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Photometry of Star Clusters in the M 31 Galaxy. Aperture Size Effects

Narbutis, D.; Vansevičius, V.; Kodaira, K. +2 more

A study of aperture size effects on star cluster photometry in crowded fields is presented. Tests were performed on a sample of 285 star cluster candidates in the South-West field of the M 31 galaxy disk, measured in the Local Group Galaxy Survey mosaic images (Massey et al. 2006). In the majority of cases the derived UBVRI photometry errors repre…

Dust Distribution in [WR] Planetary Nebulae: a Case of M2-43

Szczerba, R.; Hajduk, M.; Gesicki, K.

Simultaneous presence of O- and C-rich molecules and/or dust is commonly known as mixed or dual chemistry. C-rich [WR] central stars show at the same time the presence of polycyclic aromatic hydrocarbons (PAHs) and crystalline silicates in their nebulae. We perform radiative transfer modeling of ISO spectrum for M2-43 to determine spatial location…

Eclipse Mapping of Symbiotic Binaries

Crowley, C.; Espey, B.

We describe an ultraviolet eclipse mapping of the symbiotic binary EG And. Analysis of FUSE and HST/STIS observations at differing orbital phases probe different layers of the chromosphere and wind of the red giant in absorption. Whilst the primary aim of the study is to examine the thermal and dynamic conditions at the base of these winds, much i…

New Insights Into the Dynamics and Expansion Parallax of Nebulae around Symbiotic Stars

Corradi, R. L. M.; Santander-García, M.

Currently, there are a dozen known spatially resolved nebulae around symbiotic stars. We summarize their properties, focusing on their dynamical ones. Then, new results about the determination of the expansion in the plane of the sky of the nebulae around Hen 2-104 and Hen 2-147, which allows us to gain important information about their dynamics a…