J/A+A/417/479 RI photometry of NGC 185 carbon stars (Battinelli+, 2004)
Carbon star survey of Local Group galaxies. IX. The spheroidal galaxy NGC 185.
Battinelli P., Demers S.
<Astron. Astrophys. 417, 479 (2004)>
=2004A&A...417..479B 2004A&A...417..479B
ADC_Keywords: Stars, carbon ; Photometry, RI ; Photometry, CCD
Keywords: galaxies: individual: NGC 185 - galaxies: stellar content -
galaxies: structure
Abstract:
We used the CFH12K wide field camera to survey the carbon star
population of NGC 185 using the CN-TiO technique. 145 C stars are
identified with a mean =19.99±0.05, corresponding to
<MI≥-4.41±0.05, a mean luminosity similar to what was recently
found for the C star population of NGC 147. The stellar surface
density profile of NGC 185 follows a power law with an exponential
scale length of 2.53±0.07'. The surface density of C stars follows
also a power law but with a smaller scale length, 1.56±0.06,
demonstrating that the intermediate-age population of NGC 185 is more
concentrated than its old population. A tidal radius, rt=22.5±2.2'
is determined from red giant star counts. The C/M ratio of NGC 185 is
0.17±0.02 with no apparent sign of a radial gradient. We compare the
carbon star populations of NGC 185 and NGC 147 to conclude that it is
unlikely that they form a close pair.
Description:
The observations were made in Service Queue observing mode in August
2002 with the CFH12K camera installed at the prime focus of the 3.66m
Canada-France-Hawaii Telescope. The detector is a 12000x8000 pixel
mosaic covering a field of 42x28'; the pixel size is 0.206arcsec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 77 145 Positions and photometry of 145 C stars
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See also:
J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000)
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/A+A/410/795 : Photometry of NGC 3109 carbon stars (Demers+, 2003)
J/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/145] Running number
5- 6 I2 h RAh Right ascension (J2000.0)
8- 9 I2 min RAm Right ascension (J2000.0)
11- 15 F5.2 s RAs Right ascension (J2000.0)
18 A1 --- DE- Declination sign (J2000.0)
19- 20 I2 deg DEd Declination (J2000.0)
22- 23 I2 arcmin DEm Declination (J2000.0)
25- 29 F5.2 arcsec DEs Declination (J2000.0)
32- 37 F6.3 mag Imag I magnitude (Mould filter 832.6nm)
40- 45 F6.3 mag e_Imag Error on Imag
48- 53 F6.3 mag R-I R-I colour index (Mould filters 649.3 832.6nm)
56- 61 F6.3 mag e_R-I Error on R-I
64- 69 F6.3 mag CN-TiO CN-TiO colour index (1)
72- 77 F6.3 mag e_CN-TiO Error on CN-TiO
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Note (1): filters CN and TiO centered at 808.6 and 768.9 nm,
respectively (bandwidth 18nm).
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Acknowledgements: Paolo Battinelli
References:
Albert et al., Paper I 2000AJ....119.2780A 2000AJ....119.2780A Cat. J/AJ/119/2780
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
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 Cat. J/AJ/125/3037
Demers et al., Paper VII 2003A&A...410..795D 2003A&A...410..795D Cat. J/A+A/410/795
Battinelli & Demers Paper X 2004A&A...416..111B 2004A&A...416..111B Cat. J/A+A/416/111
(End) Patricia Bauer [CDS] 23-Mar-2004