Fundamental parameters for M4, the nearest globular cluster
نویسندگان
چکیده
منابع مشابه
Hst Photometry of the Globular Cluster M4
This paper presents a detailed description of the acquisition and processing of a large body of imaging data for three fields in the globular cluster M4 taken with the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. Analysis with the ALLFRAME package yielded the deepest photometry yet obtained for this cluster. The resulting data-set for 4708 stars (positions and calibrated...
متن کاملFluorine Abundance Variations in Red Giants of the Globular Cluster M4 and Early-Cluster Chemical Pollution
We present fluorine abundances in seven red-giant members of the globular cluster M4 (NGC 6121). These abundances were derived from the HF (1–0) R9 line at 2.3357μm in high-resolution infrared spectra obtained with the Phoenix spectrograph on Gemini-South. Many abundances in the target stars have been studied previously, so that their overall abundance distributions are well-mapped. The abundan...
متن کاملOn the Fundamental Plane of the Galactic Globular Cluster System
Context. The globular clusters of our Galaxy have been found to lie close to a plane in the log Re, logσ, SBe space (see Djorgovski 1995), on the continuation of the Fundamental Plane that is known to characterize the global properties of early-type galaxies. Of course, there is no apparent reason why such physically different self-gravitating systems should follow the same scaling law. Aims. W...
متن کاملX-ray Sources and Their Optical Counterparts in the Globular Cluster M4
We report on the Chandra X-ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC6121). We detect 12 X-ray sources inside the core and 19 more within the cluster halfmass radius. The limiting luminosity of this observation is Lx ≈ 10 29 erg s for sources associated with the cluster, the deepest X-ray observation of a globular cluster to date. We identify 6 X-ray so...
متن کاملThe Mildly Metal-poor Globular Cluster M4: Star-to-star Abundance Variations in 20 Giants
Many low-metallicity globular clusters exhibit large star-to-star variations of C, N, O, Na, Mg, & Al abundances. In higher-metallicity clusters, the abundance swings are muted. Evidence of anticorrelations of O versus Na and Mg versus Al exists in classical northern-hemisphere clusters spanning a range of metallicities, –0.8 ≤ [Fe/H] ≤ –2.2. These and other anticorrelations, observed to be a f...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1993
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/265.2.395