Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..918a&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Dec. 1984, p. 918-924) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Nov.-Dec
Astronomy and Astrophysics
Astronomy
1
B Stars, Stellar Orbits, Variable Stars, X Ray Binaries, Absorption Spectra, Eccentric Orbits, Emission Spectra, Orbit Calculation, Radial Velocity, Stellar Mass
Scientific paper
Spectroscopic observations of HDE 245770, the optical counterpart of the X-ray source A0535 + 26, obtained at 350-700 nm with dispersion 9, 14, or 28 A/mm using a 600-mm-focal-length camera on the main stellar spectrograph of the 6-m telescope of the Special Astrophysical Observatory at Nizhni Arkhyz during 1979-1981 are reported. The data are used to calculate radial velocities and orbital parameters based on both absorption and emission lines, and the results are compared in tables and graphs. In absorption, the system is found to have best-fit parameters P = about 35 d, K = about 35 km/s, V0 = about -5 km/s, e = 0.2, and f(M) = 0.15 solar mass. For P = 35 d, the emission-line velocities lead to unrealistic mass functions and e values of 0.6 for H-beta and 0.7 for H-alpha, indicating that these velocities are not associated with the (Be) optical component of the system.
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