Near-IR photometry of asymptotic giant branch stars in the dwarf elliptical galaxy NGC 147

Details Near-IR photometry of asymptotic giant branch stars in the dwarf elliptical galaxy NGC 147 Near-IR photometry of asymptotic giant branch stars in the dwarf elliptical galaxy NGC 147

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...445...69s&link_type=abstract

Astronomy and Astrophysics, Volume 445, Issue 1, January I 2006, pp.69-77

Astronomy and Astrophysics

Astrophysics

12

Galaxies: Individual: Ngc 147, Galaxies: Stellar Content, Stars: Agb And Post-Agb

Scientific paper

Near-infrared J, H and K' images were used to investigate the stellar contents of the asymptotic giant branch (AGB) population in the nearby dwarf elliptical galaxy NGC 147. The obtained (K, J-K) and (K, H-K) color-magnitude diagrams contain stars of AGB and red giant branch populations, where the former consists of a group of bright blue stars, a dominant population of M giant and a red C star population. We identified 91 AGB C stars in NGC 147 with the mean absolute magnitude and colors of < M_K> = -7.56, <(J-K)_0> = 1.81 and <(H-K)_0> = 0.74. The estimated number ratio of C stars to M giant stars (C/M) is 0.16±0.02. The estimated local C/M ratios of 0.14± 0.02 for the inner region (r<70'') and 0.19± 0.03 for the outer region (r>70'') indicate a weak radial gradient. The mean bolometric magnitude of 91 C stars in NGC 147 is < M_bol> = -4.32± 0.49. The bolometric luminosity function of M giant stars in NGC 147 extends up to M_bol = -5.8 mag, and that of only C stars spans -5.6

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