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HD 224708


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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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Observation and Astrometry data

Constellation:Andromeda
Right ascension:00h00m08.48s
Declination:+36°35'09.5"
Apparent magnitude:8.598
Distance:207.9 parsecs
Proper motion RA:-7.5
Proper motion Dec:9.2
B-T magnitude:10
V-T magnitude:8.714

Catalogs and designations:
Proper Names
HD 1989HD 224708
TYCHO-2 2000TYC 2271-1411-1
USNO-A2.0USNO-A2 1200-00001253
HIPHIP 9

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