SPECTROSCOPIC ORBIT OF THE EX-ECLIPSING BINARY SS-LACERTAE IN THE YOUNG OPEN CLUSTER NGC-7209

Authors
TOMASELLA L MUNARI U
Citation
L. Tomasella et U. Munari, SPECTROSCOPIC ORBIT OF THE EX-ECLIPSING BINARY SS-LACERTAE IN THE YOUNG OPEN CLUSTER NGC-7209, Astronomy and astrophysics (Berlin), 335(2), 1998, pp. 561-564
Citations number
26
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics (Berlin) → ACNP
ISSN journal
00046361
Volume
335
Issue
2
Year of publication
1998
Pages
561 - 564
Database
ISI
SICI code
0004-6361(1998)335:2<561:SOOTEB>2.0.ZU;2-O
Abstract
The no-longer-eclipsing system SS Lac in the young open cluster NGC 72 09 has been recently announced to show a constant radial velocity. Puz zled by this finding, we have monitored the system during 1997 obtaini ng 24 Echelle+CCD spectra over 8 orbital revolutions. Our spectra reve al a nice orbital motion with periodic splitting and merging of spectr al lines from both components. An accurate orbit has been derived, tog ether with individual masses of the stars. SS Lac presents a moderatel y eccentric orbit and a probably full synchronization between stellar rotation and orbital revolution.