BBSAG BULLETIN. May 1 st, LIST OF MINIMA OF ECLIPSING BINARIES

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1 BBSAG BULLETIN 127 May 1 st, LIST OF MINIMA OF ECLIPSING BINARIES The following table lists 172 electronically recorded (CCD; underlined) and 133 visual timings of minima of eclipsing binaries obtained primarily between November 2001 and March 2002 by the following observers: LB EBl RD KL CPa APs KT JVb Luigi Baldinelli, Alessandro Maitan, Paolo Pizzinato Observatory Sasso Marconi, Italy Ernst Blaettler, Wald, Switzerland, blaettler-wald@bluewin.ch Roger Diethelm, R. Szafraniec Observatory, Metzerlen, Switzerland, diethelm@astro.unibas.ch Kurt Locher, Grüt, Switzerland, locher@tommasi.ch Carlo Pampaloni, Firenze, Italy Anton Paschke, Rüti, Switzerland, Anton@Paschke.com Kari A. Tikkanen, Oulu, Finland, ktikkane@mail.student.oulu.fi Jacqueline Vandenbroere, Heure, Belgium, J.vandenbroere@skynet.be The O-C values given in the table below generally refer to the linear elements of the GCVS 1985, with the remarked exceptions. For the determinaton of the time of the minima, the tracing paper method was employed. For the reduction of some of the electronic observations, software based on the Kwee-van Woerden algorithm was used. All times are UTC. The complete set of BBSAG Bulletins is now available in the PDF-format at

2 37489 TT And p EBl CCD UU And p KL XZ And p KL p RD CCD AA And p EBl CCD s EBl CCD AD And p APs CCD p EBl CCD DO And s RD CCD; elem. MVS 11, EP And p KL EX And p EBl CCD p RD CCD LO And p EBl CCD; elem. GEOS EB No CX Aqr p KL CZ Aqr p KL GK Aqr s KL elem. Per. Zv. 22, RY Aur p KL p EBl CCD RZ Aur p RD CCD CL Aur p KL EI Aur s EBl CCD s RD CCD EP Aur p EBl CCD; elem. IBVS No KU Aur p KL p EBl CCD V404 Aur p EBl CCD; elem. IBVS No p RD CCD TU Boo s KL elem. A&AS 117, XY Boo p EBl CCD; elem. AJ 76, p EBl CCD AD Boo s RD CCD; elem. Chin. AA 6, AQ Boo s EBl CCD; elem. IBVS No p EBl CCD AR Boo p EBl CCD; elem. IBVS No p EBl CCD - 1 -

3 37524 GSC2565: RD CCD 331 Boo Y Cam p KL AV Cam p JVb CP Cam s RD CCD; elem. Hipparcos RY Cnc p KL VV CVn s EBl CCD; GCVS elem. in need of revision p EBl CCD p EBl CCD s EBl CCD YZ CVn p EBl CCD BI CVn p EBl CCD; elem. IBVS No s EBl CCD GSC2530 s RD CCD; elem. IBVS No :2276 CVn GSC RD CCD :370 CVn GSC2534 p RD CCD; see note p :216 CVn s RD CCD GSC2536 s RD CCD :122 CVn p RD CCD EE CMa p KL AK CMi p KL RZ Cas p KT p KT p KT p KT p KT p KT p KT p KT p KT p KT p KT AB Cas p KL AE Cas p KL AH Cas p RD CCD EG Cas s EBl CCD IR Cas p KL LU Cas p RD CCD NT Cas p RD CCD - 2 -

4 37562 V336 Cas p EBl CCD V344 Cas p EBl CCD V345 Cas p RD CCD V361 Cas p RD CCD V366 Cas p RD CCD; elem. IBVS No V384 Cas p RD CCD V387 Cas p RD CCD p RD CCD V411 Cas p RD CCD V448 Cas p RD CCD V520 Cas s EBl CCD; elem. BBSAG Bull. 117, V523 Cas s KL elem. MNRAS 317, NSV1012 s JVb elem. IBVS No Cas BE Cep s EBl CCD BR Cep p KL p RD CCD CM Cep p KL DP Cep p RD CCD GI Cep p RD CCD HI Cep p KL elem. BBSAG Bull. 114, IM Cep p EBl CCD IO Cep p RD CCD p KL NU Cep p JVb p JVb V357 Cep p RD CCD; elem. Brno Contr. 28, V358 Cep p KL elem. BBSAG Bull. 96, SS Cet p KL TW Cet s KL VY Cet p KL AA Cet p KL LL Com p EBl CCD; elem. IBVS No

