Simultaneous observations of CA II K and MG II K in T Tauri stars

Details Simultaneous observations of CA II K and MG II K in T Tauri stars Simultaneous observations of CA II K and MG II K in T Tauri stars

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..575c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 15, 1985, p. 575-583.

Astronomy and Astrophysics

Astronomy

40

K Lines, Resonance Lines, Stellar Spectra, T Tauri Stars, Ultraviolet Astronomy, Calcium, Iue, Magnesium, Stellar Mass, Stellar Models

Scientific paper

The first simultaneous, calibrated observations of the Ca II K and Mg II k resonance lines in T Tauri stars are presented. It is found that for T Tauri stars with mass greater than 1.5 solar mass, which have radiative cores and tend to be fast rotators, the k line seems to arise in an extended region (probably also responsible for the H-alpha emission), whereas the K line apparently originates closer to the highly inhomogeneous stellar surface. The lower mass stars, which are fully convective and tend to be slow rotators, are more easily described by a largely chromospheric model, consistent with main-sequence activity structures but at greater values of the nonradiative flux. The strongest emission-line stars in the low-mass group, however, are also likely to have extended k line regions.

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