منابع مشابه
Spectral variability of the binary HR 4049 ⋆ ⋆ ⋆
The C I, Na I D, and Hα lines of the postAGB binary HR 4049 have been studied. Na I D variability results from a photospheric absorption component ([Na/H]=−1.6 ± 0.2) which follows the velocity of the primary and a stationary, non-photospheric component. An emission component is attributed to the circumbinary disc, and an absorption component to mass-loss from the system with a velocity of 5.3±...
متن کاملSpectroscopic orbit of the ex - eclipsing binary SS Lac in the young open cluster NGC 7209
The no-longer-eclipsing system SS Lac in the young open cluster NGC 7209 has been recently announced to show a constant radial velocity. Puzzled by this finding, we have monitored the system during 1997 obtaining 24 Echelle+CCD spectra over 8 orbital revolutions. Our spectra reveal a nice orbital motion with periodic splitting and merging of spectral lines from both components. An accurate orbi...
متن کاملA spectroscopic study of the magnetic CP - star HR 1094 ?
The chemically peculiar star HR 1094 has been investigated with respect to its chemical composition and the magnetic influence on its stellar spectrum. By using spectral lines slightly affected by the field v sin i was determined to be ≤ 17 km s −1. The iron-group elements as well as chlorine and the heavy elements platinum, gold and mercury show an overabundance compared to the sun. The analys...
متن کاملThe orbit of the close spectroscopic binary ε Lup and the intrinsic variability of its early B - type components ⋆ , ⋆ ⋆
We subjected 106 new high-resolution spectra of the double-lined spectroscopic close binary εLup, obtained in a time-span of 17 days from two different observatories, to a detailed study of orbital and intrinsic variations. We derived accurate values of the orbital parameters. We refined the sidereal orbital period to 4. 55970 days and the eccentricity to e = 0.277. By adding old radial velocit...
متن کاملHipparcos Astrometric Orbit and Evolutionary Status of Hr 6046
The previously known, 6-yr spectroscopic binary HR 6046 has been speculated in the past to contain a compact object as the secondary. A recent study has re-determined the orbit with great accuracy, and shown that the companion is an evolved but otherwise normal star of nearly identical mass as the primary, which is also a giant. The binary motion was detected by the Hipparcos mission but was no...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1982
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/199.2.303