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The overlapping open clusters NGC 1750 and NGC 1758. II. $\vec BVR photographic photometry and proper motions
Astrometry (positions and proper motions) and photographic BVRphotometry were determined from a set of 29 photographic plates and CCDdata in a region of 2.3(deg}x2.3({deg)) in the area of open clusters NGC1750 and NGC 1758 in Taurus. The iterative central overlap algorithm wasused for the proper motion calculations. Plate-to-plate transformationsand astrometric magnitude effects are discussed in detail. CCD datainteract with photographic material in three different ways: for theelimination of astrometric magnitude effects, for the photometricstandard calibration of photographic plates and for building a CCDpseudo-plate used for astrometric purposes as any other photographicplate. A preliminary analysis of the resulting photometric andastrometric catalogue confirmed the reality of two different clusters inthe zone (NGC 1750 and NGC 1758). There were no indications for theexistence of NGC 1746. Tables 6 and 11 are only available in electronicform from CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) orvia http://cdsweb.u-strasbg.fr/Abstract.html
| Determination of proper motions and membership of the open clusters NGC 1750 and NGC 1758
The kinematic state of the open clusters NGC 1750 and NGC 1758 has beenstudied using newly determined proper motions for 540 stars in a fieldof 1.5 deg x 1.5 deg in the Taurus dark cloud region. The proper motionsare obtained from the reduction of PDS measurements of 20 plates thatspan a total time interval of 68 years, resulting in an average propermotion accuracy of 0.67 mas/yr. These proper motions are used todetermine the membership probabilities of stars in the region by meansof a new, improved method described in this paper. Of the 540 starsanalyzed here, 332 are found to be probable members of NGC 1750, and 23are probable members of NGC 1758. The core radii of NGC 1750 and NGC1758 are determined to be 17'2 and 2'25 respectively.
| Probable open clusters NGC 1750 and NGC 1758 behind the Taurus dark clouds
The area of 2.5 x 2.5 deg in the direction of the Taurus dark cloudscontaining stellar groupings NGC 1746, NGC 1750, and NGC 1758 isinvestigated in the Vilnius photometric system. Magnitudes V, colorindices, color excesses, interstellar extinctions, and distances aredetermined for 116 stars, some of which are as faint as V = 13. It isconcluded that NGC 1746 is probably not a cluster. Other two groupingsof stars, NGC 1750 and NGC 1758, if real, may be open clusters at 510and 680 pc distances. Interstellar reddenings E(B-V) of both groups are0.42 and 0.37 mag, respectively. The distance of the Taurus dark cloudsin the area is found to be 175 pc, i.e. by 45 pc larger than in otherdirections farther to the south from the galactic equator.
| Red indices in galactic clusters
Not Available
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Наблюдательные данные и астрометрия
| Созвездие: | Телец |
| Прямое восхождение: | 05h04m20.93s |
| Склонение: | +23°31'37.6" |
| Видимая звёздная величина: | 7.578 |
| Собственное движение RA: | -2.3 |
| Собственное движение Dec: | -2.4 |
| B-T magnitude: | 9.835 |
| V-T magnitude: | 7.765 |
Каталоги и обозначения:
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