Observational analysis of the well--correlated diffuse bands: 6196 and 6614 \AA

TL;DR

This study confirms a strong correlation between the diffuse interstellar bands at 6196 and 6614 Å across multiple observatories, but reveals their varying strength ratios and profile shapes, indicating different responses to interstellar conditions.

Contribution

It provides the first multi-observatory confirmation of the tight correlation and highlights the non-uniform behavior of these bands under different interstellar environments.

Findings

Strong correlation between 6196 and 6614 bands.

Variable strength ratios and profile shapes.

Bands respond differently to interstellar conditions.

Abstract

We confirm, using spectra from seven observatories, that the diffuse bands 6196 and 6614 are very tightly correlated. However, their strength ratio is not constant as well as profile shapes. Apparently the two interstellar features do not react in unison to the varying physical conditions of different interstellar clouds.