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1998A&A...335..561T - Astronomy and Astrophysics, volume 335561-564 (1998/7-2)
Spectroscopic orbit of the ex-eclipsing binary SS Lacertae in the young open cluster NGC 7209.
TOMASELLA L. and MUNARI U.
Abstract (from CDS):
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 orbit has been derived, together with individual masses of the stars. SS Lac presents a moderately eccentric orbit and a probably full synchronization between stellar rotation and orbital revolution.
Abstract Copyright: ∼
Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: individual: SS Lacertae - open clusters: individual: NGC 7209
Simbad objects: 2
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