Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..726w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, July 1990, p. 726-744.
Other
18
Orion Nebula, Pre-Main Sequence Stars, Star Clusters, Stellar Rotation, Stellar Spectrophotometry, Astronomical Photometry, Galactic Clusters, Photoelectric Emission, Stellar Luminosity, Stellar Temperature, Pre-Main-Sequence Stars: Non-T-Tauri Stars: Photometric Variability: Rotationally Modulated Variability
Scientific paper
Photoelectric monitoring has been carried out for five moderate to rapidly rotating non-T-Tauri pre-main-sequence stars in the Orion nebula cluster. In four of these stars, rotationally modulated light variations due to disturbances on the surfaces of the stars have been detected, the rotation periods ranging from 0.4-3.0 days. In one case the observed disturbance appears to have certainly been a dark spot, while in another star the variations appear to have resulted from a hot spot or spots. In two stars the type of disturbance is indeterminate. In one star the (hot) disturbed region appears to have persisted with little (or constant) drift over the stellar surface for about two years. In another, rotation periods differing as much as 22% are observed to occur over epochs of several days duration, separated by intervals of as little as 23 days, suggesting (1) that this star undergoes differential rotation and (2) that disturbances form and dissipate rapidly at different stellar latitudes and/or that rapid migration of disturbed areas over the surface of the star occurs. The radii of the stars derived from their rotation periods and spectroscopically determined rotational velocities are in reasonable agreement with those calculated from their observed absolute luminosities and effective temperatures.
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