SUMMARY OF PROPOSAL 52004
MASS. INSTITUTE OF TECHNOLOGY
77 MASS. AVE.
MA USA 02139
Tel: (617) 253-3875 Fax: (617) 253-0861
ASCA STUDIES OF THE NEAREST REGION OF STAR FORMATION
ABSTRACTRecent studies of the classical T Tauri star (TTS) TW Hya and of five other nearby "isolated TTS" demonstrate that these 6 stars comprise a cloudless TTS association that lies only 30 pc from the Sun. All 6 systems are bright X-ray sources, with X-ray fluxes that are an order of magnitude larger, on average, than the (absorption-corrected) X-ray fluxes of T Tauri stars in well-studied dark clouds like Taurus (D=140 pc). We propose to observe these 6 stars with ASCA, to study high-temperature emission and circumstellar absorption in nearby TTS that are not obscured by cloud material. These observations will provide a new foundation for the intrepretation of X-ray spectra of cloud TTS, as well as new constraints on the rates of X-ray ionization and heating of circumstellar gas.
|CO-I NAME ||INSTITUTE ||COUNTRY |
| ERIC GAIDOS||MIT||USA|
| DAVID WEINTRAUB||VANDERBILT U.||USA|
| BEN ZUCKERMAN||UCLA||USA|
| NORBERT SHULTZ||MIT||USA|
|TARGET NAME||PRI||RA||DEC||TIME||TC||OFF||GIS||SIS CNT||OBS|
|1)TW HYA|| 1||165.4667||-34.7044|| 40 ks||N||Y||P||0.12000||1|
TARGET 1THIS IS THE HIGHEST PRIORITY TARGET FOR THIS PROPOSAL.