Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ap%26ss.259..285p&link_type=abstract
Astrophysics and Space Science, v. 259, Issue 3, p. 285-293 (1998).
Astronomy and Astrophysics
Astrophysics
5
Scientific paper
XY Leo (BD+18° 2307, p = 0d .28) was observed each season from 1992 through 1995 at Yunnan Observatory with the 1 m telescope and 37 new heliocentric times of minimum light were determined. The newly expanded database of the minimum times,including these new epochs, definitely confirm the sine-like variation of its O-C values. Observations and analyses strongly supported the viewpoint that the variation of the O-C values of the minimum times is mainly caused by the light- time effect. Based on this newly expanded database, new light elements for the eclipsing system XY Leo and new light-time orbit for this complex system have been obtained with much better accuracy than before by means of the least squares fitting to the light-time equation. It's also noted that the additional period variation for XY Leo probably may not be ruled out besides the light-time effect. The method of analysis and the discussion of the results are presented in this paper.
Cao Ming
Pan Lian-De
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