Observation of interstellar polarization at 2.2 and 3.8 microns

Details Observation of interstellar polarization at 2.2 and 3.8 microns Observation of interstellar polarization at 2.2 and 3.8 microns

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348l..13n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. L13-L16.

Astronomy and Astrophysics

Astronomy

24

Infrared Astronomy, Interstellar Matter, Linear Polarization, Interstellar Extinction, Line Spectra, Power Series

Scientific paper

Interstellar linear polarization has been observed in the K (2.2 micron) and L-prime (3.8 micron) bands for 30 stars. The K band results generally agree with the previous measurements. The L-prime polarization, obtained for the first time, is larger for most stars than Serkowski's (1974) and Wilking's (1980) empirical formulas predict. From these observations, a power-law dependence of polarization of about wavelength exp-2 in the wavelength range of 1.25-2.2 microns is proposed; this dependence is similar to that of interstellar extinction. The decrease of polarization from K to L-prime is even slower than this power-law. This might be also similar to the extinction law, but confirmation by further observations is necessary.

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