IT Her - ein W-UMa-Stern mit Periodenaenderung

Details IT Her - ein W-UMa-Stern mit Periodenaenderung IT Her - ein W-UMa-Stern mit Periodenaenderung

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011bavsr..60....9m&link_type=abstract

BAV Rundbrief 1/2011, vol. 60, p. 9-11

Physics

Eclipsing Binary

Scientific paper

CCD observations of IT Her (GSC 2112 1845) were obtained at my private observatory over
a period of 7 nights during 2010. 704 images were collected. They confirm, that IT Her
is an eclipsing binary of type EW with an amplitude of 0.45 mag as already shown by
Schmidt et al.,(1996), Diethelm (1999) and Kreiner (2004). Its period is not stable
but extended, with the best elements:
JD 24452500.0940 + 0.3393964 d*E.
The secondary minimum is at phase 0.5. Both minima show a contstant brightness of
0.025 +-0.003 d.

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