The Multiple Pre-Main Sequence System HBC 515 in L1622
نویسندگان
چکیده
The bright pre-main sequence star HBC 515 (HD 288313) located in the L1622 cometary cloud in Orion has been studied extensively with optical/infrared imaging and ultraviolet/optical/infrared spectroscopy. The spectra indicate that HBC 515 is a weakline T Tauri star of spectral type K2V. Adaptive optics imaging in the K-band reveals that HBC 515 is a binary with two equally bright components separated by 0.5. A very faint third component is found 5 to the northwest. Spitzer IRAC and MIPS observations show that at mid-infrared wavelengths this third source dominates the system, suggesting that it is a protostar still embedded in the nascent cloud of HBC 515. The close association of a weakline T Tauri star with a newborn protostar in a multiple system is noteworthy. Two nearby T Tauri stars are likely associated with the HBC 515 multiple system, and the dynamical evolution of the complex that would lead to such a configuration is considered. Subject headings: stars: formation – stars: pre-main sequence – binaries: close – stars: individual (HBC 515) – reflection nebulae – accretion, accretion disks
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تاریخ انتشار 2010