Principe, D. A.D. A.PrincipeSACCO, GIUSEPPE GERMANOGIUSEPPE GERMANOSACCOKastner, J. H.J. H.KastnerWilner, D.D.WilnerSTELZER, BEATEBEATESTELZERMICELA, GiuseppinaGiuseppinaMICELA2020-09-112020-09-1120170004-6361http://hdl.handle.net/20.500.12386/27323We present Chandra X-ray Observatory and Submillimeter Array (SMA) imaging of <ASTROBJ>HBC 515</ASTROBJ>, a system consisting of multiple young stellar objects (YSOs). The five members of HBC 515 represent a remarkably diverse array of YSOs, ranging from the low-mass Class I/II protostar <ASTROBJ>HBC 515B</ASTROBJ>, through Class II and transition disk objects (<ASTROBJ>HBC 515D</ASTROBJ> and C, respectively), to the "diskless", intermediate-mass, pre-main sequence (pre-MS) binary HBC 515A. Our Chandra/ACIS imaging establishes that all five components are X-ray sources, with <ASTROBJ>HBC 515A</ASTROBJ> - a subarcsecond-separation binary that is partially resolved by Chandra - being the dominant X-ray source. We detect an X-ray flare associated with HBC 515B. In the SMA imaging, HBC 515B is detected as a strong 1.3 mm continuum emission source; a second, weaker mm continuum source is coincident with the position of the transition disk object <ASTROBJ>HBC 515C</ASTROBJ>. These results strongly support the protostellar nature of HBC 515B, and firmly establish HBC 515A as a member of the rare class of relatively massive, X-ray luminous weak-lined T Tauri stars that are binaries and have shed their disks at very early stages of pre-MS evolution. The coexistence of two such disparate objects within a single, presumably coeval multiple YSO system highlights the influence of pre-MS star mass, binarity, and X-ray luminosity in regulating the lifetimes of circumstellar, planet-forming disks, and the timescales of star-disk interactions.STAMPAenArticle10.1051/0004-6361/2016295452-s2.0-85010441823000394465000008http://arxiv.org/abs/1610.03851v1https://www.aanda.org/articles/aa/abs/2017/02/aa29545-16/aa29545-16.html2017A&A...598A...8PFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation