A three-year Strömgren photometric survey of suspected beta Pictoris-like stars

Astronomy and Astrophysics – Astrophysics

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Stars: Beta Pic, Circumstellar Matter, Planetary Systems, Strömgren Photometry

Scientific paper

We carried out a Strömgren photometric survey of thirteen southern bright stars, including beta Pictoris itself, during three years, d'Astrophysique de Paris, in order to detect possible weak photometric variations. beta Pictoris presents a small long-term variation with a change of brightness by -2.1 10-3 mag per year, over about two years from beginning of 1996, a situation relatively similar to the one about 18 years ago. Among the other stars, only HD 38392 presents weak photometric variations with a period of 21.4 days, probably related to the star rotation period. The negative result concerning photometric variations of all other stars suggests that those stars are actually really stable and strengthens the reality of the variations discovered in the case of beta Pictoris and HD 38392. Based on observations obtained at the Danish 50 cm telescope (SAT) at ESO, La Silla, Chile.

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