BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars Cataclysmic Variables Circular No.17 1994, September 24 Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM Internet: tvm@lms.be TEL. 32-11-831504 P. Van Cauteren, de Borrekenslaan 54, 2630 Aartselaar, BELGIUM 73064.1123@compuserve.COM TEL. 32-3-8774098 =================================================================== DX And [UG, 10.9p - 16.4p] ========================== Tonny Vanmunster, Landen, Belgium reports an outburst of this dwarf nova. An independent outburst detection report has been received from Jochen Pietz, Germany. The two observations are given below : 1994 Sep 23.833 UT, 12.6 (T. Vanmunster, 0.35-m refl, seq AAVSO); Sep 23.872 UT, 12.3 (J. Pietz, 0.20-m SCT, seq AAVSO); The previous outburst of this cataclysmic variable was detected more than one year ago, on August 12, 1993, by Tonny Vanmunster. It reached mag 10.8 at that occasion. Spectroscopic and photometric observations of DX And, as well as its physical parameters, are discussed in length in [1]. V1113 Cyg [UGSU, 14p - <17p] ============================ Further observations of the present outburst are summarized in the table below. ------------------------------------------------------------------------ DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1994 09 10.940 [14.0 mv * Poyner, G. 22-cm refl. Mail(poy) 1994 09 11.017 14.1 mv VJ * Broens, E. 35-cm refl. VVS 1994 09 12.8 14.4 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 12.853 14.4 mv VJ * Vanmunster, T. 35-cm refl. VVS 1994 09 12.927 14.3: mv VJ * Broens, E. 35-cm refl. VVS 1994 09 15.017 14.6 mv VJ * Vanmunster, T. 35-cm refl. VVS 1994 09 16.056 15.0 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 17.006 14.8 mv * Poyner, G. 40-cm refl. Mail(poy) VJ = VSOLJ sequence (T. Kato) dd. 94.09.02 (frame DP92637). UZ Boo [UGWZ, 11.5v - 20.4V] ============================ No further positive observations of this dwarf nova have been received. The photometric summary below, which lists new observations since CVC No.16, concludes our monitoring action. In total, we received over 140 observations from observers all over the world. The corresponding light curve is breath taking : first it shows the brightening phase (max. mag. 11.6 at JD 9583), followed by an almost linear decline (approx. 0.15 mag/day) between JD 9583 & JD 9597. Then comes a dramatic fading, and finally the two most extra-ordinary features appear : one mini-outburst around JD 9602, followed by a second one around JD 9606. The data have been submitted to professional astronomers for further analysis. ------------------------------------------------------------------------ DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1994 09 05.829 [13.3 mv AA * Diepvens, A. 15-cm refr. VVS 1994 09 11.421 [13.4 mv * Makiguchi, N. 25-cm refl. Mail(kat) 1994 09 12.8 [14.3 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 12.817 [14.3 mv AA * Vanmunster, T. 35-cm refl. VVS 1994 09 12.833 [13.3 mv AA * Broens, E. 35-cm refl. VVS 1994 09 14.450 [13.4 mv * Takenaka, Y. 20-cm SCT Mail(kat) V344 Lyr [UGSU, 14.5p - <20p] ============================= Following the outburst announcement in CVC No.16, we received an independent outburst detection report from L. Szentasko, Veresegyhaz, Hungary, who observed V344 Lyr on Sept. 08.81 UT at mag. 14.9. The present outburst, which was a normal one, is summarized in the table below. New entries since CVC No.16 are labelled with an '*'. ------------------------------------------------------------------------ DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1994 09 06.918 [14.8 mv TA Poyner, G. 40-cm refl. Mail(poy) 1994 09 07.8 [14.2 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 08.81 14.9 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 09.186 14.8 mv AA York, D. 45-cm refl. priv(yor) 1994 09 10.190 15.2 mv AA York, D. 45-cm refl. priv(yor) 1994 09 11.8 [14.8 mv AA * Szentasko, L. 33-cm refl. Mail(tep) 1994 09 12.841 [14.8 mv AA * Broens, E. 35-cm refl. VVS IR Lyr [UG?, 14.6p - 16.0p] =========================== Since our publication of a photometric summary in CVC No.8, this remarkable variable has started to fade, as indicated by the list of observations in the table below. This fading, as well as the expected rise are crucial elements for determining the true nature of this variable. Observers are therefore urged to keep on monitoring IR Lyr. A rough inspection of the data published in our CVC's already clearly indicates IR Lyr is NOT an UG star [despite its current classification in professional references]. ------------------------------------------------------------------------ DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE ------------------------------------------------------------------------ 1994 07 05.996 14.5 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 07.956 14.4 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 08.950 14.0 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 09.986 14.1 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 10.012 14.3 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 10.980 14.6 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 11.947 14.0 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 12.950 14.0 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 13.939 14.1 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 15.951 14.4 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 16.953 14.6 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 17.960 14.6 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 19.958 [14.2 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 21.941 [14.1 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 07 29.937 [14.2 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 07 30.981 [14.7 mv GS * Poyner, G. 40-cm refl. priv(poy) 1994 08 01.946 14.4 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 02.913 14.2 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 03.911 14.4 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 04.946 14.3: mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 08.914 14.5 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 08.920 14.6 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 13.902 14.9 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 14.908 14.7: mv GS * Vanmunster, T. 35-cm refl. VVS 1994 08 17.934 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 19.922 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 23.913 14.9 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 29.969 15.1 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 30.874 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 08 30.888 [14.5 mv GS * Vanmunster, T. 35-cm refl. VVS 1994 09 01.985 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 09 05.953 [14.7 mv GS * Broens, E. 35-cm refl. VVS 1994 09 06.919 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) 1994 09 16.973 [14.7 mv GS * Poyner, G. 40-cm refl. Mail(poy) References ---------- [1] Drew, J.E. et al., 1993, MNRAS, 260, 803-818 Tonny Vanmunster