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J/AJ/121/870 BVI photometry of Variables in M33 (Macri+, 2001)
DIRECT distances to nearby galaxies using detached eclipsing binaries and Cepheids. VI. Variables in the central part of M33. Macri L.M., Stanek K.Z., Sasselov D.D., Krockenberger M., Kaluzny J. <Astron. J. 121, 870 (2001)> =2001AJ....121..870M
ADC_Keywords: Stars, variable ; Photometry, UBVRI Keywords: binaries: eclipsing - Cepheids - distance scale - galaxies: individual (M33) - stars: variables: other Abstract: The DIRECT project aims to determine direct distances to two important galaxies in the cosmological distance ladder - M31 and M33 - using detached eclipsing binaries (DEBs) and Cepheids. We present the results of the first large-scale CCD-based search for variables in M33. We have observed two fields located in the central region of M33 for a total of 95 nights on the F. L. Whipple Observatory 1.2 m telescope and 36 nights on the Michigan-Dartmouth-MIT 1.3 m telescope. We have found a total of 544 variables, including 251 Cepheids and 47 eclipsing binaries. The catalog of variables is available on-line, along with finding charts and BVI light curve data (consisting of 8.2x104 individual measurements). The complete set of CCD frames is available upon request. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 251 DIRECT Cepheids table2.dat 108 47 DIRECT Eclipsing Binaries table3.dat 85 62 DIRECT Periodic Variables table4.dat 85 184 DIRECT Miscellaneous Variables table5.dat 50 38891 Photometric data - Cepheid Variables table6.dat 50 7309 Photometric data - Eclipsing Binaries table7.dat 50 5744 Photometric data - Periodic Variables table8.dat 50 29998 Photometric data - Miscellaneous Variables table9.dat 72 98 List of M33 classical variables (discovered between 1922 and 1983) and their DIRECT counterparts table10.dat 70 68 List of variables from Kinman, Mould, & Wood (1987AJ.....93..833K) with DIRECT counterparts
See also: http://cfa-www.harvard.edu/~kstanek/DIRECT/ : DIRECT Project homepage J/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001) J/AJ/121/2032 : Direct variables in M33A field (Mochejska+, 2001) J/A+A/366/498 : HST VI photometry of M33 star clusters (Chandar+, 2001) J/AJ/110/1649 : HST VI photometry near the M33 nucleus (Mighell+ 1995) J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995) J/ApJS/99/551 : BVI photometry of massive stars in M33 and M31 (Hunter+ 1995) J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 21 A21 --- D33 DIRECT Cepheid designation (G1) 23- 24 I2 h RAh Right Ascension (J2000) 26- 27 I2 min RAm Right Ascension (J2000) 29- 33 F5.2 s RAs Right Ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 45 F5.2 arcsec DEs Declination (J2000) 47- 51 F5.2 d Per Period 53- 57 F5.2 mag Vmag Mean Johnson V band magnitude from template fit 59- 63 F5.2 mag Imag ? Mean Cousins I band magnitude from template fit 65- 69 F5.2 mag Bmag ? Mean Johnson B band magnitude from template fit 71- 74 F4.2 mag e_Vmag rms deviation of Vmag 76- 79 F4.2 mag e_Imag ? rms deviation of Imag 81- 84 F4.2 mag e_Bmag ? rms deviation of Bmag 86- 89 F4.2 mag Amp Amplitude of pulsation
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 21 A21 --- D33 DIRECT Eclipsing Binary designation (G1) 23- 24 I2 h RAh Right Ascension (J2000) 26- 27 I2 min RAm Right Ascension (J2000) 29- 33 F5.2 s RAs Right Ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 45 F5.2 arcsec DEs Declination (J2000) 47- 53 F7.4 d Per Period 55- 59 F5.2 mag Vmag Mean Johnson V band magnitude 61- 65 F5.2 mag Imag ? Mean Cousins I band magnitude 67- 71 F5.2 mag Bmag ? mean Johnson B band magnitude 73- 76 F4.2 mag e_Vmag rms deviation of Vmag from template fit 78- 81 F4.2 mag e_Imag ? rms deviation of Imag from template fit 83- 86 F4.2 mag e_Bmag ? rms deviation of Bmag from template fit 88- 91 F4.2 --- RadP Radius of primary star relative to the binary separation 93- 96 F4.2 --- RadS Radius of secondary star relative to the binary separation 98-102 F5.2 deg Incl Inclination of the orbit 104-107 F4.2 --- Eccen Eccentricity of the orbit
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 21 A21 --- D33 DIRECT periodic variable designation (G1) 23- 24 I2 h RAh Right Ascension (J2000) 26- 27 I2 min RAm Right Ascension (J2000) 29- 33 F5.2 s RAs Right Ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 45 F5.2 arcsec DEs Declination (J2000) 47- 51 F5.1 d Per Period 53- 57 F5.2 mag Vmag ? Mean Johnson V band magnitude 59- 63 F5.2 mag Imag ? Mean Cousins I band magnitude 65- 69 F5.2 mag Bmag ? Mean Johnson B band magnitude 71- 74 F4.2 mag e_Vmag ? rms deviation of Vmag from template fit 76- 79 F4.2 mag e_Imag ? rms deviation of Imag from template fit 81- 84 F4.2 mag e_Bmag ? rms deviation of Bmag from template fit
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 21 A21 --- D33 DIRECT miscellaneous variable designation (G1) 23- 24 I2 h RAh Right Ascension (J2000) 26- 27 I2 min RAm Right Ascension (J2000) 29- 33 F5.2 s RAs Right Ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 45 F5.2 arcsec DEs Declination (J2000) 47- 51 F5.2 --- JS V-band J_S_ variability index (1) 53- 57 F5.2 mag Vmag Mean Johnson V band magnitude 59- 63 F5.2 mag Imag ? Mean Cousins I band magnitude 65- 69 F5.2 mag Bmag ? Mean Johnson B band magnitude 71- 74 F4.2 mag e_Vmag rms deviation of Vmag from template fit 76- 79 F4.2 mag e_Imag ? rms deviation of Imag from template fit 81- 84 F4.2 mag e_Bmag ? rms deviation of Bmag from template fit
Note (1): Objects with JS≥0.75 and e_Vmag≥0.04mag are considered as candidate variables. See Stetson, 1996PASP..108..851S for more details.
