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...

AGB variables of types Lb, SRa, SRb, and Mira are studied by fitting combinations of blackbodies to visual, near infrared and IRAS data. This paper supplements an earlier work dealing with a smaller sample of SRa and SRb variables. The fitted parameters T ∗, T d and Rd/R∗ are related to physically meaningful quantities. Also, quantities derived from the fits like the ratio of the luminosities o...

We present results from an empirical study of the Mg II h & k emission lines of selected Mira variable stars, using spectra from the International Ultraviolet Explorer (IUE). The stars all exhibit similar Mg II behavior during the course of their pulsation cycles. The Mg II flux always peaks after optical maximum near pulsation phase φ = 0.2 − 0.5, although the Mg II flux can vary greatly from ...

Infrared J and K photometry has been obtained of all red giants in the half square degree region of the LMC bar searched for variables using the MACHO database by Wood et al. (1999). The K–logP diagram shows the five distinct period–luminosity sequences which are also evident in the MACHO photometry. The K–logP plot allows identification of the Mira sequence from among the five observed sequenc...

In this paper we have investigated the spectrophotometric properties of the Asymptotic Giant Branch (AGB) stars and their contribution to the integrated infrared emission in simple stellar populations (SSP). Adopting analytical relations describing the evolution of these stars in the HR diagram and empirical relations for the mass-loss rate and the wind terminal velocity, we were able to model ...

During neuroblast (NB) divisions, cell fate determinants Prospero (Pros) and Numb, together with their adaptor proteins Miranda (Mira) and Partner of Numb, localize to the basal cell cortex at metaphase and segregate exclusively to the future ganglion mother cells (GMCs) at telophase. In inscuteable mutant NBs, these basal proteins are mislocalized during metaphase. However, during anaphase/tel...