Activity in late-type stars. VI - Optical photometry and UV spectroscopy of the active dMe star, FK Aquarii in late 1983

Details Activity in late-type stars. VI - Optical photometry and UV spectroscopy of the active dMe star, FK Aquarii in late 1983 Activity in late-type stars. VI - Optical photometry and UV spectroscopy of the active dMe star, FK Aquarii in late 1983

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..455b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 455-460.

Astronomy and Astrophysics

Astrophysics

4

Dwarf Stars, Flare Stars, Late Stars, M Stars, Stellar Activity, Stellar Spectrophotometry, Ultraviolet Spectroscopy, Iue, Light Curve, Stellar Atmospheres, Ubv Spectra

Scientific paper

Optical photometry and UV spectroscopy are reported for the flare/BY Dra star FK Aqr from 1983. These data are used to derive the rate of optical energy release in U-band flaring and compare it to four previous epochs. No conclusive evidence of any variation in this rate over an 8-yr interval has been found. No measurable BY Dra variations were present, but a comparison with the mean magnitude in 1979 suggests that spots were present in 1983, but were uniformly distributed in longitude. A comparison of transition-region line fluxes with those recorded in 1979 does not indicate any large changes, but the chromospheric Mg II line flux is smaller by about 25 percent.

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