VBLUW photometry of the stars and nebulosity of N 70 in the LMC

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Magellanic Clouds, Nebulae, Star Clusters, Ubv Spectra, Visual Photometry, Hertzsprung-Russell Diagram, Interstellar Extinction, Radiant Flux Density, Stellar Color, Supergiant Stars

Scientific paper

Photometric VBLUW data are given for the stars and nebulosity of N 70 in the LMC. The data for the central cluster stars, an OB association mainly of main sequence stars, confirm earlier color determinations and spectral types. Located in the direction of the shell region of the nebula, a number of supergiants which may partly be associated with N 70 are found. The photometry for three of these stars give extinctions of A(VJ) = 3m. Also found for a few stars in other nebulae of the LMC, this amount of extinction - if of interstellar origin - does not agree with the interstellar gas to dust ratio of the LMC. The extinction may be produced in circumstellar dust shells.

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