Periodic variability in the emission spectrum of T Tauri

Details Periodic variability in the emission spectrum of T Tauri Periodic variability in the emission spectrum of T Tauri

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...511a..13i&link_type=abstract

Astronomy and Astrophysics, Volume 511, id.A13

Astronomy and Astrophysics

Astrophysics

2

Stars: Pre-Main Sequence, Stars: Variables: General

Scientific paper

Context. Long timescale periodic variations in T Tauri stars may be related to changes in their protoplanetary disks. Aims: A lengthy homogeneous series of spectral observations of the CTTS T TauN has been analyzed. Methods: We search for periodicity in the equivalent widths of the emission lines in the optical and in the UV. Results: Significant periodic variation is found in the equivalent widths of Hβ and CaII emission features on a time scale of 33 ± 1.5 days. Variations in the UV emission lines based on archival IUE spectra are also consistent with this period. Conclusions: This is clearly not the rotation period of the star, which is known to be 2.8 days, and must arise somewhere in the magnetosphere, disk or outflow region.

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