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 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:
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FileName Lrecl Records Explanations
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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 1987AJ.....93..833K) with DIRECT counterparts
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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 JS 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
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Note (1): Objects with JS≥0.75 and e_Vmag≥0.04mag are considered as candidate
variables. See Stetson, 1996PASP..108..851S 1996PASP..108..851S for more details.
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Byte-by-byte Description of file: table5.dat table6.dat table7.dat table8.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): References.
Du22: Duncan (1922PASP...34..290D 1922PASP...34..290D)
Hu26: Hubble (1926ApJ....63..236H 1926ApJ....63..236H)
HS53: Hubble & Sandage (1953ApJ...118..353H 1953ApJ...118..353H)
VHK75: van den Bergh, Herbst & Kowal (1975ApJS...29..303V 1975ApJS...29..303V)
SC83: Sandage & Carlson (1983ApJ...267L..25S 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.
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1 I1 --- Class Object classification (1)
3- 8 A6 --- KMW KMW (Kinman et al., 1987AJ.....93..833K 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)
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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 1987AJ.....93..833W) as a W Vir candidate
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Global notes:
Note (G1): D33 JHHMMSS.s+DDMMSS.s in Simbad
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2001