Further Results of TiO-Band Observations of Starspots

Details Further Results of TiO-Band Observations of Starspots Further Results of TiO-Band Observations of Starspots

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128.1802o&link_type=abstract

The Astronomical Journal, Volume 128, Issue 4, pp. 1802-1811.

Astronomy and Astrophysics

Astronomy

21

Stars: Activity, Stars: Atmospheres, Stars: Spots, Techniques: Spectroscopic

Scientific paper

We present measurements of starspot parameters (temperature and filling factor) on five highly active stars, using absorption bands of TiO, from observations made between 1998 March and 2001 December. We determined starspot parameters by fitting TiO bands using spectra of inactive G and K stars as proxies for the unspotted photospheres of the active stars and spectra of M stars as proxies for the spots. For three evolved RS CVn systems, we find spot filling factors between 0.28 and 0.42 for DM UMa, 0.22 and 0.40 for IN Vir, and 0.31 and 0.35 for XX Tri; these values are similar to those found by other investigators using photometry and Doppler imaging. Among active dwarfs, we measured a lower spot temperature (3350 K) for EQ Vir than found in a previous study of TiO bands, and for EK Dra a lower spot temperature (~3800 K) than found through photometry. For all active stars but XX Tri, we achieved good phase coverage through a stellar rotational period. We also present our final, extensive grid of spot and nonspot proxy stars.
This paper includes data taken at McDonald Observatory of the University of Texas at Austin.

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