Linear polarization observations of T Tauri stars. II - A sample of objects fainter than 13th magnitude

Details Linear polarization observations of T Tauri stars. II - A sample of objects fainter than 13th magnitude Linear polarization observations of T Tauri stars. II - A sample of objects fainter than 13th magnitude

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..564m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 564-572. Research supported by NSERC and Ministere de l'Education

Astronomy and Astrophysics

Astronomy

45

Astronomical Polarimetry, Faint Objects, Linear Polarization, Stellar Magnitude, T Tauri Stars, Northern Sky, Sky Surveys (Astronomy), Stellar Envelopes, Variable Stars

Scientific paper

A northern extension to about 15th mag of previous linear polarization surveys of T Tauri stars and other young stellar objects is presented. These surveys were complete to the 13th mag. The sample comprises 59 stars; 40 stars are fainter than 13th mag, and are observed for the first time with polarimetry, while the remainder are brighter T Tauri stars for which repeat observations are presented to check for variability. It is found that 15 of the newly observed stars display large values of intrinsic polarization, i.e., in excess of about 3 percent. It is shown that the statistics of the polarization data for T Tauri stars are compatible with the model of an optically thick circumstellar disk surrounding them. A complete list of all known polarimetrically variable, suspected variable, and nonvariable T Tauri stars known to date is given. It is concluded that at least 43 percent and perhaps all T Tauri stars are polarimetric variables.

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