The JHKs Magnitudes of the Red Giant Branch Tip and the Distance Moduli of Nearby Dwarf Galaxy NGC 205
We have used the near-infrared JHKS photometric data of resolved stars in a nearby dwarf elliptical galaxy NGC 205 to determine the magnitudes of the red giant branch tip (TRGB). By applying Savitzky-Golay filter to the observed luminosity functions (LFs) in each band, we derived the second deriv...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2009-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2009/v26n4/OJOOBS_2009_v26n4_417.pdf |
| Summary: | We have used the near-infrared JHKS photometric data of resolved stars in a nearby
dwarf elliptical galaxy NGC 205 to determine the magnitudes of the red giant branch
tip (TRGB). By applying Savitzky-Golay filter to the observed luminosity functions
(LFs) in each band, we derived the second derivatives of the LFs so as to determine the
magnitudes of the TRGB. Absolute magnitudes of the TRGB in JHKs bands were
measured from the Yonsei-Yale isochrones. By comparing the determined apparent
magnitudes and the theoretical absolute magnitudes of the TRGB, we estimated the
distance moduli of NGC 205 to be (m-M) = 24.10±0:08, 24.08±0.12 and 24.14±0.14 in J, H, and Ks bands, respectively. |
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| ISSN: | 2093-5587 2093-1409 |