Optical Polarization Observations of NGC 6231: Evidence for a Past Supernova Fingerprint
| Autor: | Ruben E. Martínez, Gustavo Baume, Ruben Angel Vazquez, Carlos Feinstein, M. M. Vergne |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Open clusters and associations: individual (NGC 6231)
Ciencias Astronómicas Supernova remnants Astrophysics::High Energy Astrophysical Phenomena Ciencias Físicas Dust particles Polarimetry FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics individual (NGC 6231) [Open clusters and associations] purl.org/becyt/ford/1 [https] Galaxy groups and clusters Interstellar medium Polarization Astrophysics::Solar and Stellar Astrophysics Astrophysics::Galaxy Astrophysics Dust extinction Physics Open clusters Astrophysics (astro-ph) Astronomy and Astrophysics Optical polarization purl.org/becyt/ford/1.3 [https] Polarization (waves) Magnetic field Astronomía Stars Supernova Space and Planetary Science NGC 6231 (galaxia) CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | We present the first linear multicolor polarization observations for a sample of 35 stars in the direction of the Galactic cluster NGC 6231. We have found a complex pattern in the angles of the polarimetric vectors. Near the core of this cluster the structure shows a semi-circular pattern that we have interpreted as a re-orientation of the dust particles, showing the morphology of the magnetic field. We propose that a supernova event has occurred some time ago and produced a shock on the local ISM. We discuss in this paper independent confirmations othis event, both from the studies on the diffuse interstellar absorptions Crawford (2001) and the results of the pre-main sequence stars (PMS) given by Sung et al. (1998). We also show that a supernova is supported by the evolutive status of the cluster. Comment: 24 pages, 4 figures, ApJ Accepted |
| Databáze: | OpenAIRE |
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