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Interstellar polarization from 3 to 5 microns in reddened stars

1992; IOP Publishing; Volume: 392; Linguagem: Inglês

10.1086/171470

1538-4357

P. G. Martin, A. J. Adamson, D. C. B. Whittet, J. H. Hough, Jeremy Bailey, S.-H. Kim, S. Sato, Motohide Tamura, Takuji Yamashita,

Stellar, planetary, and galactic studies

view Abstract Citations (65) References (54) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interstellar Polarization from 3 to 5 Microns in Reddened Stars Martin, P. G. ; Adamson, A. J. ; Whittet, D. C. B. ; Hough, J. H. ; Bailey, J. A. ; Kim, S. -H. ; Sato, S. ; Tamura, M. ; Yamashita, T. Abstract The study reports measurements of IR interstellar linear polarization in the spectral range 2-5 microns for 18 highly reddened stars. The observations covered lines of sight with wavelengths of peak polarization lambda(max) ranging from the blue-UV (0.35 micron) to the near-IR (0.78 micron). It is shown that excess polarization occurs at 3-5 microns relative to the standard Serkowski/Wilking empirical formula describing the wavelength dependence of polarization in the optical and near-IR out to 2.2 microns. The results of Nagata (1990) and Jones (1990) that significant excess exists at 3.6-3.8 microns are confirmed, and it is shown that it persists to 5 microns. It is found that neither the excess polarization relative to the Serkowski/Wilking formula nor the value of the power-law index is correlated to changes in lambda(max). Hence, the IR polarization does not respond to changes in the properties of the grains which give rise to dramatic variations in the wavelength dependence of polarization at shorter wavelengths, suggesting a degree of invariance in the form of the IR polarization law. Publication: The Astrophysical Journal Pub Date: June 1992 DOI: 10.1086/171470 Bibcode: 1992ApJ...392..691M Keywords: Cosmic Dust; Infrared Stars; Interstellar Extinction; Linear Polarization; Infrared Astronomy; Molecular Clouds; Astrophysics; ISM: DUST; EXTINCTION; INFRARED: STARS; POLARIZATION full text sources ADS | data products SIMBAD (20)