Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1660s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1660-1663.
Astronomy and Astrophysics
Astronomy
15
Main Sequence Stars, Sky Surveys (Astronomy), Stellar Coronas, Stellar Spectra, Stellar Winds, X Ray Sources, Chromosphere, Stellar Magnetic Fields, Stellar Temperature, X Ray Astronomy
Scientific paper
We have undertaken a deep X-ray imaging survey of single, normal, mid-to-late-A- and early-F-type main-sequence stars using the ROSA T PSPC. Eight of the nine such stars in our fields went undetected at very weak emission levels, with upper limits on the normalized X-ray flux in each case of better than log R(x) below -6.3. The only A-F star we detected was 83 Tau, a member of the Hyades that we now belatedly recognize as a possible binary star, whose emission may come from an unidentified companion. Our observations reveal a systematic decline in coronal X-ray brightness with increasing effective temperature, which we attribute to the presence of strong coronal winds. These new results add further weight to earlier suggestions that single A and early-F stars in the field and in nearby older open clusters generally have intrinsically faint coronae.
Drake Stephen Alan
Simon Theodore
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