Recent Minima of 161 Eclipsing Binary Stars

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1 Samolyk, JAAVSO Volume 38, Recent Minima of 161 Eclipsing Binary Stars Gerard Samolyk P.O. Box 20677; Greenfield, WI 53220; Received September 23, 2009; accepted September 25, 2009 Abstract This paper continues the publication of times of minima for eclipsing binary stars from observations reported to the AAVSO Eclipsing Binary Section. Times of minima from observations made from March 2009 through August 2009, along with a few unpublished times of minima from older data, are presented. 1. Recent observations The accompanying list contains times of minima calculated from recent CCD observations made by participants in the AAVSO s eclipsing binary program. This list will be web-archived and made available through the AAVSO ftp site at ftp://ftp. aavso.org/public/datasets/jsamoj381.txt. This list, along with eclipsing binary data from earlier AAVSO publications, is also included in the Lichtenknecker database administrated by the Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.v. (BAV) at These observations were reduced by the observers or the writer using the method of Kwee and Van Woerden (1956). The standard error is included when available. The linear elements in the General Catalogue of Variable Stars (GCVS, Kholopov et al. 1985) were used to compute the O C values for most stars. For a few exceptions where the GCVS elements are missing or are in significant error, light elements from another source are used: CD Cam (Baldwin and Samolyk 2007), CW Cas (Samolyk 1992a), DV Cep (Frank and Lichtenknecker 1987), DF Hya (Samolyk 1992b), EF Ori (Baldwin and Samolyk 2005), and GU Ori (Samolyk 1985). O C values listed in this paper can be directly compared with values published in recent numbers of the AAVSO Observed Minima Timings of Eclipsing Binaries series. The number of observations used for determination of each time of minimum is given under N when available. References Baldwin, M. E., and Samolyk, G. 2005, Observed Minima Timings of Eclipsing Binaries No. 10, AAVSO, Cambridge, MA. Baldwin, M. E., and Samolyk, G. 2007, Observed Minima Timings of Eclipsing Binaries No. 12, AAVSO, Cambridge, MA. Frank, P., and Lichtenknecker, D. 1987, BAV Mitt., No. 47. Kholopov, P. N., et al. 1985, General Catalogue of Variable Stars, 4th ed., Moscow.

2 86 Samolyk, JAAVSO Volume 38, 2010 Kwee, K. K., and Van Woerden, H. 1956, Bull. Astron. Inst. Netherlands, 12, 327. Samolyk, G. 1985, J. Amer. Assoc. Var. Star Obs., 14, 12. Samolyk, G. 1992a, J. Amer. Assoc. Var. Star Obs., 21, 34. Samolyk, G. 1992b, J. Amer. Assoc. Var. Star Obs., 21, 111. Table 1. Recent times of minima of stars in the AAVSO eclipsing binary program. RT And CCD SAH UU And CCD SAH WZ And CCD OYE AB And CCD MZK BD And CCD SAH BX And CCD SAH OO Aql CCD SAH OO Aql CCD MZK V346 Aql CCD SAH V417 Aql CCD OYE WW Aur CCD SAH HL Aur CCD OYE TU Boo CCD SAH TY Boo CCD SAH TY Boo CCD PRX TY Boo CCD OYE TY Boo CCD OYE TY Boo CCD OYE TY Boo CCD SAH TZ Boo CCD SAH TZ Boo CCD SAH TZ Boo CCD OYE VW Boo CCD MZK VW Boo CCD SAH VW Boo CCD PRX VW Boo CCD SAH VW Boo CCD OYE AC Boo CCD OYE AD Boo CCD SAH EF Boo CCD OYE SV Cam CCD SAH AL Cam CCD SAH AN Cam CCD SAH CD Cam CCD SAH

3 Samolyk, JAAVSO Volume 38, UU CMa CCD SAH RW CMi CCD CLZ TX CMi CCD CLZ TY Cap CCD SAH TV Cas CCD SAH AB Cas CCD OYE CW Cas CCD SAH CW Cas CCD SAH DZ Cas CCD SAH IR Cas CCD SAH IR Cas CCD SAH PV Cas CCD MZK V364 Cas CCD SAH V375 Cas CCD MZK V375 Cas CCD SAH U Cep CCD SAH SU Cep CCD SAH WZ Cep CCD SAH DK Cep CCD SAH DK Cep CCD SAH DV Cep CCD SAH EG Cep CCD SAH EG Cep CCD SAH EK Cep CCD SAH IO Cep CCD OYE RW Com CCD SAH RW Com CCD PRX RW Com CCD SAH RW Com CCD OYE RZ Com CCD SAH SS Com CCD SAH SS Com CCD PRX CC Com CCD MZK CC Com CCD SAH CC Com CCD SAH CC Com CCD PRX U CrB CCD SAH RW CrB CCD MZK RW CrB CCD SAH

4 88 Samolyk, JAAVSO Volume 38, 2010 TW CrB CCD VJA W Crv CCD SAH W Crv CCD HES W Crv CCD PRX RV Crv CCD SAH RV Crv CCD SAH V Crt CCD SAH SW Cyg CCD SAH WW Cyg CCD SAH ZZ Cyg CCD MZK ZZ Cyg CCD SAH AE Cyg CCD SAH AE Cyg CCD MZK BR Cyg CCD SAH CG Cyg CCD MZK DK Cyg CCD SAH DK Cyg CCD SAH KR Cyg CCD SAH KV Cyg CCD MZK KV Cyg CCD SAH V346 Cyg CCD SAH V387 Cyg CCD SAH V388 Cyg CCD MZK V388 Cyg CCD OYE V456 Cyg CCD MZK V466 Cyg CCD SAH V466 Cyg CCD MZK V477 Cyg CCD SAH V477 Cyg CCD MZK V499 Cyg CCD OYE V548 Cyg CCD SAH V704 Cyg CCD SAH V704 Cyg CCD MZK V841 Cyg CCD DKS V841 Cyg CCD OYE V1034 Cyg CCD SAH V1034 Cyg CCD MZK W Del CCD SAH TY Del CCD SAH

