Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rmxaa...2..175j&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, 2, 175
Astronomy and Astrophysics
Astronomy
30
Scientific paper
RESUMEN Se ha usado Ia fotometria de banda intermedia de 1 3-colores, publicada recientemente por Johnson y Mitchell, para investigar la ley de extinci6n interestelar en varias regiones del cielo. Esta ley tiene valores diferentes en estas regiones, lo que debe indicar que hay diferencins fisicas en el material interestelar que produce la extinci6n en las diversas regiones estudindas. Sin embargo, un valor de R = Av/E( ) = 3.24 0.2 (p.e.), quiza's sea satisfactorio parn estudios estadisticos en nuestra galaxin. De nuevo se ha encontrado que el valor de R en la regi6n de in nebulosa de Ori6n es mucho ma's grande que en otras partes del cielo. Parece posible adema's que en aquellas regiones con estrellas 0 embebidas en nebulosas, R tiene valores grandes. ABSTRACT The new 13-color medium-narrow band photometry published by Johnson and Mitchell has been used to investigate the law of interstellar extinction in several regions of the sky. The extinction laws in these regions are different, and must indicate that there are physical differences of the interstellar material which produces the extinction in the several regions studied. Nevertheless, n value of R = Av/E (B-V) = 3.24 0.2 (p.e.) probably is satisfactory for statistical investigations in our Galaxy. The value of R in the region of the Orion Nebula has again been found, to be much higher; and it seems likely that high values of R will be found in regions where 0-type stars are imbedded in nebulae. Key words: INTERSTELLAR: REDDENING - EXTINCTION - PHOTOMETRY.
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