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Figure 1:
The results from artificial star experiments. Solid, dotted and dashed lines
represent J, H and K bands, respectively. Completeness
is defined as the number of recovered artificial stars divided by the total number of stars added.
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Figure 2:
(K, J-K) and (K, H-K) CMDs of the total observed area ( upper)
and the outer region ( lower) of NGC 147.
The loci with thin lines trace the photometric evolution of AGB tip
in the range of log
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Figure 3: (H-K)-(J-H) and (H-K)-(J-K) color-color diagrams for AGB stars brighter than K=18. Dotted boxes contain C stars with (J-K) > 1.34 and (H-K) > 0.44. The loci are the color sequences of the tip of AGB stars as in Fig. 2. Open circles are 34 C stars cross-identified in both near-infrared photometry (this paper) and TiO and CN bands photometry (Nowotny et al. 2003). |
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Figure 4: Color-color diagrams of JHK and VRI bands for 34 cross-identified C stars with (V-i)0 indices from Nowotny et al. (2003) and 14 cross-identified C stars with (R-I) indices from Battinelli & Demers (2004c). Vertical dotted lines are the near-infrared color ranges of C stars, i.e. (J-K)>1.34 and (H-K)>0.44, while horizontal dotted lines are the color ranges of C stars in VRI bands, i.e. (V-i)0>1.16 and (R-I)>1.06, given by Nowotny et al. (2003) and Battinelli & Demers (2004c). |
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Figure 5:
Histogram distributions of the (J-K) and (H-K) colors of stars with K between 15.5 and 18.0 mag.
Arrows mark the theoretically predicted colors of the AGB tip for Z = 0.019 isochrones of
log
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Figure 6: Left: the completeness corrected LFs in MK for M giant stars and C stars. The inner small panel in the lower panel shows the logarithmic LF of M giant stars in NGC 147. Right: the completeness corrected bolometric LFs for M giant stars and C stars. |
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Figure 7:
Relationship between the K magnitude of the AGB tip and age at the distance of NGC 147, as predicted
by isochrones (Girardi et al. 2002) for
Z = 0.004 (solid line),
0.008 (dotted line) and
0.019 (dashed line). The shadow bar represents the range of AGB tip brightness for stars
having log (
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