5 Samolyk, JAAVSO Volume 38, TY Del CCD MZK YY Del CCD SAH FZ Del CCD SAH RZ Dra CCD SAH TW Dra CCD SAH TW Dra CCD SAH UZ Dra CCD SAH AR Dra CCD DKS AR Dra CCD OYE CM Dra CCD OYE QW Gem CCD SFV Z Her CCD SAH SZ Her CCD VJA SZ Her CCD SAH SZ Her CCD SAH TT Her CCD MZK TT Her CCD SAH TU Her CCD SAH TU Her CCD MZK UX Her CCD SAH CC Her CCD SAH CC Her CCD MZK CT Her CCD SAH LT Her CCD MZK WY Hya CCD SAH WY Hya CCD SAH DF Hya CCD SAH DF Hya CCD SAH SW Lac CCD SAH CM Lac CCD SAH CM Lac CCD MZK Y Leo CCD GHS Y Leo CCD PRX UV Leo CCD SAH WZ Leo CCD SAH XY Leo CCD CLZ AP Leo CCD CK AP Leo CCD CK AP Leo CCD DKS

6 90 Samolyk, JAAVSO Volume 38, 2010 AP Leo CCD OYE CE Leo CCD OYE RT LMi CCD DKS RT LMi CCD DKS RT LMi CCD DKS RT LMi CCD DKS RT LMi CCD DKS RT LMi CCD OYE SS Lib CCD SAH RY Lyn CCD SAH UZ Lyr CCD HES EW Lyr CCD HES EW Lyr CCD SAH EW Lyr CCD MZK FL Lyr CCD MZK FL Lyr CCD SAH AT Mon CCD SAH EP Mon CCD GHS V508 Oph CCD SAH V508 Oph CCD OYE V508 Oph CCD OYE V508 Oph CCD SAH V839 Oph CCD SAH V1010 Oph CCD SAH EF Ori CCD CLZ FL Ori CCD SAH FL Ori CCD GHS FZ Ori CCD GHS FZ Ori CCD SAH GU Ori CCD SAH U Peg CCD OYE U Peg CCD OYE U Peg CCD OYE BB Peg CCD MZK BB Peg CCD SAH GP Peg CCD SAH IK Per CCD OYE IU Per CCD SAH AV Pup CCD PRX

7 Samolyk, JAAVSO Volume 38, U Sge CCD SAH U Sge CCD SAH V505 Sgr CCD SAH V1968 Sgr CCD SAH AO Ser CCD SAH AO Ser CCD HES AU Ser CCD BAMA AU Ser CCD DKS AU Ser CCD OYE CC Ser CCD SAH CC Ser CCD SAH TY Tau CCD SAH WY Tau CCD HES WY Tau CCD SAH X Tri CCD SAH W UMa CCD MZK TY UMa CCD MZK TY UMa CCD PRX TY UMa CCD SAH UX UMa CCD SAH UX UMa CCD SAH UX UMa CCD SAH UX UMa CCD OYE UX UMa CCD OYE UX UMa CCD OYE VV UMa CCD OYE VV UMa CCD PRX VV UMa CCD OYE VV UMa CCD SAH XZ UMa CCD SAH ZZ UMa CCD MZK AF UMa CCD SAH BM UMa CCD CLZ BM UMa CCD OYE BM UMa CCD OYE KM UMa CCD OYE KM UMa CCD OYE W UMi CCD SAH RU UMi CCD HES Table 1 continued on following page

8 92 Samolyk, JAAVSO Volume 38, 2010 RU UMi CCD PRX RU UMi CCD PRX VV Vir CCD SAH AG Vir CCD MZK AG Vir CCD MZK AH Vir CCD SAH AH Vir CCD SAH AH Vir CCD SAH AK Vir CCD SAH AW Vir CCD SAH AW Vir CCD PRX AW Vir CCD MZK AW Vir CCD MZK AW Vir CCD OYE AZ Vir CCD SAH AZ Vir CCD MZK AZ Vir CCD PRX AZ Vir CCD MZK BH Vir CCD MZK BH Vir CCD PRX Z Vul CCD SAH AW Vul CCD SAH AX Vul CCD SAH AY Vul CCD SAH BE Vul CCD SAH BO Vul CCD SAH BS Vul CCD SAH BT Vul CCD SAH BT Vul CCD OYE BT Vul CCD MZK BU Vul CCD SAH CD Vul CCD SAH CD Vul CCD MZK GR Vul CCD OYE HS Vul CCD OYE *Observers: BAMA, L. Baldinelli and A. Maitan; CK, S. Cook; CLZ, L. Corp; DKS, S. Dvorak; GHS, H. Gerner; HES, C. Hesseltine; MZK, K. Menzies; OYE, Y. Ogmen; PRX, R. Poklar; SAH, G. Samolyk; SFV, F. Salvaggio; VJA, J. Virtanen.