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J/AJ/110/1141 Variables in the Sagittarius dSph (Mateo+ 1995)
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The optical gravitational lensing experiment: variable stars
in the Sagittarius dwarf spheroidal galaxy
Mateo M., Kubiak M., Szymanski M., Kaluzny J., Krzeminski W., Udalski A.
<Astron. J. 110, 1141 (1995)>
=1995AJ....110.1141M
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ADC_Keywords: Gravitational lensing ; Photometry, CCD ; Stars, variable
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>~10Gyr) population.
Objects:
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RA (2000) DE Designation(s)
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19 06 11 -30 25 22 Sgr field
18 33 26 -40 57 57 Control field
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
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
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Byte-by-byte Description of file: table5a.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 --- HJD Heliocentric Julian Date
13- 19 F7.3 mag VmagV1 []? Sgr V1 calibrated V magnitude
21- 25 F5.3 mag e_VmagV1 []? VmagV1 error
27- 31 F5.3 --- PhasV1 [0/1[? Sgr V1 phase
33- 39 F7.3 mag VmagV2 []? Sgr V2 calibrated V magnitude
41- 45 F5.3 mag e_VmagV2 []? VmagV2 error
47- 51 F5.3 --- PhasV2 [0/1[? Sgr V2 phase
53- 59 F7.3 mag VmagV3 []? Sgr V3 calibrated V magnitude
61- 65 F5.3 mag e_VmagV3 []? VmagV3 error
67- 71 F5.3 --- PhasV3 [0/1[? Sgr V3 phase
73- 79 F7.3 mag VmagV4 []? Sgr V4 calibrated V magnitude
81- 85 F5.3 mag e_VmagV4 []? VmagV4 error
87- 91 F5.3 --- PhasV4 [0/1[? Sgr V4 phase
93- 99 F7.3 mag VmagV5 []? Sgr V5 calibrated V magnitude
101-105 F5.3 mag e_VmagV5 []? VmagV5 error
107-111 F5.3 --- PhasV5 [0/1[? Sgr V5 phase
113-119 F7.3 mag VmagV6 []? Sgr V6 calibrated V magnitude
121-125 F5.3 mag e_VmagV6 []? VmagV6 error
127-131 F5.3 --- PhasV6 [0/1[? Sgr V6 phase
133-139 F7.3 mag VmagV7 []? Sgr V7 calibrated V magnitude
141-145 F5.3 mag e_VmagV7 []? VmagV7 error
147-151 F5.3 --- PhasV7 [0/1[? Sgr V7 phase
153-159 F7.3 mag VmagV8 []? Sgr V8 calibrated V magnitude
161-165 F5.3 mag e_VmagV8 []? VmagV8 error
167-171 F5.3 --- PhasV8 [0/1[? Sgr V8 phase
173-179 F7.3 mag VmagV9 []? Sgr V9 calibrated V magnitude
181-185 F5.3 mag e_VmagV9 []? VmagV9 error
187-191 F5.3 --- PhasV9 [0/1[? Sgr V9 phase
193-199 F7.3 mag VmagV10 []? Sgr V10 calibrated V magnitude
201-205 F5.3 mag e_VmagV10 []? VmagV10 error
207-211 F5.3 --- PhasV10 [0/1[? Sgr V10 phase
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Byte-by-byte Description of file: table5b.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 --- HJD Heliocentric Julian Date
13- 19 F7.3 mag VmagV1c []? Control V1 calibrated V magnitude
21- 25 F5.3 mag e_VmagV1c []? VmagV1c error
27- 31 F5.3 --- PhasV1c [0/1[? Control V1 phase
33- 39 F7.3 mag VmagV2c []? Control V2 calibrated V magnitude
41- 45 F5.3 mag e_VmagV2c []? VmagV2c error
