Ultraviolet extinction towards far OB associations |
| |
| Authors: | S Aiello B Barsella I Guidi U Penco M Perinotto |
| |
| Institution: | (1) Institute of Physics and CNR/GIFCO Research Unit, Florence, Italy;(2) Institute of Astronomy, University of Pisa, Pisa, Italy;(3) Arcetri Astrophysical Observatory, Florence, Italy |
| |
| Abstract: | Stars in the Aur OB-2 and Sco OB-1 associations, located in the direction of the galactic anticenter and center, respectively, have been observed for interstellar extinction. No effects due to changes of grain composition across such large distances are seen. A star exhibiting a peculiar extinction is found in each association. The properties of the responsible dust grains are discussed in terms of a two-component dust mixture: graphite and uncoated silicates. The column density both of graphite and silicate atoms are found to be higher than in stars of the same associations exhibiting a regular UV extinction.Based on observations by the International Ultraviolet Explorer collected at the Villafranca Satellite Tracking Station of the European Space Agency. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
