DISCOVERY OF NEW RR LYRAE STARS IN THE CENTER OF THE GLOBULAR CLUSTER M53

  • Sohn, Sang-Mo (Center for Space Astrophysics, Yonsei University, Department of Astronomy, Yonsei University) ;
  • Rey, Soo-Chang (Center for Space Astrophysics, Yonsei University, Department of Astronomy, Yonsei University) ;
  • Lee, Young-Wook (Center for Space Astrophysics, Yonsei University, Department of Astronomy, Yonsei University) ;
  • Byun, Yong-Ik (Center for Space Astrophysics, Yonsei University, Department of Astronomy, Yonsei University) ;
  • Chun, Mun-Suk (Department of Astronomy, Yonsei University)
  • 발행 : 1999.12.01

초록

We report the discovery of 17 new RR Lyrae variables in the central region ($\rleq1'$) of the globular cluster M53. There candidates were identified by using the Welch & Stetson (1993) technique and confirmed by checking individual light curves in both B and V bands. The color-magnitude diagram of the horizontal-branch stars in the central region is compared with that for stars observed in the outer region by Rey et al. (1998). Including the new data from this study, we estimate the fraction of c typeRR Lyrae variables, n(c)/n(ab + c), to be 0.43 which agrees well with the valuse of other Oosterhoff group II clusters.

키워드

참고문헌

  1. AJ v.116 Rey, S.-C.;Lee, Y.-W.;Byun, Y.-I.;Chun, M.-S.
  2. Publ. David Dunlop Obs. v.3 no.6 Sawyer Hogg, H.
  3. PASP v.102 Stetson, P. B.
  4. Ph.D. thesis, Yonsei University Rey, S.-C.
  5. ApJ v.350 Lee, Y.-W.;Demarque, P.;Zinn, R. J.
  6. AJ v.293 Zinn, R. J.
  7. PASP v.99 Stetson, P. B.
  8. ASP Conf. Ser. v.25 Astronomical Data Analysis Software and Systems I Stetson, P. B.;D. M. Worrall(ed.);C. Biemesderfer(ed.);J. Barnes(ed.)
  9. RR Lyrae Stars Smith, H. A.
  10. IAU Colloquium. v.136 Stellar Photometry-Current Techniques and Future Developments Stetson, P. B.;C. J. Butler(ed.);I. Elliot(ed.)
  11. ApJ v.252 Sandage, A.
  12. AJ v.105 Welch, D. L.;Stetson, P. B.