Eclipsing Binaries in the Open Cluster NGC 2243. II. Absolute Properties of NVCMa

• Autorzy: Kaluzny J. , Pych W. , Rucinski S. M. , Thompson I. B.
• Języki publikacji: EN

Abstrakty

EN

We present echelle spectroscopic data for five eclipsing binary stars and two giant stars in the field of the open cluster NGC 2243. The average cluster velocity is determined to be +60.4±0.6 km/s. Four of the eclipsing binaries are very likely members of the cluster based on their observed radial velocities. The absolute parameters of cluster member NV CMa are determined by analyzing photometric and radial velocity data. We obtain 1.089±0.010 M_solar and 1.221±0.031 R_solar for the primary, and 1.069±0.010 M_solar and 1.178±0.037 R_solar for the secondary. Both components of the binary are located on the Main Sequence, about 1 mag below the turn-off point on the cluster color-magnitude diagram. Using model age-luminosity and age-radius relations we obtain 4.35±0.25 Gyr for the age of NV CMa. The derived age is, however, very sensitive to the adopted metallicity of the cluster. We demonstrate that a meaningful determination of the ages of objects like NV CMa based on evolutionary models is possible only if their metallicity is known with a relative accuracy of a few percent. The distance moduli calculated for the components of NV CMa agree closely with each other, and imply an apparent distance modulus of the cluster of (m-M)V=13.24±0.08 mag.

Słowa kluczowe

EN

binaries: eclipsing; Stars: individual: NV CMa; open clusters and associations: individual: NGC 2243

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2006
• Tom: Vol. 56, No. 3
• Strony: 237--252
• Opis fizyczny: Bibliogr. 24 poz., tab., wykr.

Twórcy

autor

Kaluzny J.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Pych W.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Rucinski S. M.

• David Dunlap Observatory, Department of Astronomy and Astrophysics, University of Toronto, P.O. Box 360, Richmond Hill, ON L4C 4Y6, Canada

autor

Thompson I. B.

• Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

Bibliografia

• Anthony-Twarog, B.J., Atwell, J., and Twarog, B.A. 2005, Astron. J., 129, 872.
• Bergbusch, P.A., Vandenberg, D.A., and Infante, L. 1991, Astron. J., 101, 2102.
• Bernstein, R., Shectman, S.A., Gunnels, S.M., Mochnacki, S., and Athey, A.E. 2003, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes. Eds: Iye, Masanori; Moorwood, Alan F.M., Proceedings of the SPIE, 4841, 1694.
• Bonifazi, F., Fusi Pecci, F., Romeo, G., and Tosi, M. 1990, MNRAS, 245, 15.
• Friel, E.D., Janes, K.A., Tavarez, M., Scott, J., Hong, L., and Miller, N. 2002, Astron. J., 124, 2693.
• Gratton, R.G. 1982, Astrophys. J., 257, 640.
• Gratton, R.G., and Contarini, G. 1994, Astron. Astrophys., 283, 911.
• Hawarden, T.G. 1975, MNRAS, 173, 801.
• Irwin, J.B 1962, in: “Astronomical Techniques”, Ed. W.A. Hiltner, The University of Chicago Press, p. 584.
• Kaluzny, J., Krzeminski, W., and Mazur, B. 1996, Astron. Astrophys. Suppl. Ser., 118, 303 (KKM).
• Kaluzny, J., Krzeminski,W., Thomspon, I.B., and Stachowski, G. 2006, Acta Astron., 56, 51(KKTS).
• Kelson, D.D. 2003, P.A.S.P., 115, 688.
• Kelson, D.D. 2006, Astron. J., submitted.
• Mathieu, R.D. 2005, in: ASP Conf. Ser., Tidal Evolution and Oscillations in Binary Stars, Eds. A. Claret, A. Gimenez and J.-P. Zah (San Francisco: ASP), 333, 26.
• Muterspaugh,M.W., Lane, B.F., Konacki,M., Burke, B.F., Colavita,M.M., Kulkarni, S.R., and Shao, M. 2005, Astron. J., 130, 2866.
• Nordstrom, B., et al. 2004, Astron. Astrophys., 419, 989.
• Plewa, T. 1988, Acta Astron., 38, 415.
• Pȓsa, A., and Zwitter, T. 2005, Astrophys. J., 628, 426.
• Ramírez, I., and Meléndez, J. 2005, Astrophys. J., 626, 465.
• Rucinski, S.M. 2002, Astron. J., 124, 1746.
• VandenBerg, D.A., and Clem, J.L. 2003, Astron. J., 126, 778.
• VandenBerg, D.A., Bergbusch, P.A., and Dowler, P.D. 2006, Astrophys. J. Suppl. Ser., 162, 375.
• van Hamme, W. 1993, Astron. J., 106, 2096.
• Wilson, R.W., and Devinney, E.J. 1971, Astrophys. J., 166, 605.