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First Astronomical Application of a Cryogenic Transition Edge Sensor Spectrophotometer
We report on the first astronomical observations with a photon-countingpixel detector that provides arrival time (deltat=100 ns) and energy(deltaE_gamma<=0.15 eV) resolved measurements from the near-IRthrough the near UV. Our test observations were performed by couplingthis transition edge sensor device to a 0.6 m telescope; we haveobtained the first simultaneous optical near-IR phase-resolved spectraof the Crab pulsar. A varying infrared turnover gives evidence ofself-absorption in the pulsar plasma. The potential of such detectors inimaging arrays from a space platform is briefly described.
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
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Osservazione e dati astrometrici
| Costellazione: | Toro |
| Ascensione retta: | 04h30m18.74s |
| Declinazione: | +21°22'56.8" |
| Magnitudine apparente: | 10.288 |
| Moto proprio RA: | 16.3 |
| Moto proprio Dec: | -10.9 |
| B-T magnitude: | 11.168 |
| V-T magnitude: | 10.361 |
Cataloghi e designazioni:
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