منابع مشابه
Ccd Photometry of Distant Open Clusters: Ii { Ngc 6791
Three new photometric CCD-based datasets are presented for NGC 6791. They consist of deep UBV photometry (to V lim = 24, B lim = 24, U lim = 23) of the central parts of the cluster and of selected elds around it, and of relatively shallower UBVI photometry for the whole cluster (23 0 23 0). The data have been used to discuss the reddening, metallicity and age of NGC 6791, a cluster which is par...
متن کاملCCD photometry of young MC clusters I : NGC 2172 ?
We present a new CCD photometry for the young LMC cluster NGC 2172, giving B, V, I magnitudes for more than 600 stars within 70 ′′ from the cluster center, down to approximatelyV = 21 mag. After correction for completeness and field stars contamination, we discuss the cluster HR diagram and the MS luminosity function in the light of current evolutionary theories and in connection with the probl...
متن کاملUBVRI CCD photometry of the old open cluster NGC 6253 ⋆
We present UBVRI photometry for the old open cluster NGC 6253. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we derive in a self consistent way reddening, distance, and age of the cluster: E(B−V)= 0.23–0.32, (m-M)0 = 10.9±0.1, metallicity roughly double than solar, and age ≃ 3 Gyr. The cluster has a binary sequence, discernible e...
متن کاملCCD photometry of two old open clusters NGC 1798 and NGC 2192
We present UBV I CCD photometry of two open clusters NGC 1798 and NGC 2192 which were little studied before. Color-magnitude diagrams of these clusters show several features typical for old open clusters: a well-defined main-sequence, a red giant clump, and a small number of red giants. The main sequence of NGC 1798 shows a distinct gap at V ≈ 16.2 mag. From the surface number density distribut...
متن کاملCCD photometry of distant comets
While it is apparent that many comets are active beyond the canonical distance of 3 AU, few surveys of cometary activity have been performed in this region previously. Such a survey enables a more accurate determination of the proportion of comets that exhibit little or no outgassing at these distances. Results are presented of CCD observations of comets in the region of 3 AU ≤ Rh ≤ 6 AU obtain...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1993
ISSN: 0074-1809
DOI: 10.1017/s0074180900170445