Abstract
view Abstract Citations (6) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Search for Chromospheres at Faint Magnitudes Fleming, Thomas A. ; Giampapa, Mark S. Abstract The preliminary results of a program to detect chromospheric Ca II K line emission in the faintest dwarf stars yet observed at this wavelength using high spectral resolution are reported. The star LHS 429 (VB 8; dM7e) exhibits K line emission in addition to H-alpha emission while LHS 2 (dM5-5.5) shows K line emission although no apparent H-alpha feature was seen in a spectrum obtained during the course of an earlier study by Giampapa and Liebert. A further seven stars observed did not exhibit any apparent feature at the position of the K line. The upper limits estimated for the K line surface flux in the case of the nondetections are still consistent with these stars having chromospheres characterized by a level of K line emission similar to that of LHS 2. The trend of the measured K line widths with absolute visual magnitude is qualitatively in accord with that expected from the Wilson-Bappu effect. Publication: The Astrophysical Journal Pub Date: November 1989 DOI: 10.1086/168011 Bibcode: 1989ApJ...346..299F Keywords: Chromosphere; Dwarf Stars; Late Stars; Stellar Magnitude; Astronomical Spectroscopy; Emission Spectra; H Alpha Line; Spectral Line Width; Stellar Mass; Astrophysics; STARS: CHROMOSPHERES; STARS: EMISSION-LINE; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (11)
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