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SW Bootis - var-type: RRab
(with known Blazhko effect)
available observation results:
- Result JD 2452362
- Result JD 2452363
- Result JD 2452368
- Result JD 2452385
- publication: BAV Rundbrief 1-2004 (available only in german language with english abstract)
Abstract of the publication:
First CCD photometric measurements of the RRab star SW Bootis were obtained. Although the observed scatter in the reduced lightcurve may be interpreted as an indication for Blazhko effect, the fluctuations in brightness in maximum and minimum light are some 5-10 times lower then results from visual observations given in literature . Further observations will be needed to study that contradictory result.
The star is also known as showing quite a large secular period change . The recent CCD-observations revealed large (O-C) = +4.7 hours using elements from GCVS . So instantaneous elements derived from the new CCD observations (for the recent epoch after 2450000) are proposed: E0= 2452368.57 and P= 0.5134977 [d].
The mean "rise time" was (M-m)/P = 0.133 ± 0.019. This value did not vary much and showed no significant indication for irregularities. It is completely in agreement with the literature value of 0.126 . Also no statistically significant (O-C)-scatter has been identified from the CCD measurements.
References from the publication:
 Taylor, P.O., A New Look at SW Bootis, JAAVSO, 1977 p.56-58 (dort weitere Lit.-Hinweise)
 Bonov, A.D., Budapest Mitteil., 3, No. 38.
 Beljavski, S., Astron. Nachrichten 198, 371
 GEOS RR Lyrae stars database: http://webast.ast.obs-mip.fr/people/leborgne/dbRR/index.htm
 Kholopov, P.N. et al., General Catalogue of Var. Stars, 4th Ed., 1985-1988
 Barberá, R., Periodensuchprogramm AVE: http://www.astrogea.org/soft/ave/introave.htm
ACKNOWLEDGEMENT FOR DATA REFERENCE:
If results/data from this webpage are used as reference material, the following acknowledgement (or a similar one) is requested:
"We acknowledge the results/data obtained from the Dieter Husar Astronomical Online Database (www.dieter.husar.org)"