Answers are grounded in this paper and cite their sources.
The active K-type object HD 197890 detected in the ROSAT all-sky survey appears to be one of the most rapidly rotating stars of its type yet found, with a |v| sin i value of |170 ± 20 km s⁻¹|. Preliminary photometric measurements and spectral synthesis of the Li 6707-Å spectral region suggest a premain-sequence evolutionary status, although the derived spectral type of approximately K5 is uncertain at this stage, and further observations are planned.
No takes yet. Share an insight, caveat, or question.
Anders et al. (1993) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: