The Bright Stellar X-Ray Source HD 220140: A Nearby Naked T Tauri Star? Nations, H. L. ; Heckert, P. A. ; Mooney, C. B. ; Summers, D. ; Ratcliff, M. A. ; Marschall, L. A. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: September 1990 Bibcode: 1990BAAS...22.1254N