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Interdependence of the 4430 A diffuse interstellar band, polarization, and ultraviolet extinction
Central intensities of the 4430-A diffuse interstellar band (DIB) areobtained from reticon spectra of 128 early-type stars, and stars in thePerseus OB1 association are found to have higher ratios of polarizationand weaker 4430-A intensities than do the stars in Cepheus OB3. Thecorrelation noted for OB1 between the A(4430) residuals and E(15-18) canbe explained if the 4430-A DIB arises in a thin grain mantle and the2200-A feature arises in the grain core. The absence of a 4430-A DIB inhigh-Galactic-latitude clouds would then be due to a lack of mantle. TheDIB ratio 5780/5797 A is found to resemble the behavior of the(4430-A)/E(B-V) ratio for seven stars from a range of Galacticlatitudes, confirming the existence of three previously identifiedfamilies of DIBs.
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Observation and Astrometry data
| Constellation: | Eridanus |
| Right ascension: | 02h58m55.61s |
| Declination: | -10°56'57.9" |
| Apparent magnitude: | 9.139 |
| Proper motion RA: | 145.9 |
| Proper motion Dec: | 60.7 |
| B-T magnitude: | 9.909 |
| V-T magnitude: | 9.203 |
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