Orbital Light Curve of the Peculiar Binary V Sagittae in Extended High States of Brightness

Details Orbital Light Curve of the Peculiar Binary V Sagittae in Extended High States of Brightness Orbital Light Curve of the Peculiar Binary V Sagittae in Extended High States of Brightness

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ap%26ss.272..333s&link_type=abstract

Astrophysics and Space Science, v. 272, Issue 4, p. 333-343 (2000).

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

We have analyzed the orbital modulation of V Sge in two intervals, each several years long, when the long-term light curve was relatively flat, in extended high state of brightness, and displayed just minor fluctuations. We used extensive sets of the visual AAVSO data. The two-sided moving averages with various values of Q were applied to the data folded with the orbital photometric phase - it allowed to pick out the general properties of the orbital component of the variations. We found that the modulation is always present but its shape near the secondary minimum (phase 0.5) remarkably varies for the two respective intervals. The secondary minimum is very prominent in one interval, but is almost absent in other interval. The standard deviation of brightness, computed for each bin of the folded light curve, displays variations through the orbital phase and has its minimum near phase 0.6. All these findings are confirmed for various values of Q. We argue that the source of the scatter of the orbital modulation is located in the lobe of the primary between its center and the L 1 point, shifted slightly from the line of centers of the stars.

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