J/AJ/121/861 BVI photometry of central part of M33 (Macri+, 2001)
The DIRECT project: catalogs of stellar objects in nearby galaxies.
I. The central part of M33.
Macri L.M., Stanek K.Z., Sasselov D.D., Krockenberger M., Kaluzny J.
<Astron. J. 121, 861 (2001)>
=2001AJ....121..861M 2001AJ....121..861M
ADC_Keywords: Galaxies, nearby ; Photometry, UBVRI
Keywords: galaxies: individual (M33) - galaxies: stellar content
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. The search for these
variables requires time-series photometry of large areas of the target
galaxies and yields magnitudes and positions for tens of thousands of
stellar objects, which may be of use to the astronomical community at
large. During the first phase of the project, between 1996 September
and 1997 October, we were awarded 95 nights on the F. L. Whipple
Observatory 1.2 m telescope and 36 nights on the
Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and Cepheids
in the M31 and M33 galaxies. This paper, the first in our series of
stellar catalogs, lists the positions, three-color photometry, and
variability indices of 57,581 stars with 14.4<V<23.6 in the
central part of M33. The catalog is available from our FTP site.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 515 Log of Observations
table3.dat 85 57581 Catalog of stars in the central part of M33
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See also:
http://cfa-www.harvard.edu/~kstanek/DIRECT/ : DIRECT Project homepage
J/AJ/121/870 : Variables in the central part of M33 BVI phot. (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- 10 A10 "YYYY/MM/DD" Date UT date of observation
12 A1 --- f_Date [d] Indicates a photometric night with
standards observed
14- 25 F12.4 d JD Julian date of observation
27- 30 A4 --- Field Field observed
32 A1 --- Band Filter band used
34 A1 --- Tel Telescope used (1)
36- 39 F4.2 arcsec See Telescope seeing
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Note (1):
F = Fred L. Whipple Observatory;
M = MDM observatory.
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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- 3 A3 --- --- [D33]
4- 21 A18 --- D33 Designation JHHMMSS.s+DDMMSS.s (1)
23- 24 I2 h RAh Right ascension (J2000.0)
26- 27 I2 min RAm Right ascension (J2000.0)
29- 33 F5.2 s RAs Right ascension (J2000.0)
35 A1 --- DE- Declination sign (J2000.0)
36- 37 I2 deg DEd Declination (J2000.0)
39- 40 I2 arcmin DEm Declination (J2000.0)
42- 46 F5.2 arcsec DEs Declination (J2000.0)
48- 52 F5.2 mag Vmag Johnson V magnitude
54- 58 F5.2 mag Imag ?=99.99 CCD Cousins I magnitude
60- 64 F5.2 mag Bmag ?=99.99 CCD Johnson B magnitude
66- 69 F4.2 mag e_Vmag rms uncertainty on Vmag
71- 74 F4.2 mag e_Imag ?=9.99 rms uncertainty on Imag
76- 79 F4.2 mag e_Bmag ?=9.99 rms uncertainty on Bmag
81- 85 F5.2 --- JS V-band JS variability index
(Stetson, 1987PASP...99..191S 1987PASP...99..191S) (2)
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Note (1): D33 JHHMMSS.s+DDMMSS.s in Simbad
Note (2): Candidate variables are selectioned if they met two requirements:
a JS index larger than 0.75 and a V-band magnitude uncertainty larger
than 0.04mag. The second criterion was introduced to remove bright
stars with small variability.
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History:
From electronic version of the journal and copied at
ftp://cfa-ftp.harvard.edu/pub/kstanek/DIRECT/star_catalog/M33ABC/
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2001