DEEPHUBBLE SPACE TELESCOPEIMAGING IN NGC 6397: STELLAR DYNAMICS
نویسندگان
چکیده
منابع مشابه
Photometry of Variable Stars in the Globular Cluster NGC 6397
Time series BV I photometry is presented for 16 short-period variables located in the central region of the globular cluster NGC 6397. The sample includes 9 newly detected variables. The light curve of cataclysmic variable CV6 shows variability with a period of 0.2356 days. We confirm an earlier reported period of 0.472 days for cataclysmic variable CV1. Phased light curves of both CVs exhibit ...
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The millisecond pulsars discovered in globular clusters are diagnostic tools for studying the dynamics of the clusters, the intracluster ionized gas and the evolution of the binaries embedded in the cluster. In the first two years of a search at 1.4 GHz in progress at the Parkes radio telescope 12 new millisecond pulsars have been discovered in 6 globular clusters in which no pulsars were previ...
متن کاملThe red stellar population in NGC 1569
Agency ABSTRACT We present HST NICMOS photometry of the resolved stellar population in the dwarf irregular galaxy NGC 1569. The color-magnitude diagram (CMD) in the F110W and F160W photometric bands contains ∼2400 stars with a formal photometric error ∼ < 0.1 mag down to m F110W ≈ 23.5 and m F160W ≈ 22.5. The fiducial photometry has a completeness factor higher than 50% down to m F110W ≈ 21.5 a...
متن کاملAbundances of C , N , O in slightly evolved stars in the globular clusters NGC 6397 , NGC 6752 and 47 Tuc ⋆
Abundances of C and N are derived from features due to the CH G-band and to the UV CN band measured on high resolution (R ∼ > 40, 000) UVES spectra of more than 40 dwarfs and subgiants in NGC 6397, NGC 6752 and 47 Tuc. Oxygen abundances (or upper limits) are available for all stars in the sample. Isotopic ratios 12 C/ 13 C were derived from the CH molecular band. This is the first determination...
متن کاملOn the stellar populations in NGC 185 and NGC 205 , and the nuclear star cluster in NGC 205 from Hubble Space Telescope 1 observations
We present the first detailed analysis of resolved stellar populations in the dwarf galaxies NGC 185 and NGC 205 based on archival V-and I-band WFPC2 pointings. For NGC 185 we deduce from the brightest main sequence and blue loop stars that star formation was probably still active about 4×10 8 yr ago; and have three key abundance-related results: (1) We identify ancient stars with [Fe/H]-1.5 de...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/761/1/51