Observation of Centauri
نویسندگان
چکیده
منابع مشابه
A BeppoSAX/LECS X-ray observation of α Centauri
We present the X-ray spectrum of the nearby binary α Cen AB (G2V + K1V) that has been obtained from observations with the low-energy concentrator (LECS) onboard the BeppoSAX X-ray astronomy satellite. SAX combines, in contrast to previous satellites, simultaneous coverage of the 0.1-10 keV energy range with sufficient spectral resolution to determine emission measure distributions and elemental...
متن کاملAn XMM-Newton observation of the globular cluster Omega Centauri
We report on a deep XMM-Newton EPIC observation of the globular cluster Omega Cen performed on August 13th, 2001. We have detected 11 and 27 faint X-ray sources in the core and half mass radii, searching down to a luminosity of 1.3 ×10 ergs s in the 0.5-5 keV range. Most sources have bolometric X-ray luminosities between ∼ 10 −10ergs s. We present the color-color and hardness-intensity diagrams...
متن کاملRevised masses of α Centauri
With the precise radial velocities lately published (Murdoch et al., 1993), a simultaneous least-squares adjustment of all visual and spectroscopic observations of the α Centauri system is now possible and likely to yield some accurate information. Such an orbit determination leads to a mass ratio in agreement with the astrometric estimate of Kamper & Wesselink (1978) but yields upward revision...
متن کاملThe Luminosity Function of Omega Centauri
Deep HST–WFPC2 observations of the stellar population in the globular cluster ωCen (NGC5139) have been used to measure the luminosity function of main sequence stars at the low-mass end. Two fields have been investigated, located respectively ∼ 4 . 6 and ∼ 7 away from the cluster center, or near the half-light radius of this cluster (rhl ≃ 4 ′ . 8). The color-magnitude diagrams derived from the...
متن کاملPossibilities of life around Alpha Centauri B
We make a preliminary assessment on the habitability of potential rocky exoplanets around Alpha Centauri B. We use several indexes: the Earth Similarity Index, a mathematical model for photosynthesis, and a biological productivity model. Considering the atmospheres of the exoplanets similar to current Earth’s atmosphere, we find consistent predictions of both the Earth Similarity Index and the ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1856
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/17.1.19