2002PASP..114..650Q -
Publ. Astron. Soc. Pac., 114, 650-655 (2002/June-0)
Orbital period studies of two algol-type eclipsing binary systems: TY Pegasi and X Trianguli.
QIAN S.
Abstract (from CDS):
O-C curves of two EA-type eclipsing binaries, TY Peg and X Tri, are formed and studied in detail based on all available times of light minimum. For TY Peg, it was discovered that the general trend of the O-C curve showed a downward parabolic variation, which indicates a secular period decrease with rate at dP/dt=-1.16x10–6 days.yr–1. When the secular decrease is removed from the O-C curve, the residuals can be described by several linear ephemerides, suggesting several sudden period jumps. For the other one, X Tri, it is found that the general O-C trend also indicates a secular period decrease (dP/dt=-1.42x10–7 days.yr–1), and several irregular period jumps are found to superpose on the long-time period decrease. This kind of period change, irregular sudden jumps superposed on secular decrease, is typical for many other Algol-type binary systems such as TU Her, UU And, Z Per, Y Psc, BO Mon, FH Ori, RT Per, and TX UMa. The period changes of these systems may be caused by orbital angular momentum loss via variable magnetic coupling and gravity coupling between the components.
Abstract Copyright:
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Journal keyword(s):
Stars: Binaries: Close - stars: individual (TY Pegasi) - stars: individual (X Trianguli) - Stars: Mass Loss
Simbad objects:
10
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