Linear Polarisation of Field M-dwarfs

Details Linear Polarisation of Field M-dwarfs Linear Polarisation of Field M-dwarfs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..305m&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Aperture linear polarisation measurement obtained with the STERENN polarimeter, at the Pic-du-Midi observatory, are presented for 20 nearby field dwarfs spanning spectral range M1 to M6. All measurements are compatible with a null polarisation. These results extend our previous measurements of nearby qultra cool dwarfs (from M9 to L8, Menard, Delfosse & Monin 2002). They suggest that in the warmer earlier dwarfs, dust is probably either fully absent (for the warmer ones) or completely homogeneously mixed in the atmosphere, both resulting in a null net polarisation.

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