A LABORATORY log( gf ) MEASUREMENT OF THE Ti II 15873.84 Å H -BAND LINE IN SUPPORT OF SDSS-III APOGEE

The SDSS-III APOGEE collaboration has identified a single useable line in the H-band spectra of APOGEE target stars arising from a singly ionized species. This line of Ti II ([lambda] sub(air) = 15873.84 A) is therefore of great importance for use in stellar surface gravity, or log(g), determination...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2014-06, Vol.787 (2), p.1-4, Article L16
Main Authors: Wood, M P, Lawler, J E, Shetrone, M D
Format: Article
Language:English
Subjects:
Apogees
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Calibration
EMISSION SPECTRA
FOURIER TRANSFORMATION
GRAVITATION
INFRARED SPECTRA
PROBABILITY
SAHA EQUATION
Saha equations
Spectra
STARS
Strength
SURFACES
Titanium
TITANIUM IONS
Transition probabilities
WATER CURRENTS
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Summary:The SDSS-III APOGEE collaboration has identified a single useable line in the H-band spectra of APOGEE target stars arising from a singly ionized species. This line of Ti II ([lambda] sub(air) = 15873.84 A) is therefore of great importance for use in stellar surface gravity, or log(g), determinations via the Saha equation. While a theoretical estimate of the line strength exists, to date no laboratory measurement of the line strength has been reported. Herein we report an absolute laboratory transition probability measurement for this important Ti II line. A relative line strength measurement is made of the Ti II H-band line of interest and a reference line with a previously reported absolute transition probability. This ratio is measured using multiple spectra of a high-current water-cooled HC lamp recorded with a calibrated FT-IR spectrometer.
ISSN:0004-637X
2041-8205
1538-4357
2041-8213
DOI:10.1088/2041-8205/787/2/L16