UNIVERSALITY OF THE NEAR-INFRARED EXTINCTION LAW BASED ON THE APOGEE SURVEY

UNIVERSALITY OF THE NEAR-INFRARED EXTINCTION LAW BASED ON THE APOGEE SURVEY
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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.
Jiang B. W.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang Shu;Jiang B. W.

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近红外消光定律是否具有普适性一直是一个有争议的话题。基于SDSS-III的重点项目APOGEE H波段光谱巡天,从恒星有效温度精确测定了大量巨星的内禀色。利用这一点,并使用5942个K型巨星的样本,仔细地重新审视了近红外消光定律。代表NIR消光定律的颜色过量比E(J-H)/E(J-KS)显示出当E(J-KS)从   0.3至   4.0,这意味着一个普遍的近红外消光规律从弥漫到密集区。E(J-H)/E(J-KS)的常数值为0.64,对应的幂律指数为1.95。另外两个比值E(H-KS)/E(J-KS)和E(J-H)/E(H-KS)分别为0.36和1.78。结果与MRN尘埃粒度分布一致。
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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