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Intermediate-Brightness Spectrophotometric Standards. Standards Near +40° Declination The second stage in our program to compile a list of regionalintermediate-brightness spectrophotometric standards has been completed.We have obtained spectral energy distributions for 24 stars withmagnitudes near +40° declination. The range λλ31007600 Å was studied with a spectral resolution of 50 Å. Therelative rms error of our results in the visible is 1 2%, increasing to3 5% toward the edges of the studied wavelength interval. All the starsare referenced to a single standard, the circumpolar star HD 221525. Theenergy distributions were used to compute color indices in the UBV,WBVR, and UPXY ZV S systems, as well as in the system of the TYCHOcatalog. The computed and observed values for stars in common with theTYCHO catalog are compared.
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| Radial velocity measurements. I - Ground-based observations of the program stars for the HIPPARCOS satellite The radial velocities of 272 stars brighter than m(pg) = 8.5 aredetermined by digital microphotometric measurement of plates obtainedwith dispersion 80 A/mm using the Marly slit spectrograph on the 120-cmtelescope of the Observatoire de Haute Provence. The objects wereselected as probable members of the input catalog for the ESA Hipparcosastrometric satellite. The measurement techniques and data-reductionprocedures are described in detail, and the results are presented inextensive tables and graphs and briefly characterized.
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Osservazione e dati astrometrici
Costellazione: | Perseo |
Ascensione retta: | 04h26m42.57s |
Declinazione: | +41°07'22.9" |
Magnitudine apparente: | 8.041 |
Distanza: | 165.289 parsec |
Moto proprio RA: | -4.9 |
Moto proprio Dec: | -18.1 |
B-T magnitude: | 8.184 |
V-T magnitude: | 8.053 |
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