File:White.Dwarfs.Spectra.ESO.9953b.png
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Size of this preview: 476 × 599 pixels. Other resolutions: 190 × 240 pixels | 381 × 480 pixels | 764 × 962 pixels.
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DescriptionWhite.Dwarfs.Spectra.ESO.9953b.png |
English: This chart displays the spectra of four white dwarf stars in globular cluster NGC 6397, obtained with ANTU/FORS1 and identified as such from these data. The spectra were shifted vertically so that they do not overlap. The wavelength is indicated along the abscissa; the intensity along the ordinate. A "standard" spectrum of a white dwarf star (of spectral type DA — the hydrogen-rich variety) is shown at the top for comparison. Broad absorption lines from hydrogen atoms in the atmosphere are visible. Although the signal-to-noise ratio is quite small, especially for the lower spectra of the fainter stars, they all show the same strong, broad absorption lines as the comparison spectrum. This permits to classify them unambiguously as WD stars. Individual differences, for instance of the widths of the absorption lines, are clearly present and point to different surface gravity and masses.
Русский: Спектры белых карликов в шаровом скоплении NGC 6397. «Стандартный» спектр белого карлика спектрального класса DA выделен красным. |
Date | |
Source | Spectrum of white dwarf stars in NGC 6397 (TIFF) |
Author | European Southern Observatory |
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution 4.0 International license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:25, 8 September 2017 | 764 × 962 (391 KB) | Mikhail Ryazanov (talk | contribs) | == {{int:filedesc}} == {{Information |Description={{en|1=This chart displays the spectra of four White Dwarf stars in globular cluster NGC 6397, obtained with ANTU/FORS1 and identified as such from these data. The spectra were shifted vertically so tha... |
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Horizontal resolution | 118.11 dpc |
Vertical resolution | 118.11 dpc |
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