Bibcode
Feinstein, C.; Martínez, R. E.; Vergne, M. M.; Baume, G.; Vázquez, R. A.
Referencia bibliográfica
Boletín de la Asociación Argentina de Astronomía, vol.45, p.49
Advertised on:
0
2002
Número de citas
0
Número de citas referidas
0
Descripción
In a typical young open cluster the polarimetric data shows, for normal
stars, that the distribution of angles of the polarization vectors can
be describe by a fixed value that caracterizes the cluster. Individual
stars show some scatter over this mean angle because of fluctuations in
the interstellar medium (ISM), variations in the magnetic field of the
galaxy and the intrinsic polarimetric properties of the stars. NGC 6231
is one of the youngest open cluster in the Galaxy, locate in the Sco
region. The distribution of its polarization angles is abnormal, and
three diferent groups of stars can be determinated, according to the
star location and to the angle of the polarization vectors. In
particular, in the cluster's core, the vectors form part of a
semi-circular structure, probably as a consequence of a energetic
phenomena (supernova event) that has produced a shock over the ISM
re-orienting the dust grains to the new direction of the magnetic field.
In the present study, we discuss what probability there is that a
supernova event could have happened in NGC 6231. We estimate the
location and the age of the event and we study the relationship between
the polarization and the extinction.