J/A+A/437/61 Near-IR photometry of AGB stars in NGC 185 (Kang+, 2005)
Near-IR photometry of asymptotic giant branch stars in the dwarf elliptical
galaxy NGC 185.
Kang A., Sohn Y.-J., Rhee J., Shin M., Chun M.-S., Kim H.-I.
<Astron. Astrophys. 437, 61 (2005)>
=2005A&A...437...61K 2005A&A...437...61K
ADC_Keywords: Stars, giant ; Stars, carbon ; Photometry, infrared
Keywords: galaxies: individual: NGC 185 - galaxies: stellar content -
stars: AGB and post-AGB
Abstract:
J, H and K' images obtained with the Canada-France-Hawaii Telescope
were used to investigate the stellar contents of asymptotic giant
branch (AGB) in the dwarf elliptical galaxy NGC 185. The bright parts
of (K, J-K) and (K, H-K) color-magnitude diagrams consist of a group
of brights blue stars, a dominant populations of M-giants, and a red C
star population. There were 73 C stars with a mean magnitude of
=16.26±0.38, corresponding to <MK≥-7.93 and mean colors of
<(J-k)0≥2.253 and <(H-K)0≥0.865. The number ratio of C stars to
M-giants was estimated to be 0.11±0.04 without any radial gradient
from the center of NGC 185. The (J-K) and (H-K) color distributions of
AGB stars showed an M-giant pick, blue and red tails, where the
latter two correspond to AGB stars younger than those along M-giant
peak and C stars. The bolometric luminosity functions of M-giants and
C stars indicated that the M-giant AGB sequence has terminated at
Mbol=-6.2, while the most luminous C star very similar to that of
Nowotny et al. (2003, Cat. J/A+A/403/93) which was derived from VI
band photometry. The logarithmic slope of the luminosity function for
bright M-giant stars was estimated to be 0.83±0.02 in K band.
Theoritical isochrone models, compared with the observed near-infrared
photometric properties of AGB stars, indicated that the star formation
in NGC 185 has a wide range of age span with possibly two different
epochs of star formation.
Description:
Table2 contains the equatorial coordinates, near-infrared photometric
properties of 73 C stars, and color indices in VRI bands of
cross-identified C stars with Nowotny et al. (2003, Cat.
J/A+A/403/93) and Battinelli & Demers (2004, Cat. J/A+A/417/479).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 98 73 Coordinates and near-IR photometric properties
for 73 C stars
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See also:
J/A+A/417/479 : RI photometry of NGC 185 carbon stars (Battinelli+, 2004)
J/A+A/403/93 : Photometry of AGB stars in NGC 185 and NGC 147 (Nowotny+, 2003)
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 Identification number of C star
6- 7 I2 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 Jmag J band magnitude of C star
38- 42 F5.3 mag e_Jmag Error of J magnitude
45- 49 F5.3 mag (J-K) (J-K) colour index
51- 55 F5.3 mag e_(J-K) Error of (J-K) colour
58- 62 F5.3 mag (H-K) (H-K) colour index
64- 68 F5.3 mag e_(H-K) Error of (H-K) colour
71- 74 F4.2 mag (V-i)o ? (V-i) colour by Nowotny et al.
(2003, Cat. J/A+A/403/93)
76- 78 I3 --- Nint ? Internal number for [NKO2003] source
80- 87 I8 --- [NKO2003] ? Identification number of Nowotny et al.
(2003, Cat. J/A+A/403/93),
[NKO2003] NGC 185 NNNNNNNN in Simbad
90- 94 F5.3 mag R-I ? (R-I) color by Battinelli & Demers
(2004, Cat. J/A+A/417/479)
96- 98 I3 --- [BD2004b] ? Identification number of Battinelli &
Demers (2004, Cat. J/A+A/417/479)
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Acknowledgements: Aram Kang, breeze82(at)galaxy.yonsei.ac.kr
(End) Patricia Vannier [CDS] 21-Mar-2005