47- 51 F5.3 --- PhasV2c [0/1[? Control V2 phase
53- 59 F7.3 mag VmagV3c []? Control V3 calibrated V magnitude
61- 65 F5.3 mag e_VmagV3c []? VmagV3c error
67- 71 F5.3 --- PhasV3c [0/1[? Control V3 phase
73- 79 F7.3 mag VmagV4c []? Control V4 calibrated V magnitude
81- 85 F5.3 mag e_VmagV4c []? VmagV4c error
87- 91 F5.3 --- PhasV4c [0/1[? Control V4 phase
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Byte-by-byte Description of file: table5c.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 --- HJD Heliocentric Julian Date
13- 19 F7.3 mag ImagV1 []? Sgr V1 calibrated I magnitude
21- 25 F5.3 mag e_ImagV1 []? ImagV1 error
27- 31 F5.3 --- PhasV1 [0/1[? Sgr V1 phase
33- 39 F7.3 mag ImagV2 []? Sgr V2 calibrated I magnitude
41- 45 F5.3 mag e_ImagV2 []? ImagV2 error
47- 51 F5.3 --- PhasV2 [0/1[? Sgr V2 phase
53- 59 F7.3 mag ImagV3 []? Sgr V3 calibrated I magnitude
61- 65 F5.3 mag e_ImagV3 []? ImagV3 error
67- 71 F5.3 --- PhasV3 [0/1[? Sgr V3 phase
73- 79 F7.3 mag ImagV4 []? Sgr V4 calibrated I magnitude
81- 85 F5.3 mag e_ImagV4 []? ImagV4 error
87- 91 F5.3 --- PhasV4 [0/1[? Sgr V4 phase
93- 99 F7.3 mag ImagV5 []? Sgr V5 calibrated I magnitude
101-105 F5.3 mag e_ImagV5 []? ImagV5 error
107-111 F5.3 --- PhasV5 [0/1[? Sgr V5 phase
113-119 F7.3 mag ImagV6 []? Sgr V6 calibrated I magnitude
121-125 F5.3 mag e_ImagV6 []? ImagV6 error
127-131 F5.3 --- PhasV6 [0/1[? Sgr V6 phase
133-139 F7.3 mag ImagV7 []? Sgr V7 calibrated I magnitude
141-145 F5.3 mag e_ImagV7 []? ImagV7 error
147-151 F5.3 --- PhasV7 [0/1[? Sgr V7 phase
153-159 F7.3 mag ImagV8 []? Sgr V8 calibrated I magnitude
161-165 F5.3 mag e_ImagV8 []? ImagV8 error
167-171 F5.3 --- PhasV8 [0/1[? Sgr V8 phase
173-179 F7.3 mag ImagV9 []? Sgr V9 calibrated I magnitude
181-185 F5.3 mag e_ImagV9 []? ImagV9 error
187-191 F5.3 --- PhasV9 [0/1[? Sgr V9 phase
193-199 F7.3 mag ImagV10 []? Sgr V10 calibrated I magnitude
201-205 F5.3 mag e_ImagV10 []? ImagV10 error
207-211 F5.3 --- PhasV10 [0/1[? Sgr V10 phase
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Byte-by-byte Description of file: table5d.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 --- HJD Heliocentric Julian Date
13- 19 F7.3 mag ImagV1c []? Control V1 calibrated I magnitude
21- 25 F5.3 mag e_ImagV1c []? ImagV1c error
27- 31 F5.3 --- PhasV1c [0/1[? Control V1 phase
33- 39 F7.3 mag ImagV2c []? Control V2 calibrated I magnitude
41- 45 F5.3 mag e_ImagV2c []? ImagV2c error
47- 51 F5.3 --- PhasV2c [0/1[? Control V2 phase
53- 59 F7.3 mag ImagV3c []? Control V3 calibrated I magnitude
61- 65 F5.3 mag e_ImagV3c []? ImagV3c error
67- 71 F5.3 --- PhasV3c [0/1[? Control V3 phase
73- 79 F7.3 mag ImagV4c []? Control V4 calibrated I magnitude
81- 85 F5.3 mag e_ImagV4c []? ImagV4c error
87- 91 F5.3 --- PhasV4c [0/1[? Control V4 phase
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Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 30-Oct-1995
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(End) [CDS] 10-Jan-1996