SpeX: 0.7-5.3 Micron Medium-Resolution Spectrograph and Imager
NASA InfraRed Telescope Facility(IRTF), Institute for Astronomy, University of Hawaii
SpeX Observer Documentation Technical Documentation

The IRTF Spectral Library

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The K Stars

Tar files:
Spectra (FITS)   Spectra (text)   Plots (PNG)

References:
C05: Cushing, M.C., Rayner, J.T, & Vacca, W.D. (2005, ApJ, 623, 1115)
R09: Rayner, J.T., Cushing, M.C., & Vacca, W.D. (2009, ApJS, 185, 289)

Note:
HD 124897 (Arcturus) is too bright to observe without reducing the throughput of SpeX by a factor of ten using an internal moveable cold stop. To achieve very good S/N this stop had to removed when the standard star was observed. This meant that the overall spectral continuum shape was not accurate (since the light path was slightly different for Arcturus and the standard star). Therefore a second set of observations of the standard star was taken with the stop in position to the accurately measure the continuum but with lower overall S/N. Consequently two Arcturus spectra are presented, one with high S/N for absorption line studies, and another with a lower S/N but with accurate measurement of the spectral continuum.

Name Other Name Spectral Type Variability Type [*] Wavelength Range Spectra Plot Unreddened Spectra Plot Reference
HD 165782 AX Sgr K0 Ia SRd 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 44391 K0 Ib 0.81-4.18 μm FITS Text PNG FITS Text PNG R09
HD 179870 K0 II 0.81-5.02 μm FITS Text PNG FITS Text PNG R09
HD 100006 86 Leo K0 III 0.81-4.12 μm FITS Text PNG … … … R09
HD 145675 14 Her K0 V 0.81-4.99 μm FITS Text PNG … … … R09
HD 164349 93 Her K0.5 IIb 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 9852 K0.5 III CN1 0.81-5.00 μm FITS Text PNG FITS Text PNG R09
HD 63302 QY Pup K1 Ia-Iab SRd 0.81-5.06 μm FITS Text PNG FITS Text PNG R09
HD 36134 K1- III Fe-0.5 var 0.81-4.18 μm FITS Text PNG … … … R09
HD 91810 K1- IIIb CN1.5 Ca1 0.81-4.11 μm FITS Text PNG … … … R09
HD 25975 49 Per K1 III 0.81-4.18 μm FITS Text PNG … … … R09
HD 165438 K1 IV 0.81-2.42 μm FITS Text PNG … … … R09
HD 142091 11 CrB K1 IVa 0.81-2.42 μm FITS Text PNG … … … R09
HD 10476 107 Psc K1 V var 0.81-5.00 μm FITS Text PNG … … … R09
HD 124897 Arcturus (shape) K1.5 III Fe-0.5 0.81-5.01 μm FITS Text PNG FITS Text PNG R09
HD 124897 Arcturus (lines) K1.5 III Fe-0.5 0.81-5.02 μm FITS Text PNG FITS Text PNG R09
HD 212466 RW Cep K2 O-Ia SRd 0.80-5.05 μm FITS Text PNG FITS Text PNG R09
HD 2901 K2 III Fe-1 0.81-4.98 μm FITS Text PNG … … … R09
HD 132935 K2 III 0.80-4.94 μm FITS Text PNG FITS Text PNG R09
HD 137759 12 Dra K2 III * 0.81-2.42 μm FITS Text PNG … … … R09
HD 3765 K2 V E: 0.81-5.00 μm FITS Text PNG … … … R09
HD 23082 K2.5 II 0.81-5.01 μm FITS Text PNG FITS Text PNG R09
HD 187238 K3 Iab-Ib 0.81-5.04 μm FITS Text PNG FITS Text PNG R09
HD 16068 K3 II-III 0.81-5.03 μm FITS Text PNG FITS Text PNG R09
HD 221246 K3 III 0.81-4.97 μm FITS Text PNG FITS Text PNG R09
HD 178208 K3 III 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 35620 &phi Aur K3 III Fe1 0.81-4.18 μm FITS Text PNG FITS Text PNG R09
HD 99998 e Leo K3+ III Fe-0.5 0.81-4.12 μm FITS Text PNG FITS Text PNG R09
HD 114960 K3.5 IIIb CN0.5 CH0.5 0.81-4.12 μm FITS Text PNG … … … R09
HD 219134 K3 V * 0.81-4.93 μm FITS Text PNG … … … R09
HD 185622 K4 Ib Lc: 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 201065 K4 Ib-II 0.81-4.08 μm FITS Text PNG FITS Text PNG R09
HD 207991 K4- III 0.81-5.02 μm FITS Text PNG FITS Text PNG R09
HD 45977 K4 V 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 216946 K5 Ib Lc 0.81-4.99 μm FITS Text PNG FITS Text PNG R09
HD 181596 K5 III 0.80-5.00 μm FITS Text PNG … … … R09
HD 36003 K5 V 0.81-5.44 μm FITS Text PNG … … … R09
HD 120477 &upsilon Boo K5.5 III var 0.81-4.12 μm FITS Text PNG … … … R09
HD 3346 K6 IIIa SRs 0.81-2.42 μm FITS Text PNG … … … R09
HD 181475 K7 IIa SRb: 0.81-2.42 μm FITS Text PNG FITS Text PNG R09
HD 194193 K7 III var 0.81-5.03 μm FITS Text PNG … … … R09
HD 237903 36 UMa B K7 V 0.81-4.94 μm FITS Text PNG … … … R09
HD 201092 61 Cyg B K7 V IS 0.81-2.41 μm FITS Text PNG … … … R09