Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
권호 표지
DOI QR코드

DOI QR Code

ROCHE MODEL AND ABSOLUTE DIMENSIONS OF THE ECLIPSING BINARY Y CAM WITH A PULSATING COMPONENT

맥동 식쌍성 Y Cam의 ROCHE 모형과 절대 물리량

  • Lee, J.W. (Department of Astronomy & Space Science, Chungbuk National University) ;
  • Kim, C.H. (Department of Astronomy & Space Science, Chungbuk National University) ;
  • Kim, S.L. (Korea Astronomy Observatory) ;
  • Youn, J.H. (Korea Astronomy Observatory) ;
  • Kwon, S.G. (Korea Astronomy Observatory)
  • Published : 2002.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

We performed CCD photometric observations of the eclipsing binary Y Cam with a pulsating component, for 16 nights from November 2000 to May 2001 using a V filter attached to the 61-cm reflector at Sobaeksan Optical Astronomy Observatory. Our V light curve and Broglia & Marin's (1974) BV ones were analyzed with Mode 2 for a detached Roche model as well as Model 5 for a semi-detached one in the Wilson-Devinney code. From the analysis, we found the following results: 1) It is hardly discernible from only light curve synthesis which model between the detached and semi-detached ones is a real Roche model of Y Cam. 2) There exist the third light of about 2% and 3% in B and V light curves of Y Cam, respectively. 3) The light curve solution is immune from the light variation due to the pulsation of the primary component of Y cam. However, the detached model rather than the semi-detached one has slightly better fitted to the observations which were get rid of the pulsation effect. 4) The absolute dimensions of Y Cam were calculated for two Roche models.

2000년 11월부터 2001년 5월까지 총 16일간 맥동 식쌍성 Y Carn을 소백산천문대의 61cm 망원경에 부착된 단일 V 필터로 CCD 측광을 수행하였다. 새롭게 얻은 V 광도곡선과 Broglia & Marin(1974)의 BV 광도곡선을 Wilson-Devinney 방법의 Mode 2(분리형)와 Mode 5(준분리형)으로 분석하였다. 분석 결과는 다음과 같다. 1) 광도곡선 분석만으로는 분리헝과 준분리형의 Roche 모형 중 어느 것이 Y Cam의 진실한 Roche 모형인가를 가려낼 수가 없다. 2) Y Cam의 B광도곡선에는 삼체의 광도가 약 2%, V광도곡선에는 약 3% 존재한다. 3) Y Cam의 주성에서 발생하는 맥동에 의한 밝기 변화는 광도곡선 해에 거의 영향을 주지 않으나, 맥동을 고려하였을 경우 분리형 모델이 준분리형 모델보다 약간 더 관측치를 잘 맞춘다. 4) 분리형과 준분리형 각각에 대해 Y Cam의 절대물리량을 계산하였다.

Keywords

References

  1. A&AS v.120 Borkovits, T.;Hegedus, T. https://doi.org/10.1051/aas:1996275
  2. A&A v.138 Broglia, P.;Conconi, P.
  3. A&A v.34 Broglia, P.;Marin, F.
  4. PASP v.97 Budding, E. https://doi.org/10.1086/131572
  5. Astron. Nachr. v.162 Ceraski, W.
  6. Princeton Contr. no.6 Dugan, R. S.
  7. ApJ v.469 Flower, P. J. https://doi.org/10.1086/177785
  8. A&A v.391 Kim, S.-L.;Lee, J. W.;Youn, J.-H.;Kwon, S.-G.;Kim, C. https://doi.org/10.1051/0004-6361:20020777
  9. BAN v.12 Kwee, K. K.;van Woerden, H.
  10. AJ v.90 Leung, K.;Zhai D.;Liu, Q;Yang, Y. https://doi.org/10.1086/113717
  11. A&AS v.39 Mezzetti, M.;Cester, B.;Giuricin, G.;Mardirossian, F.
  12. IBVS Mossakovskaya, L.
  13. ARA&A v.18 Popper, D. M. https://doi.org/10.1146/annurev.aa.18.090180.000555
  14. ApJ v.111 Struve, O.;Horak, H. G.;Ganavaggia, R.;Kourganoff, V.;Colacevich, A.
  15. Acta Astron. Szcepanowska, A.
  16. AJ v.106 Van Hamme, W.
  17. ApJ v.356 Wilson, R. E. https://doi.org/10.1086/168867
  18. Documentation of Eclipsing Binary Computer Model Wilson R. E.;K. C. Leung(ed.)
  19. ApJ v.166 Wilson, R. E.;Devinney, E. J. https://doi.org/10.1086/150986
  20. A&A v.48 Wilson, R. E.;Biermann, P.
  21. AJ v.76 Wood, D. B. https://doi.org/10.1086/111187

Cited by

  1. δ Sct-type pulsations in eclipsing binary systems: Y Cam vol.408, pp.4, 2010, https://doi.org/10.1111/j.1365-2966.2010.17055.x