Reddening factor

The reddening factor is defined as the absorption in the V-band relative to the colour index B-V... 

It is rather usual to express the extinction law as a function of the reddening factor. Following the parameterization proposed by Fitzpatrick and Massa (1986) and Fitzpatrick (1999) it is possible to reproduce the extinction curves in different lines of sight in the range 3-8 eV with the function ... 

Health and Safety Factors. The following toxicides for acetonitrile have been reported oral LD q (lats), 3030—6500 mg/kg skin LD q (rabbits), 3884—7850 mg/kg and inhalation LC q (i ts), 7500—17,000 ppm (29). Humans can detect the odor of acetonitrile at 40 ppm. Exposure for 4 h at up to 80 ppm has not produced adverse effects. However, exposure for 4 h at 160 ppm results in reddening of the face and some temporary bronchial tightness. 

The estimate of the distance must now consider the estimate of the interstellar extinction Av, best estimated by the reddening Av can take several values and in calculations of molecular cloud chemistry typical values are of order 1 but may be as much as 5. The distance calculation in Equation 5.1 can be significantly perturbed so that an A v of 2.4 can reduce the apparent distance by a factor of 3. 

The first report of an experimentally-induced deficiency was by Doisy (1) who fed two subjects a formula diet that was deficient in vitamin K. One of the subjects developed a slight reddening of the hair, a scaly, transient dermatitis, depressed vitamin K-dependent clotting factors, and hypocholesterolemia. The symptoms were unresponsive to vitamin K but disappeared when a normal diet was resumed. When Doisey recalculated his purified diet, he realized that he had inadvertently omitted the manganese. The diet had contained a manganese level of only 0.34 mg/day and apparently had produced a manganese deficiency. 

Figure 8 Abundances of elements along the line of sight towards Oph Ophiuchus), a moderately reddened star that is frequently used as standard for depletion studies. The ratios of Oph abundances to the solar abundances are plotted against condensation temperatures. The abundances of many of the highly volatile and moderately volatile elements up to condensation temperatures of around 900 K are, within a factor of 2, the same in the ISM and in the Sun. At higher condensation temperatures a clear trend of increasing depletions with increasing condensation temperatures is seen. It is usually assumed that the missing refractory elements are in grains (source Savage and...

Using the same approach with the de-reddened data, we calculate a luminosity for IRc2 of roughly L 1 X IO Lq (with uncertainty of a factor... 

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