Skip to main content

Constraining the properties of spots on Pleiades very low mass stars

Scholz, A., Eisloffel, J., Froebrich, D. (2005) Constraining the properties of spots on Pleiades very low mass stars. Astronomy and Astrophysics, 438 (2). pp. 675-683. ISSN 0004-6361. (doi:10.1051/0004-6361:20042577) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:49575)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL
http://dx.doi.org/10.1051/0004-6361:20042577

Abstract

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 & Eislöffel 2004b), which delivered photometric periods for nine VLM stars, we obtained light curves in the J- and H-band. One VLM star with M â?? 0.15 Mâ?? (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. © ESO 2005.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361:20042577
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Astron. Astrophys. [Field not mapped to EPrints] AD - Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany [Field not mapped to EPrints] AD - Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland [Field not mapped to EPrints] AD - University of Toronto, Department of Astronomy and Astrophysics, 60 St. George Street, Toronto, M5S 3H8, Canada [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Stars: activity, Stars: low-mass, brown dwarfs, Stars: magnetic fields, Starspots, Computer simulation, Doppler effect, Image analysis, Light emission, Magnetic fields, Magnetism, X rays, Stars: activity, Stars: low-mass, brown dwarfs, Stars: magnetic fields, Starspots, Astrophysics
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Giles Tarver
Date Deposited: 21 Jul 2015 10:24 UTC
Last Modified: 16 Nov 2021 10:20 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49575 (The current URI for this page, for reference purposes)
  • Depositors only (login required):