CDROM/AJ/V110/P1141 Variables in the Sagittarius dSph (Mateo+ 1995) ================================================================================ The Optical Gravitational Lensing Experiment: Variable Stars in the Sagittarius Dwarf Spheroidal Galaxy Mario Mateo, M. Kubiak, M. Szymanski, J. Kaluzny, W. Krzeminski & A. Udalski <1995, AJ, 110, 1141> =1995AJ....110.1141M ================================================================================ Abstract: We present time-series CCD photometry of a field in the newly discovered dwarf spheroidal galaxy in Sagittarius (hereafter Sgr), and of a nearby control field. These data, which consist of VI images obtained during the 1994 OGLE season, were used to identify and study variable stars in both fields. We discovered ten variable stars in the Sgr field, nine of which have light curves and periods consistent with RR Lyr stars or anomalous Cepheids. The control field contains four short-period contact eclipsing binaries, but no pulsating variables. The variables in the Sgr field include a bright RR Lyr star that is almost certainly located in front of Sgr in the galactic bulge, a short-period contact binary located near or within Sgr, and a short-period pulsating star that may either be a foreground halo RR Lyr star or an anomalous Cepheid within Sgr. The seven remaining variables in the Sgr field are RR Lyr stars with very similar mean apparent magnitudes; we conclude that they are members of Sgr. We estimate the total number of RR Lyr stars in Sgr to be 1930 +/- 730 if M(V,Sgr) = -13, or 310 +/- 120 if M(V,Sgr) = -11. The frequency of pulsating variables in Sgr is consistent with earlier conclusions that the galaxy consists of a predominant old (age >~ 10 Gyr) population. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table5a.dat 211 49 V-band data for the Sgr-field variables table5b.dat 91 38 V-band data for the Control-field variables table5c.dat 211 42 I-band data for the Sgr-field variables table5d.dat 91 31 I-band data for the Control-field variables -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5a.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-11 D11.5 --- HJD Heliocentric Julian Date 12-19 F8.3 mag SV1_V []? Sgr V1 calibrated V magnitude 20-25 F6.3 mag e_SV1_V []? SV1_V error 26-31 F6.3 --- SV1_Ph []? Sgr V1 phase 32-39 F8.3 mag SV2_V []? Sgr V2 calibrated V magnitude 40-45 F6.3 mag e_SV2_V []? SV2_V error 46-51 F6.3 --- SV2_Ph []? Sgr V2 phase 52-59 F8.3 mag SV3_V []? Sgr V3 calibrated V magnitude 60-65 F6.3 mag e_SV3_V []? SV3_V error 66-71 F6.3 --- SV3_Ph []? Sgr V3 phase 72-79 F8.3 mag SV4_V []? Sgr V4 calibrated V magnitude 80-85 F6.3 mag e_SV4_V []? SV4_V error 86-91 F6.3 --- SV4_Ph []? Sgr V4 phase 92-99 F8.3 mag SV5_V []? Sgr V5 calibrated V magnitude 100-105 F6.3 mag e_SV5_V []? SV5_V error 106-111 F6.3 --- SV5_Ph []? Sgr V5 phase 112-119 F8.3 mag SV6_V []? Sgr V6 calibrated V magnitude 120-125 F6.3 mag e_SV6_V []? SV6_V error 126-131 F6.3 --- SV6_Ph []? Sgr V6 phase 132-139 F8.3 mag SV7_V []? Sgr V7 calibrated V magnitude 140-145 F6.3 mag e_SV7_V []? SV7_V error 146-151 F6.3 --- SV7_Ph []? Sgr V7 phase 152-159 F8.3 mag SV8_V []? Sgr V8 calibrated V magnitude 160-165 F6.3 mag e_SV8_V []? SV8_V error 166-171 F6.3 --- SV8_Ph []? Sgr V8 phase 172-179 F8.3 mag SV9_V []? Sgr V9 calibrated V magnitude 180-185 F6.3 mag e_SV9_V []? SV9_V error 186-191 F6.3 --- SV9_Ph []? Sgr V9 phase 192-199 F8.3 mag SV10_V []? Sgr V10 calibrated V magnitude 200-205 F6.3 mag e_SV10_V []? SV10_V error 206-211 F6.3 --- SV10_Ph []? Sgr V10 phase -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5b.