- SEARCH FOR PHOTOMETRIC ABUNDANCE INDICES FOR M DWARF STARS
- SEARCH FOR PHOTOMETRIC ABUNDANCE INDICES FOR M DWARF STARS
- ㆍ 저자명
- Lee. Sang-Gak
- ㆍ 간행물명
- 天文學會誌
- ㆍ 권/호정보
- 1982년|15권 2호|pp.49-58 (10 pages)
- ㆍ 발행정보
- 한국천문학회
- ㆍ 파일정보
- 정기간행물|ENG| PDF텍스트
- ㆍ 주제분야
- 기타
The UBVRIHKL magnitudes on Johnson system and space motions of M dwarf stars have been collected. This sample of M stars have been distinguished on a purely kinematical basis; the one with e<0.15, young disk population, with 0.15<e<0.3 old disk population, and with e>0.3 halo population. On the color-color diagrams and the color excess-orbital eccentricity diagrams, there is no distinction between the old disk stars and the young disk stars. However (I-H) color could be used to distinguish halo stars from young and old disk stars and the color excesses, ${Delta}(U-B),;{Delta}(B-V),;{Delta}(V-R),;{Delta}(H-K),;{Delta}(K-L),;and;{Delta}(B-R)$ can be used as abundance indicators only for the halo stars. But these color excesses which are measures of blue excesses, are positive for the halo stars with smaller eccentricities and become negative for those with larger eccentricities.