-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 29 111 RVs of the donor and their errors
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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
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 21-Nov-2017