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-11 D11.5 --- HJD Heliocentric Julian Date 12-19 F8.3 mag CV1_V []? Control V1 calibrated V magnitude 20-25 F6.3 mag e_CV1_V []? CV1_V error 26-31 F6.3 --- CV1_Ph []? Control V1 phase 32-39 F8.3 mag CV2_V []? Control V2 calibrated V magnitude 40-45 F6.3 mag e_CV2_V []? CV2_V error 46-51 F6.3 --- CV2_Ph []? Control V2 phase 52-59 F8.3 mag CV3_V []? Control V3 calibrated V magnitude 60-65 F6.3 mag e_CV3_V []? CV3_V error 66-71 F6.3 --- CV3_Ph []? Control V3 phase 72-79 F8.3 mag CV4_V []? Control V4 calibrated V magnitude 80-85 F6.3 mag e_CV4_V []? CV4_V error 86-91 F6.3 --- CV4_Ph []? Control V4 phase -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5c.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-11 D11.5 --- HJD Heliocentric Julian Date 12-19 F8.3 mag SV1_I []? Sgr V1 calibrated I magnitude 20-25 F6.3 mag e_SV1_I []? SV1_I error 26-31 F6.3 --- SV1_Ph []? Sgr V1 phase 32-39 F8.3 mag SV2_I []? Sgr V2 calibrated I magnitude 40-45 F6.3 mag e_SV2_I []? SV2_I error 46-51 F6.3 --- SV2_Ph []? Sgr V2 phase 52-59 F8.3 mag SV3_I []? Sgr V3 calibrated I magnitude 60-65 F6.3 mag e_SV3_I []? SV3_I error 66-71 F6.3 --- SV3_Ph []? Sgr V3 phase 72-79 F8.3 mag SV4_I []? Sgr V4 calibrated I magnitude 80-85 F6.3 mag e_SV4_I []? SV4_I error 86-91 F6.3 --- SV4_Ph []? Sgr V4 phase 92-99 F8.3 mag SV5_I []? Sgr V5 calibrated I magnitude 100-105 F6.3 mag e_SV5_I []? SV5_I error 106-111 F6.3 --- SV5_Ph []? Sgr V5 phase 112-119 F8.3 mag SV6_I []? Sgr V6 calibrated I magnitude 120-125 F6.3 mag e_SV6_I []? SV6_I error 126-131 F6.3 --- SV6_Ph []? Sgr V6 phase 132-139 F8.3 mag SV7_I []? Sgr V7 calibrated I magnitude 140-145 F6.3 mag e_SV7_I []? SV7_I error 146-151 F6.3 --- SV7_Ph []? Sgr V7 phase 152-159 F8.3 mag SV8_I []? Sgr V8 calibrated I magnitude 160-165 F6.3 mag e_SV8_I []? SV8_I error 166-171 F6.3 --- SV8_Ph []? Sgr V8 phase 172-179 F8.3 mag SV9_I []? Sgr V9 calibrated I magnitude 180-185 F6.3 mag e_SV9_I []? SV9_I error 186-191 F6.3 --- SV9_Ph []? Sgr V9 phase 192-199 F8.3 mag SV10_I []? Sgr V10 calibrated I magnitude 200-205 F6.3 mag e_SV10_I []? SV10_I error 206-211 F6.3 --- SV10_Ph []? Sgr V10 phase -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5b.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-11 D11.5 --- HJD Heliocentric Julian Date 12-19 F8.3 mag CV1_I []? Control V1 calibrated I magnitude 20-25 F6.3 mag e_CV1_I []? CV1_I error 26-31 F6.3 --- CV1_Ph []? Control V1 phase 32-39 F8.3 mag CV2_I []? Control V2 calibrated I magnitude 40-45 F6.3 mag e_CV2_I []? CV2_I error 46-51 F6.3 --- CV2_Ph []? Control V2 phase 52-59 F8.3 mag CV3_I []? Control V3 calibrated I magnitude 60-65 F6.3 mag e_CV3_I []? CV3_I error 66-71 F6.3 --- CV3_Ph []? Control V3 phase 72-79 F8.3 mag CV4_I []? Control V4 calibrated I magnitude 80-85 F6.3 mag e_CV4_I []? CV4_I error 86-91 F6.3 --- CV4_Ph []? Control V4 phase -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 30-Oct-1995