dc.contributor.author | Østensen, R. | |
dc.contributor.author | Solheim, Jan Erik | |
dc.contributor.author | Johannessen, F. | |
dc.date.accessioned | 2009-08-14T09:25:35Z | |
dc.date.available | 2009-08-14T09:25:35Z | |
dc.date.issued | 2001-10-09 | |
dc.description.abstract | We report the discovery of an eclipsing binary
– HS 0705+6700 – being an sdB star with a faint companion.
From its light curve the orbital period of 8263.87 s,
the mass ratio of the system q = 0.28, the inclination of
84.◦4 and other system parameters are derived. The companion
does not contribute to the optical light of the system
except through a strong reflection effect. The semiamplitude
of the radial velocity curve K1 = 85.8 kms−1
and a mass function of f(m) = 0.00626M⊙ are determined.
A spectroscopic analysis of the blue spectra results
in Teff = 28 800K, log g = 5.40, and log(nHe/nH) =
−2.68. These characteristics are typical for sdB stars, as is
its mass of 0.48M⊙. According to its mass (0.13M⊙) and
radius (0.19R⊙), the companion is an M dwarf. The primary
is in a core helium burning phase of evolution, and
the system must have gone through a common envelope
stage when the primary was near the tip of the red giant
branch. | en |
dc.description | This is the authors' manuscript | en |
dc.format.extent | 892808 bytes | |
dc.format.mimetype | application/pdf | |
dc.identifier.citation | Astronomy and Astrophysics | en |
dc.identifier.uri | https://hdl.handle.net/10037/2040 | |
dc.identifier.urn | URN:NBN:no-uit_munin_1792 | |
dc.language.iso | eng | en |
dc.rights.accessRights | openAccess | |
dc.subject | VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438 | en |
dc.subject | subdwarfs – binaries | en |
dc.subject | spectroscopic – stars | en |
dc.subject | early-type – stars | en |
dc.subject | fundamental parameters – stars | en |
dc.subject | eclipsing – binaries | en |
dc.subject | individual: HS 0705+6700 | en |
dc.title | HS 0705+6700: a new eclipsing sdB binary | en |
dc.type | Journal article | en |
dc.type | Tidsskriftartikkel | en |