Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..108s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Jan. 1984, p. 108-114.
Astronomy and Astrophysics
Astronomy
16
Chromosphere, Stellar Activity, Stellar Envelopes, Stellar Spectrophotometry, T Tauri Stars, Color-Color Diagram, Optical Thickness, Photosphere, Spectral Energy Distribution, Stellar Color, Stellar Evolution, Stellar Spectra, Variability
Scientific paper
Three mechanisms have been suggested to account for the photometric variability in T Tauri stars: (1) changes in the effective photospheric spectral type; (2) changes in the optical thickness of the chromosphere; and (3) changes in the optical thickness of the dust shell. The author investigates these processes with color-color diagrams and energy distribution plots of 14 stars located in the Taurus-Auriga dark cloud complex. A relationship between a strong chromosphere and chromospheric variability was found as well as a similar relationship between a thick dust shell and dust shell variability. There is some evidence that the stellar photosphere becomes more stable with increasing age during the T Tauri phase.
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