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The influence of the envelope in the variations of transitory type Be stars
The contribution of the stellar envelope to variations oftransitory-type Be stars, which are alternately of types B and Be, isinvestigated. The Rojas-Herman classification is applied to thequantification of long-term stellar variation for a sample of Be starsbrighter than magnitude 7, and compared with the spectral properties ofthese stars. A relation is derived between the equivalent widths of theH-alpha and H-beta lines and the stellar U-B index. The U-B index isthen calibrated as a function of the Balmer discontinuity in order toseparate the contributions of the star and its envelope to the emission.The separate U-B indices derived for the star, which are characterizedby long-term variations, and the envelope, which is sensitive toshort-term variations, are observed to be additive, implying that theobserved flux is a convolution of the fluxes emitted by the star and itsenvelope.
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Observation and Astrometry data
| Constellation: | Ιχθείς |
| Right ascension: | 23h03m46.20s |
| Declination: | +07°20'04.1" |
| Apparent magnitude: | 8.796 |
| Proper motion RA: | -12.2 |
| Proper motion Dec: | 0.8 |
| B-T magnitude: | 9.395 |
| V-T magnitude: | 8.846 |
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