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HD 10986


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1-1.4 Micron Spectral Atlas of Stars
We present a catalog of J-band (1.08 to 1.35 μm) stellar spectra atlow resolution (R~400). The targets consist of 105 stars ranging inspectral type from O9.5 to M7 and luminosity classes I through V. Therelatively featureless spectra of hot stars, earlier than A4, can beused to remove the atmospheric features which dominate ground-basedJ-band spectroscopy. We measure equivalent widths for three absorptionlines and nine blended features which we identify in the spectra. Usingdetailed comparison with higher resolution spectra, we demonstrate thatlow-resolution data can be used for stellar classification, sinceseveral features depend on the effective temperature and gravity. Forexample, the CN index (1.096-1.104 μm) decreases with temperature,but the strength of a blended feature at 1.28 μm (consisting ofprimarily Pβ) increases. The slope of a star's spectrum can also beused to estimate its effective temperature. The luminosity class of astar correlates with the ratio of the Mg I (1.1831 μm) line to ablend of several species at 1.16 μm. Using these indicators, a starcan be classified to within several subclasses. Fifteen stars withparticularly high and low metal abundances are included in the catalog,and some spectral dependence on metal abundance is also found.

Proper motion of the star LP 768-500 in Cetus
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观测天体数据

星座:鯨魚座
右阿森松:01h47m38.20s
赤纬:-17°13'05.2"
视星:8.098
距离:787.402 天文距离
右阿森松适当运动:30.7
赤纬适当运动:2.5
B-T magnitude:10.087
V-T magnitude:8.263

目录:
适当名称   (Edit)
HD 1989HD 10986
TYCHO-2 2000TYC 5855-1209-1
USNO-A2.0USNO-A2 0675-00635771
HIPHIP 8345

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