Results 1 to 10 of about 18,658 (96)
Infrared imaging of late-type stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1996 Infrared imaging properties of dusty winds around late-type stars are investigated in detail, employing a self-consistent model that couples the equations of motion and radiative transfer. Because of general scaling properties, the angular profiles of surface brightness are self-similar. In any given star, the profile shape is determined essentially by
Ivezic, Zeljko, Elitzur, Moshe
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The circularization time-scales of late–type binary stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT We examine the consequences of, and apply, the formalism developed in Terquem (2021) for calculating the rate DR at which energy is exchanged between fast tides and convection. In this previous work, DR (which is proportional to the gradient of the convective velocity) was assumed to be positive in order to dissipate the tidal ...
Terquem, Caroline, Martin, Scott
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Polyatomic Molecules in Late-Type Stars. [PDF]
The Astrophysical Journal, 1948 Some general problems connected with the presence of polyatomic molecules in stellar atmospheres are noted, and, in particular, reasons are advanced in favor of attributing at least part of the intensity drop and fluctuations in the spectra of the N-type stars violetward of λ 4100 to the triatomic molecule CH2.
Swings, Polydore, McKellar, A.
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Superflares on Late-Type Stars [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractWe present the results of an extensive survey of superflares on late-type stars (G, K, and M-type main sequence stars) using the Kepler satellite data. Wefound about 6,800 superflares on late-type stars from the data of about 120,000 stars observed over 500 days.
Hiroyuki Maehara +7 more
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The masses of late-type WN stars [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractWe present recent results for galactic WNL stars, obtained with the new Potsdam Wolf-Rayet (PoWR) hydrodynamic model atmospheres. Based on a combination of stellar wind modeling and spectral analysis we identify the galactic WNL subtypes as a group of extremely luminous stars close to the Eddington limit.
Gräfener, G., Hamann, W. -R.
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Radial Velocities for 889 Late‐Type Stars [PDF]
The Astrophysical Journal Supplement Series, 2002 We report radial velocities for 844 FGKM-type main sequence and subgiant stars and 45 K giants, most of which had either low-precision velocity measurements or none at all. These velocities differ from the standard stars of Udry et al. by 0.035 km/s (RMS) for the 26 FGK standard stars in common.
Nidever, David L. +4 more
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Flare in Late-type Stars: UV [PDF]
International Astronomical Union Colloquium, 1995 Early studies of stellar flares were made entirely in the optical regime. It was recognised that flares arose from the generation of hot plasma within the stellar chromosphere at whose temperature (indicated, for instance, by the presence of a strong, blue optical continuum) a substantial emission in the ultraviolet would be expected.
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SiO Isotope Emissions from Late-Type Stars [PDF]
International Astronomical Union Colloquium, 1988 AbstractThe J=2-1, v=0 emissions of 28SiO, 29SiO, and 30SiO from three late-type stars were simultaneously observed with the Nobeyama 45-m telescope in Jaunuary 1987. The relative intensities of [29SiO] / [30SiO] were measured to be 2.4 for χ Cyg, 1.5 for NML Tau, and 2.9 for V1111 0ph.
N. Ukita, N. Kaifu
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Photospheric Macroturbulence in Late-Type Stars [PDF]
International Astronomical Union Colloquium, 1980 It is intimidating to attempt a review of the subject of late-type stars macroturbulence which follows so closely on the heels of David Gray’s (1978) fine review in Solar Physics. Therefore this paper will avoid many emphases of his review while filling in some areas where some progress has emerged in the last 1-1/2 years.
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Gravity darkening in late-type stars [PDF]
Astronomy & Astrophysics, 2018 Context.Recent interferometric data have been used to constrain the brightness distribution at the surface of nearby stars, in particular the so-called gravity darkening that makes fast rotating stars brighter at their poles than at their equator. However, good models of gravity darkening are missing for stars that posses a convective envelope.Aim.In ...
Raynaud, Raphaël +4 more
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