SIMBAD references

1996A&A...310..143F - Astronomy and Astrophysics, volume 310, 143-163 (1996/6-1)

Variability of classical T Tauri stars. Its relation to the accretion process.


Abstract (from CDS):

We present the analysis of a UBV(RI)c photometric monitoring program carried out from July 1988 to August 1992 on a sample of 13 classical T Tauri stars and 2 suspected classical T Tauri stars. We detected optical irregular variability with an amplitude larger than 0.1mag in the V band in 8 stars. For 5 of them most of the variability can be attributed to hot spots, for one, to cool spots and for two of them, there is no clear mechanism; nevertheless, other phenomena must explain the short term (hours-days) and long term (years) variations superimposed. For some objects an anomalous behaviour at the shorter wavelengths (U band) is detected. From the comparison between the amplitude of the optical variability due to hot spots and the equivalent width of the Hα emission a correlation between them is suggested. Assuming that the Hα emission is related to the accretion process, this correlation supports the idea that we are observing the hot spots where the material from the accretion disks falls onto the star.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main sequence - accretion disks - star spots

VizieR on-line data: <Available at CDS (J/A+A/310/143): tables>

Simbad objects: 29

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