5 37594 W Crv p KL V Crt p KL UW Cyg p KL WZ Cyg p LB CCD ZZ Cyg p KL AE Cyg p LB CCD CG Cyg p LB CCD V456 Cyg p LB CCD V498 Cyg p RD CCD V745 Cyg p JVb p JVb p JVb TT Del p KL Z Dra p KL TW Dra p KT p KT p KT normal min p KT normal min AR Dra p KL CK Dra p JVb DW Dra p KL elem. BBSAG Bull. 118, FU Dra p RD CCD; elem. Hipparcos KK Dra p KL elem. JAAVSO 28, TZ Eri p KL RW Gem p KL TX Gem p KL TZ Gem p EBl CCD AF Gem p KL AH Gem RD CCD; GCVS elem. in need of revision AV Gem s EBl CCD AZ Gem p EBl CCD BO Gem p KL CK Gem p RD CCD - 4 -

6 37627 CW Gem p EBl CCD; elem. BAV M EN Gem p : : 12 EBl CCD EY Gem p EBl CCD FT Gem p EBl CCD GX Gem p EBl CCD; elem. BBSAG Bull. 125, KQ Gem p EBl CCD LO Gem p JVb elem. IBVS No QW Gem p EBl CCD; elem. Hipparcos SZ Her p KL CC Her p KL DQ Her p KL MT Her p KL V733 Her p RD CCD V861 Her s RD CCD; elem. IBVS No GSC2056 s KL :117 Her p KL s KL GSC2604 p KL elem. IBVS No :1671 Her s KL s KL p KL p KL GSC3073 s KL elem. IBVS No :837 Her s KL p KL p KL p KL p KL s KL p KL RX Hya p KL TY Hya p RD CCD VY Hya p KL AL Hya p KL AS Hya p KL elem. BBSAG Bull. 83, AG Lac s EBl CCD s EBl CCD - 5 -

7 37664 CG Lac p EBl CCD CN Lac s EBl CCD p EBl CCD CO Lac s EBl CCD; diplaced secondary EM Lac s EBl CCD p EBl CCD HR Lac p EBl CCD HX Lac p EBl CCD IM Lac p RD CCD IP Lac s EBl CCD NR Lac s EBl CCD NW Lac p RD CCD p EBl CCD PP Lac p EBl CCD OO Lac p KL s EBl CCD V339 Lac p : +0.11: 26 EBl CCD V342 Lac s EBl CCD p EBl CCD V344 Lac p EBl CCD; elem. see p p EBl CCD s EBl CCD Y Leo p KL p RD CCD VZ Leo p RD CCD BL Leo p KL RS Lep p KL TY Lib p KL RV Lyn p RD CCD; normal minimum GSC3123 s KL elem. IBVS No :1618 Lyr RW Mon p KL TV Mon p RD CCD BH Mon p RD CCD - 6 -

8 37697 BM Mon p KL FH Mon p KL FV Mon p : : 7 RD CCD GU Mon p RD CCD IX Mon p RD CCD V396 Mon s RD CCD V455 Mon p EBl CCD V524 Mon p EBl CCD V681 Mon p KL elem. BBSAG Bull. 75, V714 Mon p EBl CCD; elem. IBVS No V449 Oph p KL V508 Oph p KL DW Ori p RD CCD DZ Ori p EBl CCD; elem. BBSAG Bull. 117, EQ Ori p KL FL Ori p KL FR Ori p EBl CCD FT Ori p RD CCD FZ Ori s EBl CCD V640 Ori p KL V641 Ori p EBl CCD s EBl CCD V668 Ori p EBl CCD TY Peg p KL BX Peg p LB CCD BY Peg p EBl CCD DP Peg p EBl CCD; elem. IBVS No EY Peg p RD CCD; elem. BBSAG Bull. 105, RT Per p KL RV Per p KL - 7 -

