FUSE Observations of EC14026 Stars
Tóm tắt
We present a FUSE abundance analysis of EC14026 stars. We compare the abundances of heavy elements in the atmospheres of EC14026 stars to non-pulsating stars with similar atmospheric parameters, and investigate whether weak stellar winds could explain the coexistence of variable and non-variable sdB stars in the log g – Teff diagram. We also present preliminary results on time-dependent diffusion calculations of iron in presence of radiative levitation and mass loss, and show how weak stellar winds can affect the diffusive equilibrium between gravitational settling and radiative support.
Tài liệu tham khảo
Bergeron, P., Wesemael, F., Michaud, G. and Fontaine, G.: 1988,ApJ 332, 964.
Bill‘eres, M., Fontaine, G., Brassard, P. and Liebert, J.: 2002, ApJ 578, 515.
Charpinet, S., Fontaine, G. and Brassard, P.: 2001, PASP 113, 775.
Charpinet, S., Fontaine, G., Brassard, P., Chayer, P., Rogers, F.J., Iglesias, C.A. and Dorman, B.: 1997, ApJ 483, L123.
Fontaine, G. and Chayer, P.: 1997, in: A. Philip, J. Liebert, and R. Saffer (eds). Third Conf. on Faint Blue Stars (Schenectady: Davis), 169.
Kilkenny, D., Koen, C., O’Donoghue, D. and Stobie, R.S.: 1997, MNRAS 285, 640.
Koen, C., Kilkenny, D., O’Donoghue, D., van Wyk, F. and Stobie, R.S.: 1997, MNRAS 285, 645.
Michaud, G., Bergeron, P., Heber, U. and Wesemael, F.: 1989, ApJ 338, 417.
Michaud, G., Bergeron, P., Wesemael, F. and Fontaine, G.: 1985, ApJ 299, 741.
O’Donoghue, D., Lynas-Gray, A.E., Kilkenny, D., Koen, C. and Stobie, R.S.: 1997, MNRAS 285, 657.
O’Toole, S.J., Heber, U., Chayer, P., Fontaine, G., O’Donoghue, D. and Charpinet, S.: 2004, in: P.F.L. Maxted (eds.), Extreme Horizontal Branch Stars and Related Objects, Ap&SS 291, 427.
Stobie, R.S., Kawaler, S.D., Kilkenny, D., O’Donoghue, D. and Koen, C.: 1997, MNRAS 285, 651.
Unglaub, K. and Bues, I.: 1998,A&A 338, 75.