An attempt to use narrow-band H-alpha photometry to estimate levels of stellar activity

Details An attempt to use narrow-band H-alpha photometry to estimate levels of stellar activity An attempt to use narrow-band H-alpha photometry to estimate levels of stellar activity

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jrasc..81...36r&link_type=abstract

Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 81, April 1987, p. 36-43.

Astronomy and Astrophysics

Astronomy

1

H Alpha Line, Narrowband, Stellar Activity, Stellar Spectrophotometry, Spectral Resolution, Stellar Radiation, Stellar Spectra

Scientific paper

Tests were made of a photometric system based on Hα filters with widths 37 and 190 Å. This system is able to detect the activity-related emission component in the line but the detection is at a very low signal-to-noise ratio of about 2. To have an accuracy comparable to the modern spectroscopic determination of Herbig (1985), the narrow filter should be 3 times narrower (about 12 Å) and the measurement error of the Hα index should be reduced from the present 0.003 to no more than 0.002. These requirements would be difficult to obtain simultaneously with the present pair of 50-cm and 60-cm telescopes, even for rather bright stars.

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