Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..517m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 2, p. 517-520
Astronomy and Astrophysics
Astronomy
7
Atmospheric Heating, Extreme Ultraviolet Radiation, Late Stars, Sky Surveys (Astronomy), Stellar Atmospheres, Stellar Convection, Stellar Temperature, Ultraviolet Emission, Extreme Ultraviolet Explorer Satellite, Stellar Coronas, Stellar Rotation
Scientific paper
We present observations of low activity late-type stars obtained with the Extreme Ultraviolet Explorer (EUVE). These stars are the slowest rotators, and acoustic heating may dominate their outer atmospheric heating process. We report detection of EUV emission from the low acitivity K dwarf HD 4628 during the EUVE Deep Survey in the Lexan/boran band. This detection, in conjunction with the non-detection of this object in the ROSAT Position Sensitive Proportional Counter (PSPC) all-sky survey, suggests the existence of a cool corona with a characteristic temperature of less than 106 K. The flux and spectral signature are consistent with current theories of acoustic heating.
Bowyer Stuart
Drake Jeremy J.
Mathioudakis Michail
Schmitt Juergen H. M. M.
Vedder Peter W.
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