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Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
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Voyager ultraviolet spectrometer observations of the subdwarf B or OBstars HD 205805, UV 1758+36 and Feige 66 are presented. All threeobjects display the H I Layman series in absorption. These observationsare combined with low dispersion IUE spectrophotometry and withStromgren photometry to construct virtually complete energydistributions, which extend over the range 950-5500 angstroms. Effectivetemperatures based on model atmosphere calculations for high gravity,hygrogen rich stars are determined. Our analyses yield Te28,200 + or - 1300 K for HD 205805, Te 31, 800 + or - 1100 Kfor UV 1758+36, and Te 35,700 + or 1500 K for Feige 66. Theimportance of far ultraviolet observations below Lalpha inreducing the uncertainties associated with the interstellar extinctionand the degradation of the IUE sensitivity is emphasized.
| Spectral types for early-type stars observed by SKYLAB
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Osservazione e dati astrometrici
| Costellazione: | Cigno |
| Ascensione retta: | 21h36m13.33s |
| Declinazione: | +50°40'44.7" |
| Magnitudine apparente: | 7.238 |
| Distanza: | 606.061 parsec |
| Moto proprio RA: | 2.6 |
| Moto proprio Dec: | -3.1 |
| B-T magnitude: | 7.14 |
| V-T magnitude: | 7.23 |
Cataloghi e designazioni:
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