Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..212m&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Year of IUE Res. p 212 (SEE N85-20961 11-89)
Astronomy and Astrophysics
Astronomy
B Stars, Early Stars, Galactic Nuclei, Interstellar Extinction, Main Sequence Stars, Ultraviolet Radiation, Interstellar Matter, Iue, Ultraviolet Spectroscopy
Scientific paper
The extinction curves in the direction of four early-b main sequence stars located in the nucleus of h Per were constructed and compared with each other and with the extinction curves derived from eight stars of the same general area but lying at different distances. Ultraviolet-blue-visual (UBV) photometry and low dipsersion optical and ultraviolet (IUE) spectroscopy were used to derive these curves. The interstellar reddening law in the line of sight of the four h Per stars is constant. This result, together with the constant color excess found by Crawford et al. (1970) for a larger sample of member stars, indicates that there is no appreciable gradient in the properties of the dust particles within the nucleus itself. The same curves agree well with the curves derived from stars located in the region of the Perseus arm surrounding the cluster. This indicates that the interstellar medium in h Per has the same properties as the medium outside the cluster; thus the high energy radiation and mass fluxes produced by the very large number of hot star populating h Per do not affect the properties of the dust particles. It was also found that there is a rather smooth decrease of the extinction per unit distance with increasing height from the galactic plane.
Magazzu Antonio
Stalio Roberto
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