1,604 research outputs found
On Be Star Candidates and Possible Blue Pre-Main Sequence Objects in the Small Magellanic Cloud
Recently the OGLE experiment has provided accurate light curves and colours
for about 2 millions stars in the Small Magellanic Cloud. We have examined this
database for its content of Be stars, applying some selection criteria, and we
have found a sample of 1000 candidates. Some of these stars show
beautiful light curves with amazing variations never observed in any Galactic
variable. We find outbursts in 13% of the sample (Type-1 stars), high and low
states in 15%, periodic variations in 7%, and the usual variations seen in
Galactic Be stars in 65% of the cases. The Galactic counterparts of Type-1
objects could be the outbursting Be stars found by Hubert & Floquet (1998)
after the analysis of Hipparcos photometry. We discuss the possibility that
Type-1 stars could correspond to Be stars with accreting white dwarf companions
or alternatively, blue pre-main sequence stars surrounded by thermally unstable
accretion disks. We provide coordinates and basic photometric information for
these stars and some examples of light curves.Comment: 9 pages, 8 figures, accepted for publication in Astronomy and
Astrophysic
The ossified interclinoid ligament
The paper presents an anatomical description of the ossified interclinoid ligament
which was found in a male human skull. In the case studied the ossified
ligament exists as a bony bridge between the anterior and posterior clinoid
processes on the left side of the skull. The length of this connection was measured
as 5.0 mm, while its thickness was 3.2 mm. We conjecture that the presence
of a considerably thick bony trabecula within the sella region might have
had an impact on the course of the internal carotid artery or the oculomotor
nerve, causing compression of these structures
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