Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..409m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 409-418. SERC-supported research.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Spectroscopy, Chromosphere, Late Stars, Spectral Bands, Stellar Atmospheres, Balmer Series, Calcium, Dwarf Stars, Titanium Oxides
Scientific paper
Moderate and low resolution spectroscopic observations of late type dwarfs covering a broad range of activity are presented. The strength of the TiO band in 4762 A is used for spectral classification. Calibrated fluxes for the Balmer and the Ca II H and K lines are derived. H-alpha equivalent widths are given for those stars where the line is in absorption as well as those in emission. It is confirmed that stars with no detectable or very weak H-alpha do exist. It is also shown that stars with very weak or no detectable emission in Ca II H and K also exist, this occurring preferentially in late M dwarfs. Although this can be explained in terms of reduced nonradiative heating in the chromosphere, the results cannot be conclusive due to the limited resolution of the data.
Doyle Gerry J.
Mathioudakis Michail
No associations
LandOfFree
Chromospheric diagnostics in late-type stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chromospheric diagnostics in late-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromospheric diagnostics in late-type stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1787249