![]() We find 8239 isolated lines between 5 nm that we attribute to U, 3379 of which were not contained in earlier line lists.Ĭonclusions. We find differences (up to 88%) in the line intensity of U lines in different lamps from the same batch. The filling gas of the lamps significantly affects their performance because Ar and Ne lines contaminate different spectral regions. Uranium lamps show more lines suitable for calibration than Th lamps from 500 to 1000 nm. We record high resolution spectra of different HCLs using a Fourier transform spectrograph: (i) U–Ne, U–Ar, Th–Ne, and Th–Ar lamps in the spectral range from 500 to 1000 nm and U–Ne and U–Ar from 1000 to 1700 nm (ii) we systematically compare the number of emission lines and the line intensity ratio for a set of 12 U–Ne HCLs and (iii) we record a master spectrum of U–Ne to create a new U line list. We aim to determine the most suitable combination of elements (Th or U, Ar or Ne) for wavelength calibration of astronomical spectrographs, to characterize differences between similar HCLs, and to provide a new U line list. Thorium hollow cathode lamps (HCLs) are used as frequency calibrators for many high resolution astronomical spectrographs, some of which aim for Doppler precision at the 1 m s −1 level.Īims. Wolter 4ġ Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyĮ-mail: Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germanyģ Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, SpainĤ Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029Ĭontext. Astronomical objects: linking to databases. ![]() ![]() Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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