Byte-by-byte Description of file: table5.dat table6.dat table7.dat table8.dat
Bytes Format Units Label Explanations
1- 21 A21 --- D33 DIRECT variable designation (G1) 23 A1 --- Filt [BVI] Filter used (Johnson BV, Cousins I) 25- 36 F12.4 d HJD Julian date 38- 43 F6.3 mag mag Magnitude of Filt 45- 49 F5.3 mag e_mag Uncertainty in mag
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Classical designation (1) 10- 30 A21 --- D33 DIRECT designation (G1) (2) 32- 33 I2 h RAh Right ascension (J2000.0) 35- 36 I2 min RAm Right ascension (J2000.0) 38- 41 F4.1 s RAs Right ascension (J2000.0) 43 A1 --- DE- Declination sign (J2000.0) 44- 45 I2 deg DEd Declination (J2000.0) 47- 48 I2 arcmin DEm Declination (J2000.0) 50- 51 I2 arcsec DEs Declination (J2000.0) 53 A1 --- TypeCl Classical variable type (3) 55 A1 --- TypeD DIRECT variable type (3) 57- 61 F5.2 d PerCl ? Classical period 63- 68 F6.3 d PerD ? DIRECT period 70- 72 A3 --- Note Notes (4)
Note (1): References. Du22: Duncan (1922PASP...34..290D) Hu26: Hubble (1926ApJ....63..236H) HS53: Hubble & Sandage (1953ApJ...118..353H) VHK75: van den Bergh, Herbst & Kowal (1975ApJS...29..303V) SC83: Sandage & Carlson (1983ApJ...267L..25S) Note (2): blank: object outside the boundaries of the catalog of Macri et al. (2001, Cat. <J/AJ/121/861), coordinates obtained from the literature or the digitized POSS plate of M33. Note (3): Key to types: C: Cepheid E: Eclipsing binary P: periodic variable V: miscellaneous variable N: does not display variability in the DIRECT database Note (4): Notes: 1: possibly misidentified with nearby star in original finding chart 3: saturated in DIRECT images 4: same object as Hu26-V04 5: very faint, below detection threshold in DIRECT images 6: very faint, below detection threshold in DIRECT images 7: possibly misidentified with nearby star in original finding chart 8: same object as Hu26-V30.
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1 I1 --- Class Object classification (1) 3- 8 A6 --- KMW KMW (Kinman et al., 1987AJ.....93..833K) designation (2) 10- 30 A21 --- D33 DIRECT designation (G1) 32- 33 I2 h RAh Right ascension (J2000.0) 35- 36 I2 min RAm Right ascension (J2000.0) 38- 41 F4.1 s RAs Right ascension (J2000.0) 43 A1 --- DE- Declination sign (J2000.0) 44- 45 I2 deg DEd Declination (J2000.0) 47- 48 I2 arcmin DEm Declination (J2000.0) 50- 53 F4.1 arcsec DEs Declination (J2000.0) 55 A1 --- TypeD DIRECT variable type (3) 57- 62 F6.2 d PerKMW ? KMW period 64- 68 F5.2 d PerD ? DIRECT period 70 I1 --- Note ? [1/2] Notes (4)
Note (1): Classification: 3: Objects classified as Cepheids or periodic (Tables 1 and 3) 2: Objects classified as long-period variables (Table 2) 5: Unclassified variables (Table 4) Note (2): blank: object outside the boundaries of the catalog of Macri et al. (2001, Cat. <J/AJ/121/861), coordinates obtained from the literature or the digitized POSS plate of M33. Note (3): Key to types: C: Cepheid P: periodic variable V: miscellaneous variable *: nonvariable star present in the catalog of Macri et al. (2001, Cat. J/AJ/121/861, at this position Note (4): Notes: 1: very faint, below detection threshold in DIRECT images 2: classified by Kinman et al. (1987AJ.....93..833W) as a W Vir candidate
Global notes: Note (G1): D33 JHHMMSS.s+DDMMSS.s in Simbad
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2001
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