9 37727 ST Per p KL XZ Per p KL DK Per p KL elem. IBVS No p EBl CCD DZ Per p EBl CCD HK Per p RD CCD HS Per p RD CCD; e. IBVS No. 3754; see note p KL Per p RD CCD KW Per p KL LS Per p RD CCD PS Per p RD CCD p KL V364 Per s EBl CCD V365 Per p RD CCD V450 Per p EBl CCD V457 Per p RD CCD V462 Per p RD CCD XZ Pup p KL AO Ser p KL AU Ser s KL LX Ser p KL RW Tau p KL TY Tau s RD CCD WY Tau s EBl CCD AC Tau p KL AH Tau s KL AM Tau p EBl CCD p KL CR Tau p EBl CCD; elem. IBVS No ES Tau p KL p RD CCD HU Tau s CPa - 8 -

10 37759 V781 Tau p EBl CCD V1112 Tau s RD CCD; elem. IBVS No V Tri p KL RV Tri p KL RW Tri p KL TW UMa p RD CCD UX UMa p KL XZ UMa p KL ZZ UMa p KL AA UMa s RD CCD AC UMa p KL AN UMa s APs CCDR p APs CCDR s APs CCDR p APs CCDR ES UMa p RD CCD; elem. IBVS No RZ UMi s RD CCD; elem. BBSAG Bull. 111, UW Vir p KL VV Vir p KL AK Vir p KL AW Vir s EBl CCD AX Vir p RD CCD AZ Vir s EBl CCD HW Vir p KL elem. A&A 364, NY Vir p EBl CCD; elem. MNRAS 296, p EBl CCD s EBl CCD p EBl CCD s EBl CCD p EBl CCD BE Vul p KL BI Vul s EBl CCD BK Vul p EBl CCD BU Vul p LB CCD p LB CCD Notes on observations given in Table above - 9 -

11 Notes on observations given in Table above GSC2534:216 CVn This variable, recently discovered by the ROTSE1 team, is the brighter star of a close pair, the companion beeing of about 15 th magnitude. HS Per Our CCD observation of HS Per = GSC3692:1540 at 01 h 52 m 11.6 s, (J2000.0) yield a duration of totality amounting to d d (0.015 p p ). R. Diethelm Errata Bulletin Nr. star corrected value WY Cep name of constellation GSC3921:1531 digit in GSC label /17 GSC3121:1799 is named variable V400 Lyrae CCD light curve and new elements of variation for V344 Lacertae During the last observing season, we have gathered CCD data (unfiltered) of the EW type eclipsing binary V344 Lacertae that cover the entier light curve. These observations can be brought in accordance with the initial time of minimum E 0 given in the GCVS with a period value of days. The following Figure shows our measurements folded with the new elements of variation as mentioned in the caption. For the time between the initial minimum and the date of our observations, only two electronically determined minimum timings are given in the literature (JD and JD ), both of which show a negative O-C value surpassing the accuracy of the timing. This might indicate that the O-C diagram of V344 Lacertae can be best represented by a parabolic term with a gradual lengthening of the period. Further observations should be obtained in order to verify this suggestion. V344 Lac: * E Phase E. Blättler

12 Visual observations of V355 Andromedae The bright eclipsing binary V355 Andromedae was discovered by the Hipparcos satelite, finding it below maximum light at JD , and No elements could be derived. We observed V355 And visually with binoculars from 2001-Dec-13 to 2002-Feb-4. These observations, together with the Hipparcos normal minimum of JD (10), yield the elements Min(JD,hel) = (8) (2) * E as the most likely representation of the variation of V355 And. The following Figure shows our data. R.H. Chambers of the BAA-VSS observed a probable primary minimum at JD (private communication). This suggests that the period value might actually be shorter ( d ). Visually, the primary s amplitude is about 0.3 mag, the secondary s 0.2 mag. Thanks go to T. Kinnunen for his advice concerning the GCVS s 74 th name-list on the web and to T. Markham for providing the data of the BAA-VSS. K. Tikkanen

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