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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.
| An IRAS study of pre-main sequence stars in B209
We have constructed high resolution IRAS maps of the B209 star formingregion in the Taurus complex. By combining survey scans with pointedobservations using advanced techniques specially developed to handleIRAS data in crowded fields, we have constructed images that reveal twonew premain-sequence (PMS) objects. One of these, IRAS 04114+2757G, hasFIR colors close to those of typical T Tauri stars and is probablyassociated with a faint stellar object visible on the POSS prints. Theother new PMS source, IRAS 04111+2800G, is a deeply embedded object notdetected at 12 microns and not optically visible. The object isprojected close to the center of an ammonia core. Our detection ofcompact blue and red shifted (C-12)O emission peaks around the positionof IRAS 04111+2800G confirms the PMS nature and youth of this object. Wehave examined the reasons for the exclusion of IRAS 04111+2800G and IRAS04114+2757G from the IRAS Point Source Catalog and estimated theincompleteness of the currently known sample of embedded PMS stars inTaurus. The implications for the determination of evolutionary timescales in low mass star formation are discussed.
| U, B, V, R, I stellar photometry in the field of the Taurus dark clouds
A program of photoelectric stellar photometry has been carried out inthe field of the Taurus dark clouds with a view to establishing thedistance of the clouds and the absorption law in that region of the sky.It is found that the distance of the dark clouds accompanying the Tau T1and Tau T3 associations is 132 plus or minus 10 pc. Within theabsorption region 0-4 m, the Taurus dark clouds are characterized by anearly normal absorption law (to within 5-10%). In the field of the darkclouds a group of F0-G0 stars close to the main sequence is found whosespace density is three to eight times that in the solar neighborhood.
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Группы:
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Наблюдательные данные и астрометрия
| Созвездие: | Телец |
| Прямое восхождение: | 04h13m03.51s |
| Склонение: | +28°02'25.0" |
| Видимая звёздная величина: | 9.763 |
| Собственное движение RA: | -0.1 |
| Собственное движение Dec: | -9.5 |
| B-T magnitude: | 12.2 |
| V-T magnitude: | 9.965 |
Каталоги и обозначения:
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