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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57142745009 |
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Table of Contents:
- MULTICOLOR U BV RI POLARIMETRY OF NGC 4755 AND THE B CEPHEI POPULATION E. Irene Vega Ana María Orsatti Ruben E. Martínez Física, Astronomía y Matemáticas ISM dust stars NGG 4755 β Cephei We present U BV RI polarimetric observations of 66 stars in the direction of NGG 4755, including eleven β cephei stars. About half of these variables show indications of intrinsic polarization, but according to the theory neither radial nor non-radial pulsations could cause such polarizations. From the main characteristics of their Pv vs. λv curves we found as a possible origin, in some cases, scattering of light in extended atmospheres and suspected binarity, in some cases. The parameters of the interstellar medium towards the cluster are Pv = 2.76 ± 0.13(%) and θv = 76.°6 ± 0.°9; the mean wavelength of maximum polarization amounts to 0.56 ± 0.04 µm. The value of polarization efficiency is higher than the mean, indicating a good alignment of the dust particles. A total of 25 stars were identified as members of NGG 4755; the identification task was improved through the use of polarimetric tools. 2015 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57142745009 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.51