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J/AJ/153/84 Low-resolution near-infrared stellar spectra from CIBER (Kim+, 2017)

Low-resolution near-infrared stellar spectra observed by the Cosmic Infrared Background Experiment (CIBER). Kim M.G., Lee H.M., Arai T., Bock J., Cooray A., Jeong W.-S., Kim S.J., Korngut P., Lanz A., Lee D.H., Lee M.G., Matsumoto T., Matsuura S., Nam U.W., Onishi Y., Shirahata M., Smidt J., Tsumura K., Yamamura I., Zemcov M. <Astron. J., 153, 84-84 (2017)> =2017AJ....153...84K (SIMBAD/NED BibCode)
ADC_Keywords: Spectra, infrared ; Stars, bright ; Spectral types ; Spectroscopy Keywords: catalogs - infrared: stars - stars: general - techniques: spectroscopic Abstract: We present near-infrared (0.8-1.8µm) spectra of 105 bright (mJ<10) stars observed with the low-resolution spectrometer on the rocket-borne Cosmic Infrared Background Experiment. As our observations are performed above the Earth's atmosphere, our spectra are free from telluric contamination, which makes them a unique resource for near-infrared spectral calibration. Two-Micron All-Sky Survey photometry information is used to identify cross-matched stars after reduction and extraction of the spectra. We identify the spectral types of the observed stars by comparing them with spectral templates from the Infrared Telescope Facility library. All the observed spectra are consistent with late F to M stellar spectral types, and we identify various infrared absorption lines. Description: We present flux-calibrated near-infrared spectra of 105 stars from 0.8≤λ≤1.8µm with spectral resolution 15≤λ/Δλ≤30 over the range. The Low-Resolution Spectrometer (LRS) is one of the four optical instruments of the Cosmic Infrared Background Experiment (CIBER) payload; the others are a narrowband spectrometer and two wide-field imagers. The LRS is a prism-dispersed spectrometer with five rectangular 5.35°*2.8' slits imaging a 5.8°*5.8° field of view. The detector has 256*256 pixels at a pixel scale of 1.36'*1.36'. CIBER has flown four times (2009 February, 2010 July, 2012 March, and 2013 June) with apogees and total exposure times of over 325km and ∼240s, respectively, in the first three flights and of 550km and 335s in the final, non-recovered flight. Due to spurious signal contamination from thermal emission from the shock-heated rocket skin, we do not use the first flight data in this work. The star spectral types are determined by fitting known spectral templates to the measured LRS spectra. We use the Infrared Telescope Facility (IRTF) and Pickles 1998 (Cat. J/PASP/110/863) templates for the SED fitting. The SpeX instrument installed on the IRTF observed stars using a medium-resolution spectrograph (R=2000). The template library contains spectra for 210 cool stars (F to M type) with wavelength coverage from 0.8 to 2.5µm (Cushing 2005ApJ...623.1115C; Rayner 2009ApJS..185..289R). The Pickles library is a synthetic spectral library that combines spectral data from various observations to achieve wavelength coverage from the UV (0.115µm) to the near-infrared (2.5µm). It contains 131 spectral templates for all star types (i.e., O to M type) with a uniform sampling interval of 5Å. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 36 11 *Rocket-commanded coordinates for the observed field table2.dat 29 3 Number of stars rejected at each criterion table3.dat 141 110 Star catalog spectra/* 80 110 Low-Resolution Spectrometer (LRS) spectra hrspex/* 40 110 High-resolution SpeX spectra lrspex/* 80 110 Low-resolution SpeX spectra
Note on table1.dat: Arabic numbers after the Hyphen for the Elat fields indicate the flight number.
