منابع مشابه
Dust formation in winds of long-period variables IV. Atmospheric dynamics and mass loss
We have calculated radiation-hydrodynamical models of the atmosphere and circumstellar dust shell ofC-rich longperiod variables which include a detailed description of the dust formation process. We discuss the time-dependent behaviour of the circumstellar envelope (e.g. multiperiodicity) and its relevance for observational properties like near-IR light curves and investigate the time-averagedm...
متن کاملLong Period Variables detected by ISO in the SMC
This article presents the study of the light–curves extracted from the MACHO database of a sample of stars observed by the Infrared Space Observatory in the Small Magellanic Cloud. These stars belong to the ISO–Mini-Survey catalogue of the Magellanic Clouds (ISO–MCMS, Loup et al. in preparation). Most of them are in the asymptotic giant branch (AGB) and supergiant phases. The dominant period an...
متن کاملLong Period Variables in NGC 5128 : II . Near - IR properties ⋆
Long Period Variable stars are ubiquitous among the bright red giant branch stars in NGC 5128. Mostly they are found to be brighter than the tip of the first ascent giant branch with magnitudes ranging from about K = 19 to K = 21.5. They have periods between 155 and 1000 days and K-band amplitudes between 0.1 and 2 mag, characteristic of semi-regular and Mira variables. We compare the colors, p...
متن کاملLong Period Variables in NGC 5128 : I . Catalogue ⋆ ⋆
The first variable star catalogue in a giant elliptical galaxy NGC 5128 (Centaurus A) is presented. Using multi-epoch observations with ISAAC at the VLT we have detected 1504 red variables in two halo fields covering 10.46 arcmin square. For the variables with at least 10 good measurements, periods and amplitudes were determined using Fourier analysis and non-linear sine-curve fitting algorithm...
متن کاملLuminous Blue Variables & Mass Loss near the Eddington Limit
During the course of their evolution, massive stars lose a substantial fraction of their initial mass, both through steady winds and through relatively brief eruptions during their Luminous Blue Variable (LBV) phase. This talk reviews the dynamical driving of this mass loss, contrasting the line-driving of steady winds to the potential role of continuum driving for eruptions during LBV episodes...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1977
ISSN: 0252-9211
DOI: 10.1017/s0252921100069700