Chandra and Spitzer Observations Reveal New YSOs in the Heart of Trumpler 37

摘要: We have discovered 22 new low-mass members in the center of 4 Myr old open cluster Trumpler 37 (Tr 37) using archival Chandra and Spitzer data. Our use ACIS data an improved reduction Infrared Array Camera central region Tr led to discovery three disk-bearing members, 19 diskless potentially 10 more infrared excess sources. Combining these with previous known we measured a disk frequency ~39%, which is lower than previously reported ~48%. Most are stars that lie within 0.65 pc massive O6.5V star HD 206267. The proximity sources HD 206267 suggests photoevaporation may be accelerating evolution 37. solar-type masses ranging from ~0.6 M ☉ 1.8 ☉, spectral types late early K, X-ray luminosities range 29.3 erg s-1 ≤ log L X 31.9 s-1. median luminosity (L ~ 3 × 1030 s–1) this intermediate-aged on same level as younger (1-3 Myr) slightly older (5 Myr) populations mass range, age-activity relation for pre-main-sequence solar-mass constant up ~5 Myr decays sometime thereafter.