Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-08
Astronomy and Astrophysics
Astrophysics
: 9 pages, LaTeX, 7 figures. Accepted for publications in AA
Scientific paper
10.1051/0004-6361:20011313
Using data from the EROS2 microlensing survey, we report the discovery of two blue objects with irregular photometric behaviour of $\Delta V \sim 0.1$-0.4 mag on time scales of 20 to 200 days. They show a bluer when fainter behaviour. Subsequent spectra taken with the ESO 3.6m telescope show spectral type B4eIII and B2eIV-V with strong $H \alpha$ emission. These objects resemble the Herbig AeBe but also classical Be stars. At this stage, it is not possible to distinguish unambiguously between pre-main sequence and classical Be nature. If we favour the pre-main sequence interpretation, they are more luminous than the luminosity upper limit for Galactic HAeBe stars. The same was found for the HAeBe candidates in the LMC. This might be due to a shorter accretion time scale ($\tau = M_*/\dot{M}$), or the smaller dust content during the pre-main sequence evolution of SMC and LMC stars.
Beaulieu J.-Ph.
collaboration EROS2
Coutures Ch.
de Wit Willem-Jan
Lamers J. G. M. H. L.
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