3D: The new MPE near-infrared field imaging spectrometer     

L. Weitzel  M. Cameron  S. Drapatz  R. Genzel  A. Krabbe 《Experimental Astronomy》1994,3(1-4):317-318

3D, the next-generation near-IR spectrometer developed at the MPE, produces in a single integration, a datacube of a 8×8 field characterised by 0.5 resolution in image space and a resolving power of R=1000 over the entire K-band in wavelength space.A detailed account of this work, including results of the first test measurements, will be presented elsewhere (Weitzel et al., in preparation).  相似文献   

The supernova trigger for formation of the solar system     

A.G.W. Cameron  J.W. Truran 《Icarus》1977,30(3):447-461

It is suggested that the explosion of a Type II supernova triggered the collapse of a nearby interstellar cloud and led to the formation of the solar system. Estimates of the abundances resulting from nuclear processing of the supernova ejecta are presented. It appears promising that nucleosynthesis in this single supernova event can account for most isotopic anomalies and traces of extinct radioactivities in solar system material.  相似文献   

The heavy element yields of neutron capture nucleosynthesis     

A. G. W. Cameron 《Astrophysics and Space Science》1982,82(1):123-131

An effort has been made to determine the contributions of the S- and R-processes of nucleosynthesis to the abundances of the heavy element isotopes. It has been concluded that the general previous assumption concerning the exclusive assignment of isobars to one or the other of these processes is probably in error. The R-process abundances are characterized by relatively small fluctuations in the abundances of odd and even mass numbers. If this is always true, and such is assumed here, then there are substantial S-process contributions to the abundances of R-process isobars. This is consistent with transient flashing episodes in the S-process neutron production processes. The primary tool for the separation of the abundances due to the two processes therefore had to be achievement of a reasonably smooth and monotonically-decreasing curve of the abundance of the S-process yields times the neutron capture cross-sections versus mass number. Tables of the separate yields are given.  相似文献   

What are hot Jupiters made of?     

Andrew Collier Cameron 《Astronomy& Geophysics》2002,43(4):4.21-4.25

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Gibbons, W., Moreno, M.T. (eds):The geology of Spain     

Cameron S. Rombach 《Mineralium Deposita》2003,38(6):784-785

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Near-infrared spectroscopic search for the close orbiting planet HD 75289b     

J. R. Barnes  C. J. Leigh  H. R. A. Jones  Travis S. Barman  D. J. Pinfield  A. Collier Cameron  J. S. Jenkins 《Monthly notices of the Royal Astronomical Society》2007,379(3):1097-1107

We present a search for the near-infrared spectroscopic signature of the close orbiting extrasolar giant planet HD 75289b. We obtained ∼230 spectra in the wavelength range 2.18–2.19 μm using the Phoenix spectrograph at Gemini South. By considering the direct spectrum, derived from irradiated model atmospheres, we search for the absorption profile signature present in the combined star and planet light. Since the planetary spectrum is separated from the stellar spectrum at most phases, we apply a phase-dependent orbital model and tomographic techniques to search for absorption signatures.
Because the absorption signature lies buried in the noise of a single exposure we apply a multiline deconvolution to the spectral lines available in order to boost the effective signal-to-noise ratio (S/N) of the data. The wavelength coverage of 80 Å is expected to contain ∼100 planetary lines, enabling a mean line with S/N of 800 to be achieved after deconvolution. We are nevertheless unable to detect the presence of the planet in the data and carry out further simulations to show that broader wavelength coverage should enable a planet like HD 75289b to be detected with 99.9 per cent confidence. We investigate the sensitivity of our method and estimate detection tolerances for mismatches between observed and model planetary atmospheres.  相似文献   

Results from the Wide Angle Search for Planets Prototype (WASP0) – III. Planet hunting in the Draco field     

Stephen R. Kane †  rew Collier Cameron  Keith Horne  David James  T. A. Lister  Don L. Pollacco  Rachel A. Street  Yiannis Tsapras 《Monthly notices of the Royal Astronomical Society》2005,364(3):1091-1103

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Starspot distributions on XY UMa during 1997–2000 from eclipse mapping     

T.A. Lister  A. Collier Cameron  R.W. Hilditch 《Monthly notices of the Royal Astronomical Society》2001,326(4):1489-1498

We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998–2000. We also find marginal evidence from the O–C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.  相似文献   

Composition of groundwaters associated with porphyry-Cu deposits, Atacama Desert, Chile: Elemental and isotopic constraints on water sources and water-rock reactions   总被引：1，自引：0，他引：1  

Matthew I. Leybourne  Eion M. Cameron 《Geochimica et cosmochimica acta》2006,70(7):1616-1635

Groundwaters were collected around the Spence porphyry copper deposit, Atacama Desert, northern Chile, to study water-porphyry copper ore bodies interaction and test hypotheses regarding transport of metals through thick overburden leading to the formation of soil geochemical anomalies. The deposit contains 400 Mt of 1% Cu and is completely buried by piedmont gravels of Miocene age. Groundwaters were recovered from the eastern up hydraulic gradient (upflow) margin of the Spence deposit, from within the deposit, and for two kilometers down flow from the deposit. Water table depths decrease from 90 m at the upflow margin to 30 m 1.5 km down flow. Groundwaters at the Spence deposit are compositionally variable with those upflow of the deposit characterized by relatively low salinities (900-7000 mg/L) and Na⁺-SO₄²⁻-type compositions. These waters have compositions and stable isotope values similar to regional groundwaters recovered elsewhere in the Atacama Desert of Northern Chile. In contrast, groundwaters recovered within and down flow of the deposit range in salinity from 10,000 to 55,000 mg/L (one groundwater at 145,000 mg/L) and are dominantly Na⁺-Cl⁻-type waters. Dissolved sulfate values are, however, elevated compared to upflow waters, and δ³⁴S_CDT decreases into the deposit (from >4‰ to 2‰), consistent with increasing influence of sulfur derived from oxidation of sulfide minerals within the deposit. The increase in salinity and conservative tracers (Cl⁻, Br⁻, Li⁺, and Na⁺) and the relationship between oxygen and hydrogen isotopes suggests that in addition to water-rock reactions within the deposit, most of the compositional variation can be explained by groundwater mixing (with perhaps a minor role for evaporation). A groundwater-mixing scenario implies a deeper, more saline groundwater source mixing with the less saline regional groundwater-flow system. Flow of deeper, more saline groundwater along pre-existing structures has important implications for geochemical exploration and metal-transport models.  相似文献   

The pre-main-sequence binary HK Ori: spectro-astrometry and EXPORT data     

D. Baines  R. D. Oudmaijer  A. Mora  C. Eiroa  John M. Porter  B. Merín  B. Montesinos  D. de Winter  A. Cameron  J. K. Davies  H. J. Deeg  R. Ferlet  C. A. Grady  A. W. Harris  M. G. Hoare  K. Horne  S. L. Lumsden  L. F. Miranda  A. Penny  A. Quirrenbach 《Monthly notices of the Royal Astronomical Society》2004,353(2):697-704

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