Constraining the properties of spots on Pleiades very low mass stars

Details Constraining the properties of spots on Pleiades very low mass stars Constraining the properties of spots on Pleiades very low mass stars

2005-05-27

arxiv.org/abs/astro-ph/0505567v1

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, Astronomy & Astrophysics, in press

Scientific paper

10.1051/0004-6361:20042577

We present results of a multi-filter monitoring campaign for very low mass (VLM) stars in the Pleiades. Simultaneous to our I-band time series (Scholz & Eisloeffel 2004), which delivered photometric periods for nine VLM stars, we obtained light curves in the J- and H-band. One VLM star with M~0.15 Ms (BPL129) shows a period in all three wavelength bands. The amplitudes in I, J, and H are 0.035, 0.035, and 0.032 mag. These values are compared to simulations, in which we compute the photometric amplitude as a function of spot temperature and filling factor. The best agreement between observations and models is found for cool spots with a temperature contrast of 18-31% and a very low surface filling factor of 4-5%. We suggest that compared to more massive stars VLM objects may have either very few spots or a rather symmetric spot distribution. This difference might be explained with a change from a shell to a distributed dynamo in the VLM regime.

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