J/ApJS/193/26 The M33 synoptic stellar survey. I. (Pellerin+, 2011)
The M 33 synoptic stellar survey.
I. Cepheid variables.
Pellerin A., Macri L.M.
<Astrophys. J. Suppl. Ser., 193, 26 (2011)>
=2011ApJS..193...26P 2011ApJS..193...26P
ADC_Keywords: Photometry, UBVRI ; Stars, variable ; Galaxies, nearby
Keywords: galaxies: individual (M 33) - stars: variables: Cepheids
Abstract:
We have conducted a ground-based BVI synoptic survey of the Local
Group galaxy M33 which covers most of its disk and spans a period of
7 years. The survey targets luminous, long-period variables such as
Cepheids and Miras and combines images from the DIRECT project and
follow-up observations at the WIYN 3.5m telescope. This paper, the
first in a series, presents the discovery and characterization of 564
Cepheid variables, which represent a factor of two increase over
previous samples with calibrated point-spread function (PSF)
photometry. We also describe the details of the observations and
analysis of the survey data, including the use of archival Hubble
Space Telescope images to characterize biases in our ground-based PSF
photometry.
Description:
The DIRECT project obtained BVI observations of M33 over ∼200 nights
between 1996 September and 1999 November. Most of the survey was
carried out at the F.L. Whipple Observatory (FLWO) 1.2m telescope on
Mount Hopkins, Arizona, with additional images obtained at the
Michigan-Dartmouth-MIT 1.3m telescope on Kitt Peak, Arizona. The
project observed 11 different fields, each 11.5'x11.5' in size, which
covered most of the M33 disk (see Figure 1).
We collected additional images at the WIYN 3.5m telescope between
2002 August and 2006 December.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 34 1471 WIYN observation log
table3.dat 123 563 M33 Cepheids - main sample
table4.dat 123 45 Abnormally faint/likely type II Cepheids
table5.dat 123 55 Abnormally bright/likely blended Cepheids
table6.dat 123 35 Rejected variables
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See also:
J/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001)
J/AJ/121/870 : BVI photometry of Variables in M33 (Macri+, 2001)
J/AJ/122/1383 : DIRECT BVI photometry in M31 (Mochejska+, 2001)
J/AJ/122/2477 : DIRECT variables in M33B field (Mochejska+, 2001)
J/AJ/121/2032 : Direct variables in M33A field (Mochejska+, 2001)
http://www.astronomy.ohio-state.edu/~kstanek/CfA/DIRECT/ : DIRECT project
homepage
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" Obs.Date Date of the observation
12- 21 F10.5 d MJD Modified Julian Date of observation
23 A1 --- Field WIYN field
25 A1 --- Band [BVI] Band
27- 29 I3 s texp Exposure Time
31- 34 F4.2 arcsec Seeing Seeing
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Byte-by-byte Description of file: table[3456].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Cepheid identification (JHHMMSS.ss+DDMMSS.s)
21- 28 F8.5 deg RAdeg Right Ascention in decimal degrees (J2000)
30- 37 F8.5 deg DEdeg Declination in decimal degrees (J2000)
39- 45 F7.3 d Per Variability Period
47- 52 F6.3 mag Vmag ?=99.999 Mean magnitude in KPNO/WIYN V band (1)
54- 59 F6.3 mag Imag ?=99.999 Mean magnitude in KPNO/WIYN I band (1)
61- 66 F6.3 mag Bmag ?=99.999 Mean magnitude in KPNO/WIYN B band (1)
68- 72 F5.3 mag e_Vmag ?=9.999 Photometric error on Vmag (1)
74- 78 F5.3 mag e_Imag ?=9.999 Photometric error on Imag (1)
80- 84 F5.3 mag e_Bmag ?=9.999 Photometric error on Bmag (1)
86- 90 F5.3 mag Vamp ?=9.999 V band amplitude of photometric variation
92- 96 F5.3 mag Iamp ?=9.999 I band amplitude of photometric variation
98-102 F5.3 mag Bamp ?=9.999 B band amplitude of photometric variation
104-108 F5.3 mag Vcrw ?=9.999 V band crowding effect; statistical
110-114 F5.3 mag Icrw ?=9.999 I band crowding effect; statistical
116-120 F5.3 mag Bcrw ?=9.999 B band crowding effect; statistical
122-123 A2 --- Set Dataset on which the photometric values are
based (2)
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Note (1): All magnitudes are in the Vega system and corrected for crowding.
Note (2): Data set as follows:
WD = WIYN+DIRECT
WO = WIYN only
DO = DIRECT only
See section 3.1 for further details.
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History:
From electronic version of the journal
References:
Yuan et al., Paper II 2017AJ....153..170Y 2017AJ....153..170Y , Cat. J/AJ/153/170
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-May-2011