Interstellar Extinction Law for the Pleiades (Spanish Title: La Ley de Extinción Interestelar en las Pleyades)

Details Interstellar Extinction Law for the Pleiades (Spanish Title: La Ley de Extinción Interestelar en las Pleyades) Interstellar Extinction Law for the Pleiades (Spanish Title: La Ley de Extinción Interestelar en las Pleyades)

Feb 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965bott....4....3m&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 4, pp. 3-7 (1965) (http://www.astroscu.unam.mx/bott/)

Astronomy and Astrophysics

Astronomy

14

Galaxy: Open Clusters And Associations: Individual (Pleiades), Ism: Dust, Extinction

Scientific paper

We have made (U, B, V, R, I, J, K) photometric observations on a reddened AO V star, which is a member of The Pleiades (Hz 371). These data have been interpreted in terms of the interstellar extinction law. If we determine the ratio of total-to-selective absorption, R = A_v/E_(B-V), from an extrapolation of the infrared observations to zero from K (Johnson and Borgman 1963), we find R = 3.6. If we determine this ratio from the relation between the apparent magnitude of a star, V, and the apparent magnitude corrected for interstellar absorption, V_o, for a group of Pleiades having nearly the same spectral characteristics as Hz 371, per example, the B9.5 V - A1 V stars, we find R = 4.2. This result applies only to the extinction that is variable within the cluster. If there is general extinction between us and the Pleiades, our procedure will not detect it. These values of the ratio of total-to-selective absorption, R, have been determined for only one star in the cluster. Eggen's (1950) value of this ratio, from the comparison of Hz 371 with two cluster stars gives, approximately R = 3.7. Johnson (1964b) has found from data both in Cepheus and NGC 2244 that the R obtained from the extrapolation of the infrared observations is dangerous. Such extrapolation leads to much too small a value of R. Our results indicate that in the direction of the Pleiades, to some extent, this is so. Thus, we may conclude that R is nearer to 4 than the "normal" value of 3. R = 4.0 will be the adopted value for this direction.

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