| 41. | The absorption lines in the optical spectrum show radial velocity variations, although there is significant uncertainty about the period.
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| 42. | A similar approach is used to derive vertical profiles of water vapor utilizing the absorption line at 22.235 GHz.
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| 43. | The mystery object's spectral absorption line for iron was the one part that reminded White of a broad-absorption quasar.
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| 44. | The lines were originally observed as dark features ( absorption lines ) in the optical spectrum of the Sun.
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| 45. | Examination of the spectrographic features of this star showed the characteristic absorption line shift of a binary star system.
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| 46. | Another way astronomers search for dark galaxies is to look for hydrogen absorption lines in the spectra of background quasars.
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| 47. | These traces are the Lyman-alpha forest, a thicket of hydrogen absorption lines seen in spectrographic studies of the quasar light.
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| 48. | Such winds are driven by radiation pressure on the resonance absorption lines of heavy elements such as carbon and nitrogen.
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| 49. | The trouble was with all the atmospheric carbon hiding the absorption lines normally used as temperature indicators for the stars.
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| 50. | The stellar temperature will determine the rate of ionization of various elements, resulting in characteristic absorption lines in the spectrum.
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