6533b825fe1ef96bd128307c
RESEARCH PRODUCT
Be stars in open clusters. I. uvby $ ^{\bf \beta}$ photometry
Guillermo BernabeuA. MarcoVictor RegleroPablo ReigJ. BusquetsJuan FabregatJ. M. Torrejonsubject
PhysicsAstrophysics::High Energy Astrophysical PhenomenaK-type main-sequence starContinuum radiationGeneral Physics and AstronomyAstronomyBalmer seriesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsCircumstellar envelopePhotometry (optics)Starssymbols.namesakesymbolsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsOpen clusterdescription
We present uvby β photometry for Be stars in eight open clusters and two OB associations. It is shown that Be stars occupy anomalous positions in the photometric diagrams, which can be explained in terms of the circumstellar continuum radiation contribution to the photometric indices. In the - M V plane Be stars appear redder than the non emission B stars, due to the additional reddening caused by the hydrogen free-bound and free-free recombination in the circumstellar envelope. In the c 0 - M V plane the earlier Be stars present lower c 0 values than absorption-line B stars, which is caused by emission in the Balmer discontinuity, while the later Be stars deviate towards higher c 0 values, indicating absorption in the Balmer discontinuity of circumstellar origin.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-10-01 | Astronomy and Astrophysics Supplement Series |