J/A+A/410/795 Photometry of NGC 3109 carbon stars (Demers+, 2003)
Carbon star survey in the Local Group.
VII. NGC 3109 a galaxy without a stellar halo.
Demers S., Battinelli P., Letarte B.
<Astron. Astrophys. 410, 795 (2003)>
=2003A&A...410..795D 2003A&A...410..795D
ADC_Keywords: Galaxies, photometry ; Stars, carbon ; Photometry, CCD
Keywords: galaxies: individual: NGC 3109 - galaxies: stellar populations -
galaxies: structure
Abstract:
We present a CFH12K wide field survey of the carbon star population in
and around NGC 3109. Carbon stars, the brightest members of the
intermediate-age population, were found nearly exclusively in and near
the disk of NGC 3109, ruling out the existence of an extensive
intermediate-age halo like the one found in NGC 6822. Over 400 carbon
stars identified have MI=-4.71, confirming the nearly universality
of mean magnitude of C star populations in Local Group galaxies. Star
counts over the field reveal that NGC 3109 is a truncated disk shaped
galaxy without an extensive stellar halo. The minor axis star counts
reach the foreground density between 4' and 5', a distance that can be
explained by an inclined disk rather than a spheroidal halo. We
calculate a global C/M ratio of 1.75±0.20, a value expected for such
a metal poor galaxy.
Description:
We list the apparent I magnitude, (R-I) and (CN-TiO) colour indices of
471 carbon stars identified in NGC 3109. The observations were obtained
in March 2002, with the CFH12K camera attached to the CFHT.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 446 Positions and photometry of 471 C stars
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See also:
J/AJ/119/2780 : C star in 1613 (Albert+, 2003)
J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000)
J/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002)
J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)
J/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003)
J/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004)
J/A+A/417/479 : RI photometry of NGC 185 carbon stars (Battinelli+, 2004)
J/A+A/418/33 : RI photometry of C stars in NGC 147 (Battinelli+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Seq Running number
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 18 F5.2 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000.0)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 32 F5.2 arcsec DEs Declination (J2000.0)
35- 40 F6.3 mag Imag I magnitude
43- 48 F6.3 mag e_Imag Error on Imag
51- 56 F6.3 mag R-I R-I colour index
59- 64 F6.3 mag e_R-I Error on R-I
67- 72 F6.3 mag CN-TiO CN-TiO colour index
75- 80 F6.3 mag e_CN-TiO Error on CN-TiO
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Acknowledgements: Serge Demers
References:
Albert et al., Paper I 2000AJ....119.2780A 2000AJ....119.2780A
Battinelli & Demers, Paper II 2000AJ....120.1801B 2000AJ....120.1801B, Cat. J/AJ/120/1801
Demers & Battinelli, Paper III 2002AJ....123..238D 2002AJ....123..238D
Letarte et al., Paper IV 2002AJ....123..832L 2002AJ....123..832L, Cat. J/AJ/123/832
Battinelli et al., Paper V 2003AJ....125.1298B 2003AJ....125.1298B, Cat. J/AJ/125/1298
Demers et al., Paper VI 2003AJ....125.3037D 2003AJ....125.3037D
Battinelli & Demers, Paper VIII 2004A&A...418...33B 2004A&A...418...33B Cat. J/A+A/418/33
Battinelli & Demers, Paper IX 2004A&A...417..479B 2004A&A...417..479B Cat. J/A+A/417/479
Battinelli & Demers, Paper X 2004A&A...416..111B 2004A&A...416..111B Cat. J/A+A/416/111
(End) Serge Demers [Universite de Montreal] 05-Sep-2003