标题： 非常低质量的 Lupus 3 星云成员 显示英文标题

标题： Very low-mass members of the Lupus 3 cloud

摘要： 我们报告了利用ESO/MPG 2.2米望远镜上的宽视场成像仪（WFI）在智利拉西拉天文台（La Silla Observatory）对 Lupus 3 星云中极低质量恒星和褐矮星的多波段巡天结果。 我们的多波段光学测光数据与现有的 2MASS JHK 测光数据相结合，确认了 19 颗新的年轻恒星和 3 颗可能属于该恒星形成区的褐矮星候选体。我们的目标天体大多集中在云核周围。恒星和褐矮星表现出相似程度的 H-alpha 发射线，这可能是吸积活动的标志。一颗褐矮星候选体表现出近红外过量辐射，可能表明存在一个盘状结构，但由于其在光学波段的微弱性，无法确认其 H-alpha 发射线。我们还发现了两对可能属于 Lupus 3 的视觉双星，它们可能是宽距双星系统。 显示英文摘要

摘要： We report on a multi-band survey for very low-mass stars and brown dwarfs in the Lupus 3 cloud with the Wide Field Imager (WFI) at the ESO/MPG 2.2m telescope on La Silla Observatory (Chile). Our multiband optical photometry is combined with available 2MASS JHK photometry to identify 19 new young stars and 3 brown dwarf candidates as probable members of this star forming region. Our objects are mostly clustered around the cloud core. Stars and brown dwarfs have similar levels of H-alpha emission, probably a signature of accretion. One object, a brown dwarf candidate, exhibits a near-infrared excess, which may indicate the presence of a disk, but its H-alpha emission cannot be confirmed due to its faintness in the optical passbands. We also find two visual pairs of probable Lupus 3 members that may be wide binaries.