First results from the Goddard High-Resolution Spectrograph - The chromosphere of Alpha Tauri
The K5 III star Alpha Tau was observed with the Goddard High Resolution Spectrograph on November 27, 1990 as part of the Science Assessment Program for the HST. The spectra show intersystem and permitted chromospheric emission lines of semiforbidden C II and Si II, Fe II, Fe I, Ni II, and Co II. Res...
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| Veröffentlicht in: | The Astrophysical journal 1991-08, Vol.377, p.L45 |
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| container_start_page | L45 |
| container_title | The Astrophysical journal |
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| creator | Carpenter, Kenneth G. Robinson, Richard D. Wahlgren, Glenn M. Ake, Thomas B. Ebbets, Dennis C. |
| description | The K5 III star Alpha Tau was observed with the Goddard High Resolution Spectrograph on November 27, 1990 as part of the Science Assessment Program for the HST. The spectra show intersystem and permitted chromospheric emission lines of semiforbidden C II and Si II, Fe II, Fe I, Ni II, and Co II. Resolved profiles of the semiforbidden C II lines indicate a complex chromospheric turbulent velocity distribution with mean value of roughly 24 km/s, while their observed wavelengths indicate a 4 km/s downflow of the semiforbidden C II plasma. Twenty-five new emission lines have been found in the 2320-2370 A region, 17 of which have been identified with the aid of Skylab data obtained above the solar limb, including four lines from Co II (UV 8) and an Fe I (UV 12) line. |
| doi_str_mv | 10.1086/186113 |
| format | Article |
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The spectra show intersystem and permitted chromospheric emission lines of semiforbidden C II and Si II, Fe II, Fe I, Ni II, and Co II. Resolved profiles of the semiforbidden C II lines indicate a complex chromospheric turbulent velocity distribution with mean value of roughly 24 km/s, while their observed wavelengths indicate a 4 km/s downflow of the semiforbidden C II plasma. Twenty-five new emission lines have been found in the 2320-2370 A region, 17 of which have been identified with the aid of Skylab data obtained above the solar limb, including four lines from Co II (UV 8) and an Fe I (UV 12) line.</abstract><cop>Legacy CDMS</cop><doi>10.1086/186113</doi><oa>free_for_read</oa></addata></record> |
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| ispartof | The Astrophysical journal, 1991-08, Vol.377, p.L45 |
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| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources Astrophysics ATMOSPHERES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS EMISSION SPECTRA GIANT STARS RESOLUTION SATELLITES SPECTRA STARS STELLAR ATMOSPHERES STELLAR CHROMOSPHERES TELESCOPES TURBULENCE ULTRAVIOLET SPECTRA |
| title | First results from the Goddard High-Resolution Spectrograph - The chromosphere of Alpha Tauri |
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