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Ultraviolet extinction and diffuse band strength correlations
Correlations between UV extinction parameters and diffuse band strengthsare south, using a data base of 50 stars with recently measuredextinction curves. A novel aspect of this study is that the basicdependence of most interstellar parameters on E(B-V) (or, nearlyequivalently, on the total hydrogen column density) has been largelycanceled out. After this cancellation, a weak correlation is foundbetween the 4430 A diffuse band and the 2175 A extinction feature. Noother correlations are found. These results support a molecular originfor the 5780 A and 6284 A bands. It is speculated that the correlationpattern found for the 4430 A band can be explained if this bandoriginates in reactions on disordered grain surfaces.
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Osservazione e dati astrometrici
| Costellazione: | Andromeda |
| Ascensione retta: | 00h00m08.48s |
| Declinazione: | +36°35'09.5" |
| Magnitudine apparente: | 8.598 |
| Distanza: | 207.9 parsec |
| Moto proprio RA: | -7.5 |
| Moto proprio Dec: | 9.2 |
| B-T magnitude: | 10 |
| V-T magnitude: | 8.714 |
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