منابع مشابه
Red-giant collisions in the galactic centre
We simulate collisions involving red-giant stars in the centre of our galaxy. Such encounters may explain the observed paucity of highly luminous red giants within ∼ 0.2 pc of Sgr A⋆. The masses of the missing stars are likely to be in the range ∼ 2M⊙ − 8M⊙. Recent models of the galactic centre cluster’s density distribution and velocity dispersion are used to calculate two-body collision rates...
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The first image of a Cosmic Web, Lyman Limit System has just been made in HI emission within the Local Group filament connecting M31 and M33. The corresponding HI distribution function is in very good agreement with that of the QSO absorption lines, confirming the 30-fold increase in surface area expected between 10 cm and 10 cm. The critical observational challenge is crossing the “HI desert”,...
متن کاملModelling the Galactic Bar Using Red Clump Giants
The color-magnitude diagrams of ∼ 7×105 stars obtained for 12 fields across the Galactic bulge with the OGLE project reveal a well-defined population of bulge red clump giants. We find that the distributions of the apparent magnitudes of the red clump stars are systematically fainter when moving towards lower galactic l fields. The most plausible explanation of this distinct trend is that the G...
متن کاملConstraining the Galactic Bar Parameters with Red Clump Giants
Red clump giants in the Galactic bulge occupy a distinct region in the colour magnitude diagram. They have a very small spread in intrinsic luminosities and their number counts have a well defined peak. We show that these characteristics can be used to constrain the differences in the streaming motions of stars on the near side and those on the far side. We propose two methods to select two sam...
متن کاملRed clump distances to the inner Galactic structures
The least well known structure of the Galaxy is its central region, because of the high extinction, the crowding and the confusion between disk and bulge sources along the line of sight. We show how the structure of the inner Galaxy and the dust distribution can be strongly constrained by using red clump stars as distance indicator. The results of this method applied on the deep near-infrared s...
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ژورنال
عنوان ژورنال: Nature
سال: 1961
ISSN: 0028-0836,1476-4687
DOI: 10.1038/192858a0