J/AJ/129/729 CCD photometry of luminous stars in M33 (Rowe+, 2005)
Carbon stars and other luminous stellar populations in M33.
Rowe J.F., Richer H.B., Brewer J.P., Crabtree D.R.
<Astron. J., 129, 729-744 (2005)>
=2005AJ....129..729R 2005AJ....129..729R
ADC_Keywords: Stars, carbon ; Photometry ; Galaxies, nearby ; Stars, luminous
Keywords: galaxies: individual (M33) - galaxies: stellar content - stars: carbon
Abstract:
The M33 galaxy is a nearby, relatively metal-poor, late-type spiral.
Its proximity and almost face-on inclination means that it projects
over a large area on the sky, making it an ideal candidate for
wide-field CCD mosaic imaging. Photometry was obtained for more than
106 stars covering a 74'x56' field centered on M33. Main-sequence,
supergiant branch, red giant branch, and asymptotic giant branch (AGB)
populations are identified and classified based on broadband V and I
photometry. Narrowband filters are used to measure spectral features
allowing, the AGB population to be further divided into C and M star
types. The galactic structure of M33 is examined using star counts,
color-color, and color-magnitude-selected stellar populations. We use
the C to M star ratio to investigate the metallicity gradient in the
disk of M33.
Description:
Multiband photometric data were collected on 1999 October 30 and 31
and 2000 December 3 and 4 with the 3.58m Canada-France-Hawaii
Telescope (CFHT).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 105 12109 Object catalog for M33
--------------------------------------------------------------------------------
See also:
J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)
J/ApJ/469/629 : UV-brightest stars of M33 and its nucleus (Massey+ 1996)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- Seq Star identification number
7 I1 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of the Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000)
30- 36 F7.4 mag Vmag ?=99.9990 Mould V band magnitude (1)
38- 43 F6.4 mag e_Vmag ?=9.9990 ALLSTAR 1σ error in Vmag
45- 51 F7.4 mag Imag ?=99.9990 Mould I band magnitude (1)
53- 58 F6.4 mag e_Imag ?=9.9990 ALLSTAR 1σ error in Imag
60- 66 F7.4 mag CNmag ?=99.9990 CN band magnitude (1)
68- 73 F6.4 mag e_CNmag ?=9.9990 ALLSTAR 1σ error in CNmag
75- 81 F7.4 mag TiOmag ?=99.9990 TiO band magnitude (1)
83- 88 F6.4 mag e_TiOmag ?=9.9990 ALLSTAR 1σ error in TiOmag
90- 96 F7.4 --- chi2 The χ2 DAOPhot value for the PSF fit
98-105 F8.4 --- Sharp The sharp DAOPhot value for the PSF fit
--------------------------------------------------------------------------------
Note (1): The filter passbands are:
---------------------------------
Filter Central Bandwidth
Wavelength
---------------------------------
MouldV 537.4nm 97.4nm
MouldI 822.3 216.4
TiO 777.7 18.4
CN 812.0 12.1
---------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Jul-2005