太阳圈内疏散星团的生存：Teutsch145和Teutsch146
Open cluster survival within the solar circle: Teutsch145 and Teutsch146
摘要：
Teutsch 145和Teutsch 146被证明是疏散星团（OC），它们在太阳圈内运行良好，在太阳圈内，几个动力学过程结合在一起，在几个10 ^8年的时间尺度上破坏了大多数OC。BVI测光从伽利略望远镜被用来调查的性质，并得出的基本和结构参数的光学微弱和知之甚少的OCs Teutsch 145和146。这些参数是通过场星净化色星等图（CMD）和恒星径向密度剖面（RDPs）计算的。团簇质量的估计是基于固有质量函数（MFs）。我们得出Teutsch 145和146的年龄分别为200+/-5000万年和400+/-10000万年，距离太阳的距离分别为2.7+/-0.3kpc和3.8+/-0.2kpc。它们的综合视星等和绝对星等分别为m_V ~ 12.4、m_V ~ 13.3、M_V ~- 5.6和M_V ~- 5.3。MFs（在m> 1 Msun的恒星中检测到）的斜率与Salpeter的IMF相似。外推到氢燃烧极限，MF将产生约1400 Msun的总恒星质量，这是相对大质量的OC的典型。这两个OC都位于银河系内部深处，靠近十字盾臂，由于星团破裂过程很重要，它们的原始质量一定比现在的值高。在两个RDP的最内层观测到的显著的恒星密度过剩可能反映了由几个10^8年的外部潮汐应力引起的动力学效应。
英文摘要：
Teutsch145 and Teutsch146 are shown to be open clusters (OCs) orbiting well inside the Solar circle, a region where several dynamical processes combine to disrupt most OCs on a time-scale of a few 10^8yrs. BVI photometry from the GALILEO telescope is used to investigate the nature and derive the fundamental and structural parameters of the optically faint and poorly-known OCs Teutsch145 and 146. These parameters are computed by means of field-star decontaminated colour-magnitude diagrams (CMDs) and stellar radial density profiles (RDPs). Cluster mass estimates are made based on the intrinsic mass functions (MFs). We derive the ages 200+100-50Myr and 400+/-100Myr, and the distances from the Sun 2.7+/-0.3kpc and 3.8+/-0.2kpc, respectively for Teutsch145 and 146. Their integrated apparent and absolute magnitudes are m_V ~ 12.4, m_V ~ 13.3, M_V ~- 5.6 and M_V ~- 5.3. The MFs (detected for stars with m>1Msun) have slopes similar to Salpeter's IMF. Extrapolated to the H-burning limit, the MFs would produce total stellar masses of ~1400Msun, typical of relatively massive OCs. Both OCs are located deep into the inner Galaxy and close to the Crux-Scutum arm. Since cluster-disruption processes are important, their primordial masses must have been higher than the present-day values. The conspicuous stellar density excess observed in the innermost bin of both RDPs might reflect the dynamical effects induced by a few 10^8yrs of external tidal stress.
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