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Subaru Near Infrared Coronagraphic Images of T Tauri
High angular resolution near-infrared (JHK) adaptive optics images of TTau were obtained with the infrared camera Coronagraphic Imager withAdaptive Optics (CIAO) mounted on the 8.2m Subaru Telescope in 2002 and2004. The images resolve a complex circumstellar structure around amultiple system. We resolved T Tau Sa and Sb as well as T Tau N and S.The estimated orbit of T Tau Sb indicates that it is probably bound to TTau Sa. The K band flux of T Tau S decreased by 1.7 Jy in 2002November compared with that in 2001 mainly because T Tau Sa becamefainter. The arc-like ridge detected in our near-infrared images isconsistent with what is seen at visible wavelengths, supporting theinterpretation in previous studies that the arc is part of the cavitywall seen relatively pole-on. Halo emission is detected out to2''from T Tau N. This may be light scattered off the commonenvelope surrounding the T Tauri multiple system.
| 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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Boga |
| Sað Açýklýk: | 04h29m58.95s |
| Yükselim: | +13°09'20.0" |
| Görünürdeki Parlaklýk: | 9.483 |
| özdevim Sað Açýklýk: | 11.4 |
| özdevim Yükselim: | -8.8 |
| B-T magnitude: | 10.048 |
| V-T magnitude: | 9.53 |
Kataloglar ve belirtme:
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