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Публикации по объекту
Near-Infrared, Adaptive Optics Observations of the T Tauri Multiple-Star System
With high angular resolution, near-infrared observations of the youngstellar object T Tauri at the end of 2002, we show that, contrary toprevious reports, none of the three infrared components of T Tau seem tocoincide with the compact radio source that has apparently been ejectedrecently from the system (Loinard, Rodríguez, &Rodríguez). The compact radio source and the infrared object ithas previously been identified with, T Tau Sb, have distinct paths thatdeparted from orbital or uniform motion between 1997 and 2000, perhapsindicating that their interaction led to the ejection of the radiosource. The path that T Tau Sb took between 1997 and 2003 may indicatethat this star is still bound to the presumably more massive southerncomponent, T Tau Sa. The radio source (if indeed distinct from T Tau Sb)is absent from our near-infrared images and must therefore be fainterthan K=10.2 (if located within 100 mas of T Tau Sb, as the radio datawould imply), still consistent with an identity as a low-mass star orsubstellar object.
| 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.
| A catalogue of visual extinction in Taurus and Perseus
A catalog containing high angular resolution data on visual extinctionin Taurus and Perseus has been compiled from star counts on the printsof the Palomar Observatory Sky Survey. This catalog may serve as afinding list for infrared and radio molecular searches of protostellarobjects and high density regions. It could be used as a statisticalsource of data for fragmentation and physical properties studies of darkclouds. The star counts procedure is discussed.
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Телец |
| Прямое восхождение: | 04h09m48.15s |
| Склонение: | +27°24'10.4" |
| Видимая звёздная величина: | 9.494 |
| Собственное движение RA: | 4.1 |
| Собственное движение Dec: | -10.1 |
| B-T magnitude: | 11.174 |
| V-T magnitude: | 9.633 |
Каталоги и обозначения:
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