J/MNRAS/371/1405 Variables in M33 (Hartman+, 2006)
Deep Canada-France-Hawaii Telescope photometric survey of the entire
M33 galaxy - I. Catalogue of 36000 variable point sources.
Hartman J.D., Bersier D., Stanek K.Z., Beaulieu J.-P., Kaluzny J.,
Marquette J.-B., Stetson P.B., Schwarzenberg-Czerny A.
<Mon. Not. R. Astron. Soc., 371, 1405-1417 (2006)>
=2006MNRAS.371.1405H 2006MNRAS.371.1405H
ADC_Keywords: Surveys ; Galaxies, nearby ; Stars, variable ; Photometry, SDSS
Keywords: catalogues - surveys - Cepheids - stars: variables: other -
galaxies: individual: M33
Abstract:
We have conducted a variability survey of the Local Group galaxy M33,
using g', r', and i' observations from 27 nights spanning 17 months,
made with the MegaPrime/MegaCam instrument on the 3.6m CFHT telescope
(Canada-France-Hawaii Telescope). We identify more than 36000 variable
sources with g', r', i'≲24, out of approximately two million point
sources in a 1-deg2 field of view. This increases the number of
known variables in this galaxy by more than a factor of 20. In this
paper, we provide a brief description of the data and a general
overview of the variable star population which includes more than
1300 candidate variable blue and red supergiant stars, more than
2000 Cepheids, and more than 19000 long-period variable asymptotic
giant branch and red giant branch stars.
Description:
The data were obtained using the Queue Service Observing mode at the
CFHT on 27 separate nights between 2003 August and 2005 January. We
used the g', r' and i' Sloan filters, obtaining 36 images centred on
the galaxy with each filter.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table24.dat 300 36709 Catalogue of variable point sources in M33
table56.dat 138 59502 Catalogue of variables in M33 that do not match
to point sources
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See also:
http://www.astro.livjm.ac.uk/~dfb/M33/ : M33 CFHT variability survey web page
J/AJ/121/2032 : DIRECT variables in M33A field (Mochejska+, 2001)
J/AJ/122/2477 : DIRECT variables in M33B field (Mochejska+, 2001)
J/AJ/121/861 : DIRECT BVI photometry of central part of M33 (Macri+, 2001)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
Byte-by-byte Description of file: table24.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- [HBS2006] Sequential number,
[HBS2006] point source NNNNNN in Simbad
8- 9 I2 --- Chip Chip number
11- 16 I6 --- NChip Object number in the Chip
18- 19 I2 h RAh Right ascension (J2000)
20 A1 --- --- [:]
21- 22 I2 min RAm Right ascension (J2000)
23 A1 --- --- [:]
24- 28 F5.2 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
33 A1 --- --- [:]
34- 35 I2 arcmin DEm Declination (J2000)
36 A1 --- --- [:]
37- 40 F4.1 arcsec DEs Declination (J2000)
42- 47 F6.3 mag g'mag ?=99.999 g' magnitude
49- 54 F6.3 mag e_g'mag ?=99.999 rms uncertainty on g'mag
56- 61 F6.3 mag r'mag ?=99.999 r' magnitude
63- 68 F6.3 mag e_r'mag ?=99.999 rms uncertainty on r'mag
70- 75 F6.3 mag i'mag ?=99.999 i' magnitude
77- 82 F6.3 mag e_i'mag ?=99.999 rms uncertainty on i'mag
84 I1 --- Vg' [0/1] Variability flag in g' band (G1)
86 I1 --- Vr' [0/1] Variability flag in r' band (G1)
88 I1 --- Vi' [0/1] Variability flag in i' band (G1)
90- 95 F6.3 mag g'max ?=99.999 Maximum g' magnitude value
97-102 F6.3 mag g'min ?=99.999 Minimum g' magnitude value
104-109 F6.3 mag g'avg ?=99.999 Flux-averaged g' magnitude value
