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J/A+A/543/A35       Near-IR photometry of C stars in NGC 205       (Jung+, 2012)

Near-infrared properties of asymptotic giant branch stars in nearby dwarf elliptical galaxy NGC 205. Jung M.Y., Ko J., Kim J.-W., Chun S.-H., Kim H.-I., Sohn Y.-J. <Astron. Astrophys. 543, A35 (2012)> =2012A&A...543A..35J
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Stars, carbon ; Photometry, infrared Keywords: galaxies: individual: NGC205 - galaxies: stellar content - stars: AGB and post-AGB Abstract: We investigated the distribution of resolved asymptotic giant branch (AGB) stars over a much larger area than covered by previous near-infrared studies in the nearby dwarf elliptical galaxy NGC 205. Using data obtained with the WIRCam near-infrared imager of the CFHT, we selected the AGB stars in the JHKs color - magnitude diagrams, and separated the C stars from M-giant stars in the JHKs color - color diagram. We identified 1,550 C stars in NGC 205 with a mean absolute magnitude of <M_Ks≥-7.49±0.54, and colors of <(J-K)_0≥1.81±0.41 and <(H-Ks)_0≥0.76±0.24. The ratio of C stars to M-giant stars was estimated to be 0.15±0.01 in NGC 205, and the local C/M ratios for the southern region are somewhat lower than those for the northern region. The (J-K) color distributions of AGB stars contain the main peak of the M-giant stars and the red tail of the C stars. A comparison of the theoretical isochrone models with the observed color distribution indicates that most of the bright M-giant stars in NGC 205 were formed at log(tyr)∼9.0-9.7. The logarithmic slope of the MKs luminosity function for M-giant stars was estimated to be 0.84±0.01, which is comparable with dwarf elliptical galaxies NGC 147 and NGC 185. Furthermore, we found that the logarithmic slopes of the MKs luminosity function for C and M-giant stars are different to places, implying a different star formation history within NGC 205. The bolometric luminosity function for M-giant stars extends to Mbol=-6.0mag, and that for C stars spans -5.6<Mbol←3.0. The bolometric luminosity function of C stars is unlikely to be a Gaussian distribution and the mean bolometric magnitude of C stars is estimated to be Mbol=-4.24±0.55, which is consistent with our results for dwarf elliptical galaxies NGC 147 and NGC 185. Description: Table 1 lists the equatorial coordinates, near-infrared photometric properties of 1,550 C stars, and color indices in RI bands of cross-identified C stars with Demers et al. (2003, Cat. J/AJ/125/3037). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 113 1550 Coordinates and photometric properties for 1550 C stars in NGC 205
See also: J/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID ID number of C star 7 I1 h RAh Right Ascension J2000 (hours) 9- 10 I2 min RAm Right Ascension J2000 (minutes) 12- 16 F5.2 s RAs Right Ascension J2000 (seconds) 18 A1 --- DE- Declination J2000 (sign) 19- 20 I2 deg DEd Declination J2000 (degrees) 22- 23 I2 arcmin DEm Declination J2000 (minutes) 25- 28 F4.1 arcsec DEs Declination J2000 (seconds) 31- 36 F6.3 mag Ksmag Ks band magnitude of C star 38- 42 F5.3 mag e_Ksmag Error of Ks magnitude 45- 49 F5.3 mag J-Ks J-Ks color index 51- 55 F5.3 mag e_J-Ks Error of J-Ks color index 58- 62 F5.3 mag H-Ks H-Ks color index 64- 68 F5.3 mag e_H-Ks Error of H-Ks color index 71- 76 F6.3 mag Imag ? I band magnitude of C star (1) 78- 82 F5.3 mag e_Imag ? Error of I magnitude (1) 85- 89 F5.3 mag R-I ? R-I color index (1) 91- 95 F5.3 mag e_R-I ? Error of R-I color index (1) 98-102 F5.3 mag CN-TiO ? CN-TiO color index (1) 104-108 F5.3 mag e_CN-TiO ? Error of CN-TiO color index (1) 111-113 I3 --- [DBL2003] ? ID number of Demers et al., 2003, Cat. J/AJ/125/3037
Note (1): From Demers et al., 2003, Cat. J/AJ/125/3037
Acknowledgements: MiYoung Jung, myjung(at)
(End) Patricia Vannier [CDS] 25-Jul-2012
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