Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253...47c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 47-54.
Astronomy and Astrophysics
Astronomy
1
Emission Spectra, Flare Stars, Pre-Main Sequence Stars, Stellar Spectra, Absorption Spectra, Balmer Series, Chromosphere, Spectral Line Width
Scientific paper
Optical spectra of quiescent premain-sequence flare stars in Orion are presented. The spectra cover about 3600-4600 A at about 3 A resolution, and were taken using an optical fiber-fed spectrograph. The spectra reveal that most of the stars have Ca II H and K and the Balmer lines in emission, and approximate surface fluxes for these lines are deduced, along with Ca I absorption equivalent widths. The observed stars fall into four distinct types, according to the strength of the emission line spectrum. Most of the stars are weak-line T Tauri stars, and are similar in appearance to dMe stars. Analysis of the line fluxes and equivalent widths show systematic variations across the stellar sample. An observed sequence, of declining emission line flux for progressively cooler stars in the sample, is interpreted as due to decreasing chromospheric emission. This sequence may represent a saturation limit in flux, analogous to a trend observed for main-sequence stars, and suggests the Orion flare stars possess plage-dominated chromospheres.
Carter Brad D.
O'Mara B. J.
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