Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47...68f&link_type=abstract
Astronomy Reports, vol. 47, Issue 1, p.68-74
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The results of hydrodynamical calculations of radially pulsating helium stars with masses 0.5M &sun;≤M≤0.9M &sun;, bolometric luminosities 600L &sun;≤5×103 L &sun;, and effective temperatures 1.5×104 K≤T eff≤3.5×104 K are presented. The pulsation instability of these stars is due to the effects of ionization of iron-group elements in layers with temperatures T˜2×105 K. The calculations were carried out using opacities for the relative mass abundances of hydrogen and heavy elements X=0 and Z=0.01, 0.015, and 0.02. Approximate formulas for the pulsation constant Q over the entire range of pulsation instability of the hot helium stars in terms of the mass M, radius R, effective temperature T eff, and heavy-element abundance Z are derived. The instability of BX Cir to radial pulsations with the observed period Π=0.1066 d occurs only for a mass M≥0.55M &sun;, effective temperature T eff≥23000 K, and heavy-element abundance Z≥0.015. The allowed mass of BX Cir is in the range 0.55M &sun;≤M≤0.8M &sun;, which corresponds to luminosities 800L &sun;≤M≤1400L &sun; and mean radii 1.7R &sun;≲R≲2.1R &sun;.
Fadeev Yu. A.
Novikova M. F.
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