Results 71 to 80 of about 4,112,115 (294)
, 2006 I present a selection of results obtained from VLT FORS1 and ISAAC photometric monitoring of late-type giants in NGC 5128 (=Centaurus A). The combination of optical and near-IR photometry allows to probe the full metallicity range of the stars on the upper red giant branch, thanks to combined low-metallicity sensitivity of the optical and high ...
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Observations of Lithium in red giant stars [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractConnections between observations of the lithium abundance in various types of red giants and stellar evolution are discussed here. The emphasis is on three main topics; 1) the depletion of Li as stars ascend the red giant branch for the first time, 2) the synthesis of 7Li in luminous and massive asymptotic giant branch stars via the mechanism ...
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Kinematics of Tycho-2 red giant clump stars [PDF]
Astronomy Letters, 2009 Based on the Ogorodnikov-Milne model, we analyze the proper motions of 95 633 red giant clump (RGC) stars from the Tycho-2 Catalogue. The following Oort constants have been found: A = 15.9+-0.2 km/s/kpc and B = -12.0+-0.2 km/s/kpc. Using 3632 RGC stars with known proper motions, radial velocities, and photometric distances, we show that, apart from the
Bobylev, V. V. +3 more
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The ‘Giraffe’: discovery of a stripped red giant in an interacting binary with an ∼2 M⊙ lower giant
, 2022 We report the discovery of a stripped giant + lower giant Algol-type binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object – star binaries. 2M0412 is an evolved (Teff, giant ≃ 4000 K), luminous (Lgiant ≃ 150 L⊙
Thompson, Todd A +31 more
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Optical Detection of Cellular Signals at Material Interfaces
Advanced Healthcare Materials, EarlyView.Emerging functional materials are transforming optical detection of cellular signals. This review highlights optical techniques that exploit the unique optical properties of diverse materials to detect and quantify cellular electrical, chemical, and mechanical signals, and discusses key opportunities and challenges.
Xuchen Ren +5 more
wiley +1 more source
Finding the unusual red giant remnants of cataclysmic variable mergers
The Open Journal of AstrophysicsMergers between helium white dwarfs and main-sequence stars are likely common, producing red giant-like remnants making up roughly a few percent of all low-mass ($\lesssim2M_\odot$) red giants.
Nicholas Z. Rui, Jim Fuller
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Color‐Color Relations for Red Giants in Star Clusters [PDF]
Publications of the Astronomical Society of the Pacific, 1998 21 pages, 7 figures; AASTeX 4.0; to appear in the July 1998 edition of PASP.
von Braun, Kaspar +4 more
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Limits to the Hall Effect and Other Nonreciprocal Effects in Three‐Dimensional Metamaterials
Advanced Materials, EarlyView.Comprehensive and fundamental bounds on nonreciprocal effects in three‐dimensional metamaterials are derived. They reveal that the effective Hall mobility cannot exceed the largest constituent mobility, that, under certain conditions, the Verdet constant cannot be enhanced, and that, for constituents with Hall coefficients of the same sign, the largest
Christian Kern, Graeme W. Milton
wiley +1 more source
On the Missing Red Giants near the Galactic Center
The Astrophysical JournalThere is a long-acknowledged deficiency of bright red giants relative to fainter old stars within a few arcseconds of Sgr A*. We explore whether this could be due to tidal stripping by the central black hole.
Taeho Kim, Jeremy Goodman
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EPJ Web of Conferences, 2013 Precision asteroseismic observations with the Kepler and CoRot satellites enable the internal structure and evolution of pulsating stars to be more exhaustively studied than has hitherto been possible.
Lynas-Gray A.E.
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