Activity in late-type stars. VI. Optical photometry and UV spectroscopy of the active dMe star, FK Aquarii in late 1983.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1990
- Bibcode:
- 1990A&A...236..455B
- Keywords:
-
- Dwarf Stars;
- Flare Stars;
- Late Stars;
- M Stars;
- Stellar Activity;
- Stellar Spectrophotometry;
- Ultraviolet Spectroscopy;
- Iue;
- Light Curve;
- Stellar Atmospheres;
- Ubv Spectra;
- Astrophysics