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HD 21777
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관련 글
Reddening and the Extinction Law at High Galactic Latitude
We present near-infrared (JHKL) photometry of 103 southern stars locatedbehind translucent interstellar clouds at high Galactic latitude. Ourdata are combined with visual photometry and spectral type informationfrom the literature in a detailed analysis of the wavelength dependenceof interstellar extinction by dust in these high-latitude clouds. Weinvestigate the shape of the near-infrared extinction curve and evaluatethe total line-of-sight extinction (AV) and ratio oftotal-to-selective extinction (RV) in each line of sight.Sources of uncertainty in RV arising from photometric errorsand spectral classification errors are carefully assessed and quantifiedas functions of the line-of-sight reddening. We detect appreciabledifferences in our results compared with the average extinction curvefor dust in the diffuse interstellar medium (ISM) close to the Galacticplane. Assuming a power-law form in the near-infrared, we find the meanfor high-latitude clouds to be well described by
~λ-2.3, somewhat steeperthan that for the diffuse ISM(
~λ-1.8). Our sampleincludes a substantial number of lines of sight with low RVvalues (47% with RV<2.8) relative to the diffuse ISMaverage of 3.05+/-0.15. We conclude that many high-latitude clouds haveenhanced abundances of relatively small grains.
새 글 등록
관련 링크
- 링크가 없습니다. -
새 링크 등록
다음 그룹에 속해있음:
Henry Draper Catalogue
Hipparcos
[모든 그룹 보기]
관측 및 측정 데이터
별자리:
황소자리
적경:
03
h
30
m
44.74
s
적위:
+05°30'47.1"
가시등급:
7.684
거리:
241.546 파섹
적경상의 고유운동:
6.9
적위상의 고유운동:
-2.5
B-T magnitude:
7.906
V-T magnitude:
7.703
천체목록:
일반명
(
Edit
)
HD 1989
HD 21777
TYCHO-2 2000
TYC 70-204-1
USNO-A2.0
USNO-A2 0900-00807458
HIP
HIP 16356
→ VizieR에서 더 많은 목록을 가져옵니다.