Information on resource 'High-resolution optical spectra of HD165052 (Ferrero+, 2013) at NOVA'
This is a set of high-resolution high-S/N optical spectra of the
massive binary star HD 165 052 (O7Vz + O7.5Vz) taken between 2008
April and 2011 May with echelle spectrographs at CASLEO (mainly), LCO
and ESO. Each one covers the spectral range 3700-6000 A with a
resolution varying between ~13000 and ~45000 @ 5000A according to the
instrument. Originally, the spectra were secured for radial velocity
measurements. More details about observations, instrument
configurations and reduction process can be found in documentation
section.
We present a new set of radial velocity measurements of the spectroscopic binary HD 165052 obtained by disentangling high-resolution optical spectra.
The longitude of the periastron (ϖ = 60 ± 2°) shows a variation with respect to previous studies.
We have determined the apsidal motion rate of the system, ϖ =12.1 ± 0.3° yr-1,
which was used to calculate the absolute masses of the binary components: M1 = 22.5 ± 1.0 M⊙ and M2 = 20.5 ± 0.9 M⊙.
Analysing the separated spectra, we have reclassified the components as O7Vz and O7.5Vz stars.
Reference:
Apsidal motion in massive close binary systems - I. HD 165052, an extreme case?
Authors: Ferrero, G.; Gamen, R.; Benvenuto, O.; Fernandez-Lajus, E.
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