J/A+AS/130/245 Light curves of the PMS system TY CrA (Vaz+ 1998) ================================================================================ Four-colour photometry of eclipsing binaries. XXXIX. Light curves of the pre-main sequence triple system TY Coronae Australis Vaz L.P.R., Andersen J., Casey B.W., Clausen J.V., Mathieu R.D., Heyer I. =1998A&AS..130..245V (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Binaries, eclipsing ; Photometry, uvby Keywords: binaries: eclipsing - stars: individual: TY CrA - stars: pre-main sequence Description: Complete uvby light curves of the detached Herbig Be eclipsing binary TY Coronae Australis are presented. A total of 1787 photometric measurements in each of the four colours were obtained in 1989 and in 1992-1994. A detailed analysis of the y light curve obtained in 1992-1993 is published separately (Casey et al. 1997). The reflection nebula around the system contributes about 30% of the light in all four passbands. Here we present and discuss the non-eclipse-related photometric variability of the system. We suggest that these variations are the result of variable obscuration, possibly linked to dust shells physically associated to the system. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 01 40.7 -36 52 33 TY CrA 19 01 50.3 -36 39 52 HD 176423 ---------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 62 1788 Magnitude differences TY CrA - HD 176423 in 1989, 1992, 1993 and 1994 (instrumental system) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 yr Year Year of observations 6- 18 F13.5 d HJD Heliocentric Julian Day 20- 24 F5.3 mag Dymag y magnitude difference 26- 30 F5.3 mag Db-y b-y colour index difference 32- 37 F6.3 mag Dm1 m1 Stroemgren index difference 39- 44 F6.3 mag Dc1 c1 Stroemgren index difference 46- 50 F5.3 mag Dbmag b magnitude difference 52- 56 F5.3 mag Dvmag v magnitude difference 58- 62 F5.3 mag Dumag u magnitude difference -------------------------------------------------------------------------------- Acknowledgements: Luiz Paulo R. Vaz References: Gylenkerne et al., Paper I. 1975A&A....42..303G Jorgensen & Gylenkerne, Paper II. (RZ Cha) 1975A&A....44..343J Clausen et al., Paper IIIa. (zeta Phe) 1976A&AS...23..261C Clausen et al., Paper IIIb. (zeta Phe) 1976A&A....46..205C Clausen & Gronbech, Paper IV. (UX Men) 1976A&A....48...49C Gronbech, Paper V. (NO Pup) 1976A&A....50...79G Clausen et al., Paper VI. (V1647 Sgr) 1977A&A....58..121C Gronbech et al., Paper VII. (SZ Cen) 1977A&A....55..401G Clausen & Gronbech, Paper VIII. (CV Vel) 1977A&A....58..131C Jorgensen & Gronbech. Paper IXa. (AI Hya) 1978A&AS...33..103J Jorgensen & Gronbech. Paper IXb. (AI Hya) 1978A&A....66..377J Clausen & Nordstrom, Paper Xa. (chi2 Hya) 1978A&A....67...15C Clausen & Nordstrom, Paper Xb. (chi2 Hya) 1978A&AS...31..307C Clausen & Nordstrom, Paper XIa. (RS CHa) 1980A&A....83..339C Clausen & Nordstrom, Paper XIb. (RS Cha) 1978A&AS...33...87C Jorgensen, Paper XIIb. (TV Cet) 1979A&A....72..356J Andersen et al., Paper XIII. (TY Pyx) 1981A&A...101....7A Andersen et al., Paper XIIIb. (TY Pyx) 1981A&AS...43..141A Andersen & Clausen, Paper XIVb. (QX Car) 1982A&AS...49..571A Clausen et al., Paper XVb. (V Pup) 1983A&AS...52..323C Clausen & Nordstrom, Paper XVI. (VV Pyx) 1983A&AS...54..149C Andersen et al., Paper XVII. (DM Vir) 1983A&AS...54..161A Reipurth et al., Paper XVIII. (PV Pup) 1983A&AS...54..301R Vaz et al., Paper XIX. (KM Hyd) 1983A&AS...54..475V Andersen et al., Paper XX. (V760 Sco) 1985A&AS...61..353A Gimenez et al., Paper XXIa. (V346 Cen) 1986A&A...160..310G Gimenez et al., Paper XXIb. (V346 Cen) 1986A&AS...66...45G Gimenez & Clausen, Paper XXIIa. (GL Car) 1986A&A...161..275G Gimenez et al., Paper XXIIb. (GJ Car) 1985A&AS...62..179G Andersen et al., Paper XXIII. (GZ CMa) 1985A&AS...59..349A Gimenez et al., Paper XXIV. (QX Car, xi Phe, NO Pup) 1986A&A...159..157G Clausen et al., Paper XXV. (V451 Oph) 1987A&AS...68..141C Helt, Paper XXVIa. (RY Aqr) 1987A&A...172..155H Helt, Paper XXVIb. (RY Aqr) 1987A&AS...68..187H Gronbech, Paper XXVIIa. (AO Vel) 1987A&AS...68..317G Clausen et al., Paper XXVIIb. (AO Vel) 1995, Cat. Gronbech et al., Paper XXVIII. (BW Aqu) 1987A&AS...68..323G Gronbech et al., Paper XXIX. (TZ Men) 1987A&AS...68..331G Vaz et al., Paper XXXa. (LZ Cen) 1995, Cat. Vaz et al., Paper XXXb. (LZ Cen) 1995A&A...301..693V Clausen et al., Paper XXXI. (EM Car) 1989A&AS...77..257C Clausen et al., Paper XXXII. (V1031 Ori) 1989A&AS...81..197C Clausen et al., Paper XXXIII. (TZ For) 1991A&AS...88..535C Gimenez et al., Paper XXXIV. (CW Cep) 1990A&AS...86..259G Clausen et al., Paper XXXV. (GG Lup) 1993, Cat. Vaz et al., Paper XXXVI (V3903 Sgr) 1998, Cat. Clausen et al., Paper XXXVII. (V539 Ara) 1996, Cat. Vaz et al., Paper XXXVIII (V906 Sco) 1997, Cat. Casey B.W., Mathieu R.D., Vaz L.P.R., Andersen J., Suntzeff N.B., 1998, AJ, in press ================================================================================ (End) Patricia Bauer [CDS] 08-Dec-1997