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An H-alpha survey of southern hemisphere active chromosphere stars
Because of the variety of extraordinary phenomena exhibited by activechromosphere objects, discovery of new, bright surface-active stars isof considerable importance. Ca II emission is a well-known signature ofchromospheric activity, serving even as one of the points of definitionof the class of RS CVn binary stars. In connection with the presentinvestigation, spectroscopic observations of 27 Ca II emission starshave been conducted. The observations make it possible to identifyunambiguously the most chromospherically active stars in the sample. Byobserving the H-alpha line, rather than H and K, it is possible todistinguish nine of these stars which are likely to be observationaltargets as interesting as the extremely surface active objects V711 Tauor FK Com. Of the 27 stars surveyed, two (HD 86005, HD 204128) showedH-alpha as an emission feature above continuum, with estimatedequivalent width 1-2 A.
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Centauro |
| Ascensione retta: | 12h35m18.69s |
| Declinazione: | -52°24'56.1" |
| Magnitudine apparente: | 8.351 |
| Distanza: | 1333.333 parsec |
| Moto proprio RA: | -25.3 |
| Moto proprio Dec: | -9.9 |
| B-T magnitude: | 10.279 |
| V-T magnitude: | 8.511 |
Cataloghi e designazioni:
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