Long period variables in the globular cluster 47 Tuc: Radial velocity variations
نویسندگان
چکیده
منابع مشابه
Photometry of the Globular Cluster 47 Tuc
We present BV I photometry for about 16000 stars from a 220 arcmin field centered 8 arcmin east of the center of 47 Tuc. We have identified eight likely blue stragglers located in the outer parts of the cluster. Four of these objects are easy targets for spectroscopic studies with ground-based telescopes. Six candidates for blue horizontal branch stars were identified. However, it is possible t...
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We present preliminary results from a FUV spectroscopic and photometric survey of the globular cluster 47 Tuc. Our main goal is to either confirm or rule out the existence of a large population of CVs in the core of this cluster. We have so far identified approximately 425 FUV sources, most of which are probably hot, young WDs. However, we have also found approximately 30 FUV sources whose posi...
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Age constraints are most often placed on globular clusters by comparing their CMDs with theoretical isochrones. The recent discoveries of detached, eclipsing binaries in such systems by the Cluster AgeS Experiment (CASE) provide new insights into their ages and, at the same time, much needed tests of stellar evolution models. We describe efforts to model the properties of the detached, eclipsin...
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We exploit the large number of archival HST images of 47 Tuc to examine its subgiant branch (SGB) and main sequence (MS) for signs of multiple populations. In the cluster core, we find that the cluster's SGB exhibits a clear spread in luminosity, with at least two distinct components: a brighter one with a spread that is real but not bimodal, and a second one about 0.05 mag fainter, containing ...
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We describe the detailed chemical abundance analysis of a high-resolution (R∼30,000), integrated-light (IL), spectrum of the core of the Galactic globular cluster (GC) 47 Tuc. This is the first paper in a series in which we develop and demonstrate a method for measuring detailed abundances in spatial unresolved extragalactic GCs. The echelle spectra were taken with the du Pont telescope at Las ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20047164