111-116 F6.3 mag e_g'avg ?=99.999 rms uncertainty on g'avg
118-123 F6.3 mag r'max ?=99.999 Maximum r' magnitude value
125-130 F6.3 mag r'min ?=99.999 Minimum r' magnitude value
132-137 F6.3 mag r'avg ?=99.999 Flux-averaged r' magnitude value
139-144 F6.3 mag e_r'avg ?=99.999 rms uncertainty on r'avg
146-151 F6.3 mag i'max ?=99.999 Maximum i' magnitude value
153-158 F6.3 mag i'min ?=99.999 Minimum i' magnitude value
160-165 F6.3 mag i'avg ?=99.999 Flux-averaged i' magnitude value
167-172 F6.3 mag e_i'avg ?=99.999 rms uncertainty on i'avg
174-192 A19 --- LGGS Massey et al., 2006, Cat. J/AJ/131/2478
designation, JHHMMSS.ss+DDMMSS.s
194-199 F6.3 mag Vmag ?=99.999 V magnitude, from LGGS
201-206 F6.3 mag e_Vmag ?=99.999 rms uncertainty on Vmag
208-213 F6.3 mag B-V ?=99.999 B-V colour index, from LGGS
215-220 F6.3 mag e_B-V ?=99.999 rms uncertainty on B-V
222-227 F6.3 mag V-R ?=99.999 V-R colour index, from LGGS
229-234 F6.3 mag e_V-R ?=99.999 rms uncertainty on V-R
236-256 A21 --- D33-1 Direct name, D33Jhhmmss.s+ddmmss.s,
Mochejska et al. (2001, cat. J/AJ/121/2032)
258-278 A21 --- D33-2 Direct name, D33Jhhmmss.s+ddmmss.s,
Mochejska et al. (2001, Cat. J/AJ/122/2477)
280-300 A21 --- D33-3 Direct name, D33Jhhmmss.s+ddmmss.s,
Macri et al. (2001, Cat. J/AJ/121/861)
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Byte-by-byte Description of file: table56.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- [HBS2006] Sequential number,
[HBS2006] not point source NNNNNN
8- 9 I2 --- Chip Chip number
11- 12 I2 h RAh Right ascension (J2000)
13 A1 --- --- [:]
14- 15 I2 min RAm Right ascension (J2000)
16 A1 --- --- [:]
17- 21 F5.2 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
26 A1 --- --- [:]
27- 28 I2 arcmin DEm Declination (J2000)
29 A1 --- --- [:]
30- 33 F4.1 arcsec DEs Declination (J2000)
35 I1 --- Vg' [0/1] Variability flag in g' band (G1)
37 I1 --- Vr' [0/1] Variability flag in r' band (G1)
39 I1 --- Vi' [0/1] Variability flag in i' band (G1)
41- 50 E10.3 --- g'avg ?=- Flux-averaged of the g' differential flux
light curve (1)
52- 61 E10.3 --- g'sig ?=- standard deviation of the differential
flux light curve in g' filter
63- 72 E10.3 --- g'chi2 ?=- Chi2 per degree of freedom about the
mean of the differential flux light curve
in g' filter
74- 84 E11.3 --- r'avg ?=- Flux-averaged of the r' differential flux
light curve (1)
86- 95 E10.3 --- r'sig ?=- standard deviation of the differential
flux light curve in r' filter
97-106 E10.3 --- r'chi2 ?=- Chi2 per degree of freedom about the
mean of the differential flux light curve
in r' filter
108-117 E10.3 --- i'avg ?=- Flux-averaged of the i' differential flux
light curve (1)
118-127 E10.3 --- i'sig ?=- standard deviation of the differential
flux light curve in i' filter
129-138 E10.3 --- i'chi2 ?=- Chi2 per degree of freedom about the
mean of the differential flux light curve
in i' filter
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Note (1): The flux units are such that a star with g'=25 would have a flux of 1.
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Global notes:
Note (G1): Detection flag is
1 = object detected as a variable in this filter
0 = object not detected as a variable in this filter
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History:
Copied at http://www.astro.livjm.ac.uk/~dfb/M33/
(End) Patricia Vannier [CDS] 21-May-2007