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998) http://astro.snu.ac.kr/~mgkim/project/ciber/index.html : CIBER Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Field Field name 9 I1 --- Flight ? Flight number 11- 12 I2 h RAh Hour of Right Ascension (J2000) 14- 15 I2 min RAm Minute of Right Ascension (J2000) 17- 22 F6.3 s RAs [0/60] Second of Right Ascension (J2000) 24 A1 --- DE- Sign of the Declination (J2000) 25- 26 I2 deg DEd Degree of Declination (J2000) 28- 29 I2 arcmin DEm Arcminute of Declination (J2000) 31- 36 F6.3 arcsec DEs Arcsecond of Declination (J2000)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Flight Flight 5- 10 A6 --- --- [flight] 12- 14 I3 --- Nc Total number of candidates 16- 17 I2 --- i Number of candidate stars rejected at criterion (i) (1) 19- 20 I2 --- ii Number of candidate stars rejected at criterion (ii) (2) 22 I1 --- iii Number of candidate stars rejected at criterion (iii) (3) 24- 26 I3 --- iv Number of candidate stars rejected at criterion (iv) (4) 28- 29 I2 --- Ns Total number of stars in final catalog
Note (1): Each candidate must have J<11. Note (2): The J-band magnitude difference between the Low-Resolution Spectrometer (LRS) candidate and the matched 2MASS counterpart must be <1.5. Note (3): The J-H color difference between the Low-Resolution Spectrometer (LRS) candidate star and the matched 2MASS counterpart must be <0.3. Note (4): Among the candidate 2MASS counterparts within the 500'' (=6 pixel) radius of a given Low-Resolution Spectrometer (LRS) star, the second-brightest 2MASS star must be fainter than the brightest one by more than 2mag at the J-band.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Flight Flight (either 2nd, 3rd, or 4th) 5- 11 A7 --- Field Field name 13- 18 A6 --- Star Star identifier 20 A1 --- f_Star [e] Flag 'e' for a star observed from two independent flights 22- 35 A14 --- Name Star name 37- 38 I2 h RAh Hour of Right Ascension (J2000) (1) 40- 41 I2 min RAm Minute of Right Ascension (J2000) (1) 43- 48 F6.3 s RAs Second of Right Ascension (J2000) (1) 50 A1 --- DE- Sign of the Declination (J2000) (1) 51- 52 I2 deg DEd Degree of Declination (J2000) (1) 54- 55 I2 arcmin DEm Arcminute of Declination (J2000) (1) 57- 62 F6.3 arcsec DEs Arcsecond of Declination (J2000) (1) 64- 69 F6.3 mag Jmag1 [6.5/11] Low-Resolution Spectrometer (LRS) Vega J-band magnitude (2) 71- 76 F6.3 mag Hmag1 [5.7/10.7] Low-Resolution Spectrometer (LRS) Vega H-band magnitude (2) 78- 83 F6.3 mag Jmag2 [5.7/10.6] 2MASS Vega J-band magnitude (3) 85- 90 F6.3 mag Hmag2 [5/10.1] 2MASS Vega H-band magnitude (3) 92- 96 A5 --- SpT1 SIMBAD spectral type 98-114 A17 --- SpT2 Best-fit Infrared Telescope Facility (IRTF) spectral type (4) 116-120 F5.3 --- chi2 [0.03/4.6] Χ2 122-141 A20 --- Note Note
Note (1): The J2000.0 right ascension and declination of a star in a sexagesimal from 2MASS data. Note (2): From the spectra, we can compute synthetic magnitudes in the J- and H-bands, which facilitate comparison to Two-Micron All-Sky Survey (2MASS; see Cutri et al. 2003, Cat. II/246) measurements. We first convert surface brightness in nW/m2/sr to flux in nW/m2/Hz and then integrate the monochromatic intensity over the 2MASS band, applying the filter transmissivity of the J- and H-bands (Cohen et al. 2003AJ....126.1090C). To determine the appropriate zero magnitude, we integrate the J- and H-band intensity of Vega's spectrum (Bohlin & Gilliland 2004AJ....127.3508B) with the same filter response. The J- and H-band magnitudes of each source are then calculated. Note (3): Vega magnitude of the matched 2MASS point source catalog (Cutri et al. 2003, Cat. II/246). Note (4): The star spectral types are determined by fitting known spectral templates to the measured LRS spectra. We use the Infrared Telescope Facility (IRTF) and Pickles 1998 (Cat. J/PASP/110/863) templates for the SED fitting. See Section 4.1 in the paper for further details.
Byte-by-byte Description of file: spectra/*,lrspex/*
Bytes Format Units Label Explanations
9- 20 F12.10 um lambda Wavelength λ 29- 40 F12.10 --- Flux J-band-normalized observed Low-Resolution Spectrometer (LRS) flux (1) 48- 60 F13.10 --- b_Flux Lower value of the flux interval 69- 80 F12.10 --- B_Flux Upper value of the flux interval
Note (1): λfλfλ(J-band).
Byte-by-byte Description of file: hrspex/*
Bytes Format Units Label Explanations
9- 20 F12.10 um lambda Wavelength λ 29- 40 F12.10 --- Flux Flux
History: From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 23-Jun-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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