Cool Stars 14 - Submitted Abstract # 33
This version created on 05 October 2006

A new Doppler image of the weak-line T Tauri star V410  Tauri


Tobias Schmidt, Astrophysikalisches Institut (AIU) Jena Germany
Artie P. Hatzes, Thueringer Landessternwarte Tautenburg (TLS) Germany
Eike Guenther, Thueringer Landessternwarte Tautenburg (TLS) Germany
Christoph Ries, Universitats-Sternwarte Muenchen Germany
Michael Hartmann, Thueringer Landessternwarte Tautenburg (TLS) Germany
Johannes M. Ohlert, Astronomie Stiftung Trebur Germany
Holger Lehmann, Thueringer Landessternwarte Tautenburg (TLS) Germany

To create a new Doppler image of the spot distribution of V410  Tauri
13 spectra were taken at different rotational phases of the
approximately 1.872 days period of the weak-line T Tauri star.  The
data were acquired on 13 nights spanning 128 days in late 2004 and
early 2005 using the Coude Echelle Spectrograph of the Thueringer
Landessternwarte Tautenburg 2m telescope and a 2000  x 2000  CCD
detector.  A wavelength coverage of 4750  - 7070  A was obtained.
Furthermore photometry has been measured simultaneously with MONICA at
the 80  cm telescope at Wendelstein Observatory.  A Doppler image was
derived using a Maximum Entropy method and several photospheric
absorption lines, like e.g.  the Ca I line at 6439.1 A.  All images
calculated show a spot distribution dominated by a high-latitude spot.
This spot seems to be long-lived because it already appears in Doppler
images from data taken in 1990  by Joncour et al., in 1992 by
Strassmeier et al.  and in 1993/1994 by Hatzes.  The photometry is
used to compare it to an artificial light curve derived from the
calculated Doppler image to check the quality of the resulting image,
while the Doppler image itself is of course compared to previous
images.  Moreover the photometry is taken to investigate if there
still is a tentative cycle in the mean V band magnitude with a length
of 5.4 yr which was found by Stelzer et al.  in 2003 and supposed to
be the first tentative detection of an activity cycle on a PMS star.

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