A note on stellar ultraviolet linear polarization observations

Details A note on stellar ultraviolet linear polarization observations A note on stellar ultraviolet linear polarization observations

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..588h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 588-590. Research supported by the Emil Aaltonen Foun

Astronomy and Astrophysics

Astrophysics

16

Cool Stars, Linear Polarization, Stellar Radiation, Ultraviolet Radiation, Late Stars, Polarimeters, Sky Brightness, Telescopes

Scientific paper

Broadband linear polarization observations of cool stars are discussed. It is shown that the effects of moonlight on the observations made with double beam chopping UBVRI polarimeters are below the observational accuracy. The sky background is compensated to less than 1/500 of the original sky polarization in UBV, and the residual linear polarization caused by the moonlight is smaller than 0.005 percent in all practical cases, and therefore cannot affect the results reported by Huovelin et al. (1985, 1988). The consistency of the instrumental corrections is also confirmed by simultaneous observations with two different telescopes. Finally, possible reasons for the discrepancy between the results of Leroy and Le Borgne (1989) and Huovelin et al. are discussed.

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