J/AJ/131/2478 M31 and M33 UBVRI photometry (Massey+, 2006)
A survey of Local Group galaxies currently forming stars.
I. UBVRI photometry of stars in M31 and M33.
Massey P., Olsen K.A.G., Hodge P.W., Strong S.B., Jacoby G.H.,
Schlingman W., Smith R.C.
<Astron. J., 131, 2478-2496 (2006)>
=2006AJ....131.2478M 2006AJ....131.2478M
ADC_Keywords: Galaxies, nearby ; Photometry, CCD ; Photometry, UBVRI
Keywords: catalogs - galaxies: individual (M31, M33) -
galaxies: stellar content - stars: early-type - supergiants - surveys
Abstract:
We present UBVRI photometry obtained from Mosaic images of M31 and M33
using the Kitt Peak National Observatory 4m telescope. We describe our
data reduction and automated photometry techniques in some detail,
as we will shortly perform a similar analysis of other Local Group
galaxies. The present study covered 2.2deg2 along the major axis of
M31 and 0.8deg2 on M33, chosen so as to include all of the regions
currently active in forming massive stars. We calibrated our data
using photometry from the Lowell 1.1m telescope, and this external
method resulted in millimagnitude differences in the photometry of
overlapping fields, providing some assurance that our photometry is
reliable. The final catalog contains 371781 and 146622 stars in M31
and M33, respectively, where every star has a counterpart in (at
least) the B, V, and R passbands. Our survey goes deep enough to
achieve 1%-2% photometry at 21mag (corresponding to stars more massive
than 20M☉) and achieves <10% errors at ∼U ∼B ∼V ∼R ∼I 23mag.
Description:
The data were taken with the Mosaic CCD camera at the prime focus of
the 4m Mayall telescope. The observing began in 2000 August and ran
through 2002 September.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 142 371781 M31 Catalog
table5.dat 145 146622 M33 Catalog
table8.dat 124 172 M31 members confirmed by spectroscopy
table9.dat 127 361 M33 members confirmed by spectroscopy
refs.dat 87 22 References
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See also:
J/AJ/115/1894 : M31A eclipsing binaries and Cepheids (Stanek+ 1998)
J/AJ/115/1016 : M31B eclipsing binaries and Cepheids (Kaluzny+ 1998)
J/AJ/117/2810 : M31C eclipsing binaries and Cepheids (Stanek+, 1999)
J/AJ/118/346 : M31D eclipsing binaries and Cepheids (Kaluzny+ 1999)
J/AJ/118/2211 : M31F eclipsing binaries and Cepheids (Mochejska+ 1999)
J/AJ/122/1383 : DIRECT BVI photometry in M31 (Mochejska+, 2001)
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/121/2032 : DIRECT variables in M33A field (Mochejska+, 2001)
J/AJ/122/2477 : DIRECT variables in M33B field (Mochejska+, 2001)
J/AJ/126/175 : M31Y eclipsing binaries and Cepheids (Bonanos+, 2003)
Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 19 A19 -- LGGS LGGS designation, JHHMMSS.ss+DDMMSS.s
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 31 F5.2 s RAs [0/60] Right ascension (J2000)
33 A1 -- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 43 F4.1 arcsec DEs [0/60] Declination (J2000)
45- 50 F6.3 mag Vmag Johnson V magnitude
52- 57 F6.3 mag e_Vmag V error
59- 64 F6.3 mag B-V Johnson B-V magnitude
66- 71 F6.3 mag e_B-V B-V error
73- 78 F6.3 mag U-B ?=99.999 Johnson U-B colour index
80- 85 F6.3 mag e_U-B ?=99.999 U-B error
87- 92 F6.3 mag V-R Kron-Cousins V-R colour index
94- 99 F6.3 mag e_V-R V-R error
101-106 F6.3 mag R-I ?=99.999 Kron-Cousins R-I colour index
108-113 F6.3 mag e_R-I ?=99.999 R-I error
115-116 I2 -- nV Number of V measurements
118-119 I2 -- nB Number of B measurements
121-122 I2 -- nU Number of U measurements
124-125 I2 -- nR Number of R measurements
127-128 I2 -- nI Number of I measurements
130-139 A10 -- SpType MK Spectral Type (if available)
141-145 A5 -- r_SpType References for spectal type, in refs.dat file
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Byte-by-byte Description of file: table8.dat table9.dat
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Bytes Format Units Label Explanations
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1- 15 A15 -- MType Spectral Classification (1)
17- 35 A19 -- LGGS LGGS designation, JHHMMSS.ss+DDMMSS.s
37- 38 I2 h RAh Right ascension (J2000)
40- 41 I2 min RAm Right ascension (J2000)
43- 47 F5.2 s RAs Right ascension (J2000)
49 A1 -- DE- Declination (J2000)
50- 51 I2 deg DEd Declination (J2000)
53- 54 I2 arcmin DEm Declination (J2000)
56- 59 F4.1 arcsec DEs Declination (J2000)
62- 66 F5.2 mag Vmag Johnson V magnitude
68- 72 F5.2 mag B-V Johnson B-V colour index
74- 78 F5.2 mag U-B ?=99.99 Johnson U-B colour index
80- 85 F6.3 mag V-R Kron-Cousins V-R magnitude
87- 91 F5.2 mag R-I ?=99.99 Kron-Cousins R-I colour index
93-102 A10 -- SpType MK Spectral Type
104 A1 -- Key [UM] Note (2)
106-121 A16 -- CrossID Cross-identification (3)
123-127 A5 -- r_SpType References for spectral type, in refs.dat file
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Note (1): The membership of the "RSG Candidates" is uncertain.
Note (2): Note as follows:
U = Uncertain identification
M = Multiple on a 1" spatial scale
Note (3): Coordinates substantially improved for M33WR14, M33WR15,
M33WR112, M33WR113, M33WR116, and M33WR117.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
45- 87 A43 --- Com Comments
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History:
* 22-May-2007: From electronic version of the journal
* 29-Aug-2007: Specification of the actual photometric system in this ReadMe
(Johnson-Kron-Cousins)
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 22-May-2007