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II/162    CCD search for Cepheids in Crux and Centaurus     (Caldwell+, 1991)

A scanner CCD search for Cepheids and other variables in Crux and Centaurus. Caldwell J.A.R., Keane M.J., Schechter P.L. <Astron. J., 101, 1763 (1991)> =1991AJ....101.1763C
ADC_Keywords: Stars, variable; Photometry Abstract: This catalog contains the results of a photometric survey for variable stars in a 9.4 square degree region along the galactic plane in Crux and Centaurus. A total of 300308 stars were observed at seven epochs over 42 days; 224 524 of these stars were detected at multiple epochs and were tested for possible variations in brightness that exceed observational error. 2422 stars are identified as variable at a formal confidence level of 99%; 270 of the new variables brighter than I=14.0 are classified as long period variables. A list of 242 likely short period variables with RMS amplitudes ≥0.060mag is given. From this list, 37 Cepheid candidates were selected after inspection of their light curves. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file data1.dat 79 19124 The complete list of probable variables data2.dat 79 225052 Observations with RA = 11:39:40 to 12:15:41 and declination = -63:05:12 to -62:46:46 (1950) data3.dat 79 207787 Observations with RA = 11:39:40 to 12:15:12 and declination = -62:46:47 to -62:27:26 (1950) data4.dat 79 254005 Observations with RA = 11:39:40 to 12:14:44 and declination = -62:27:27 to -62:03:11 (1950) data5.dat 79 175070 Observations with RA = 11:39:40 to 12:14:16 and declination = -62:03:12 to -61:47:46 (1950) data6.dat 79 187418 Observations with RA = 11:39:39 to 12:13:48 and declination = -61:47:47 to -61:24:46 (1950) data7.dat 79 224071 Observations with RA = 13:10:14 to 13:46:17 and declination = -63:06:09 to -62:54:03 (1950) data8.dat 79 182283 Observations with RA = 13:10:15 to 13:45:52 and declination = -62:53:19 to -62:36:32 (1950) data9.dat 79 80086 Observations with RA = 13:10:15 to 13:45:28 and declination = -62:35:49 to -62:23:27 (1950) table4.dat 69 242 High amplitude, short-period variables found in this survey table5.dat 68 270 Long-period variables found in this survey table6.dat 64 127 Variable stars identified with IRAS 12 µm sources table7.dat 54 18 *The ABCS carbon stars detected as variables in this survey
Note on table7.dat: ABCS: Aaronsom M. et al., 1989ApJS...70..637A
Byte-by-byte Description of file: data*.dat
Bytes Format Units Label Explanations
1- 4 I4 --- image Image number 5- 8 I4 --- no Observed object within the image 10- 11 I2 h RAh Right Ascension, hours (1950) 13- 14 I2 min RAm Right Ascension, minutes (1950) 16- 20 F5.2 s RAs Right Ascension, seconds (1950) 22 A1 --- DE- Declination sign 23- 24 I2 deg DEd Declination, degrees (1950) 26- 27 I2 arcmin DEm Declination, minutes (1950) 29- 32 F4.1 arcsec DEs Declination, seconds (1950) 34- 39 F6.3 mag Icmag Cousins I magnitude 41- 45 F5.3 mag e_Icmag *Formal uncertainty in I 47- 55 F9.4 d JD-2440000 Modified Julian Date 57- 62 F6.2 pix x *X position within the image 64- 70 F7.2 pix y *Y position within the image 72 I1 --- class *Object classification 74- 79 I6 --- ID *Unique identifier un source catalog
Note on e_Icmag: Stars with centroids within 12 pixels of the beginning of the image (which, unfortunately, includes the first stars on the variable star list) may have suffered from a software bug in the data acquisition and may have errors bigger than the formal errors. Note on x and y: The pixels are not square. They are 0.45" in the x direction and either 3.7" or 1.85" in the y direction. The latter are less frequent and go somewhat fainter than the lower resolution observations. Note on class: 1 = single star 2 = galaxy 3 = one component of a multiple star 4 = an object for which the classification is uncertain 5 = too few pixels to determine classification or for which a position was derived beyond the boundaries of the image or fit subraster 6 = should not be in the catalog 7 = too faint to attempt classification 8 = could not be modeled (too bright or cosmic ray) and has been excised Note on ID: This is a sequence number assigned for internal use, the first digit being assigned according to the datafile number.
Byte-by-byte Description of file: table4.dat, table5.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Variable name 11 A1 --- m_Name Multiplicity index on Name 13- 14 I2 h RAh Right ascension 1950 16- 17 I2 min RAm Right ascension 1950 19- 23 F5.2 s RAs Right ascension 1950 25 A1 --- DE- Declination sign 26- 27 I2 deg DEd Declination 1950 29- 30 I2 arcmin DEm Declination 1950 32- 35 F4.1 arcsec DEs Declination 1950 37- 41 F5.2 mag Imag I (Cousins) magnitude 43- 47 F5.3 mag e_Imag ? rms uncertainty on Imag 49- 68 A20 --- Notes Notes (1)
Note (1): 1. 1st rank Cepheid candidate. 2. 2nd rank Cepheid candidate. 3. Possible eclipse. 4. Possible LPV. 5. Additional photometry obtained 1990 Feb-Apr. 6. Variable is also identified as an IRAS 12µ source, see Table 6 7. Variable is also identified as a carbon star, see Table 7 Note: the remarks in table 5 are in bytes 49-61.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Variable name 13- 14 I2 h RAh Right ascension 1950 16- 17 I2 min RAm Right ascension 1950 19- 23 F5.2 s RAs Right ascension 1950 25 A1 --- DE- Declination sign 26- 27 I2 deg DEd Declination 1950 29- 30 I2 arcmin DEm Declination 1950 32- 35 F4.1 arcsec DEs Declination 1950 37- 41 F5.2 mag Imag I (Cousins) magnitude 43- 52 A10 --- IRAS IRAS source name 54- 64 A11 --- Notes Notes (1)
Note (1): 1. Variable was classified as LPV and is also listed in Table 5. 2. Variable was classified as short-period variable and is also listed in Table 4. Likely a long period variable observed near minimum or maximum light. 3. Object is also identified as a carbon star, see Table 7
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 5 A5 --- ABCS Aaronsom C stars (1) 7- 16 A10 --- Name Variable star name 18- 19 I2 h RAh Right ascension 1950 21- 22 I2 min RAm Right ascension 1950 24- 28 F5.2 s RAs Right ascension 1950 30 A1 --- DE- Declination sign 31- 32 I2 deg DEd Declination 1950 34- 35 I2 arcmin DEm Declination 1950 37- 40 F4.1 arcsec DEs Declination 1950 42- 54 A13 --- Notes Notes (2)
Note (1): Aaronsom M. et al., 1989ApJS...70..637A Note (2): 1. Classified as a LPV, see Table 5. 2. Also identified with an IRAS 12µ source, see Table 6.
Historical note: The tables were keypunched at CDS; the data files were provided by Dr. P. L. Schechter. The portion of this document which refers to the tables and the Description were prepared by Simona Mei and Patricia Bauer of the CDS in December 1994.
(End) Nancy Grace Roman [SSDOO/ADC] 30-Apr-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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