TYC 1722-498-1

Photoelectric Minima of Some Eclipsing Binary Stars We present 25 minima times of 12 eclipsing binaries.
Photoelectric observations of W UMa stars - U Pegasi and AB Andromedae The quadratic ephemerides of the W UMa systems U Pegasi and ABAndromedae are computed from photoelectric and photometric data toanalyze the objects' periodicities. The minima obtained for the presentwork are incorporated into the minima obtained by Lafta and Grainger(1986) for the quadratic ephemerides calculation. U Pegasi is found tohave a decreasing period with a rate of change of -0.91 s/century, whileAB Andromedae increases steadily at 0.83 s/century, and the existence ofa third unseen object is postulated.
The variable star U Pegasi. Not Available

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