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Toward an adequate method to isolate spectroscopic families of diffuse interstellar bands
We divide some of the observed diffuse interstellar bands (DIBs) intofamilies that appear to have the spectral structure of single species.Three different methods are applied to separate such families, exploringthe best approach for future investigations of this type. Starting witha statistical treatment of the data, we found that statistical methodsby themselves give insufficient results. Two other methods of dataanalysis (`averaging equivalent widths' and `investigating the figureswith arranged spectrograms') were found to be more useful as tools forfinding the spectroscopic families of DIBs. On the basis of thesemethods, we suggest some candidates as `relatives' of 5780- and5797-Å bands.
| Mount Wilson Spectrograms of P Cygni.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1957ApJ...125..102A&db_key=AST
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Observation and Astrometry data
| Constellation: | わし座 |
| Right ascension: | 20h19m39.30s |
| Declination: | +00°52'07.8" |
| Apparent magnitude: | 8.904 |
| Proper motion RA: | 1.9 |
| Proper motion Dec: | -26.6 |
| B-T magnitude: | 10.301 |
| V-T magnitude: | 9.02 |
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