UNIVERSALITY OF THE NEAR-INFRARED EXTINCTION LAW BASED ON THE APOGEE SURVEY
UNIVERSALITY OF THE NEAR-INFRARED EXTINCTION LAW BASED ON THE APOGEE SURVEY
复制标题
基于远地点巡天的近红外消光定律的普适性
DOI:
10.1088/2041-8205/788/1/l12
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发表时间:
2014-05
影响因子:
7.9
通讯作者:
Jiang B. W.
中科院分区:
文献类型:
--
作者:
Wang Shu;Jiang B. W.
Whether the near-infrared (NIR) extinction law is universal has long been a debated topic. Based on the APOGEE H-band spectroscopic survey, a key project of SDSS-III, the intrinsic colors of a large number of giant stars are accurately determined from the stellar effective temperature. Taking advantage of this and using a sample of 5942 K-type giants, the NIR extinction law is carefully revisited. The color excess ratio E(J − H)/E(J − KS), representative of the NIR extinction law, shows no dependence on the color excess when E(J − KS) changes from ∼0.3 to ∼4.0, which implies a universal NIR extinction law from diffuse to dense regions. The constant value of E(J − H)/E(J − KS), 0.64, corresponds to a power law index of 1.95. The other two ratios, E(H − KS)/E(J − KS) and E(J − H)/E(H − KS), are 0.36 and 1.78, respectively. The results are consistent with the MRN dust size distribution.
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发表时间:
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2009-02
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
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作者:
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