산개성단 NGC 7209에 속한 쌍성 SS Lac

  • 강영운 (세종대학교 지구과학과, 대양천문대)
  • Published : 1997.12.01


We present IUE observations in far ultraviolet region for SS Lac in open cluster NGC 7209. The IUE short wavelength spectrum and long wavelength spectrum were merged to produce an energy distribution curve between $1200{AA}$ and $3200{AA}$. The curve has been unreddened to take out reddening effect. Then the surface temperature, gravity and abundance of SS Lac were determined based on the Kurucz model atmosphere. The photographic light curve produced before cessation of eclipse were analyzed for photometric solutions. We confirmed SS Lac is a member of open cluster NGC 7209 based on its possible distance. The main reason for the cessation of eclipse is the change of the system's orbital inclination rather than collisional merge of two stars.



  1. Izv. Pulkova Obs. v.24 no.3 Lavdovska, V. V.
  2. IBVS 3487 Zakirov. M. M;Azimov, A. A.
  3. Naval Obs. Publ. ⅩⅦ Hoag, A. A.;Johnson, H. L.;Iriarte, B.;Mitchell, R. I.;Hallam. K. L.;Sharpless, S.
  4. IBV 3610 Lehmann, T.
  5. I.A.P.P.P. v.59 Mossakovskaya, L. V.
  6. A. N. v.214 no.5113 Hoffmeister, C.
  7. ASP Conf. Ser. v.90 Schiller, S. J.;Milone, E. F.
  8. AJ v.104 Lacy, C. H.
  9. B.A.A.S. v.23 Schiller, S. J.;Milone, E. F.;Zakirov, M. M.;Azimov, A. A.
  10. Astron. Lett. v.19 Mossakovskaya, L. V.
  11. AJ v.44 Dugan, R. S.;Wright, F. W.
  12. Rev. Mex. AA v.28 Pena, J. H.;Peniche, R.
  13. Evolutionary Processes in Interacting Binary Stars Milone, E. F.;Stagg, C. R.;Schiller, S. J.;Y. Kondo(ed.);R. F. Sistero(ed.);R. S. Polidan(ed.)