EPoS Contribution
EPoS Contribution
The mass function and mass segregation in Alpha Persei open cluster

Maryam Hasheminia
IASBS, Esfahan, IR
We present the results of wide field Infrared and near-infrared survey of 3.3 deg around the Alpha Persei cluster center. We remove non-cluster contamination on the basis of proper motions and J and K photometry of PPMXL catalogue and W1 and W2 photometry from the WISE survey and present 810 candidates cluster members down to m = 0.1 Msol. We derived the global and radial present-day mass function (MF) of the cluster and found that they are well matched by a two-stage power-law. The global MF of Alpha Persei shows a turnover at m = 0.62 Msol with low and high-mass slopes of alpha_low = 0.50 ± 0.09 (0.1 < m/Msol < 0.62) and alpha_high = 2.32 ± 0.14 (0.62 < m/Msol < 4.68) respectively. The high-mass slope of the cluster increases from 2.01 inside 1.10 deg to 2.63 outside 2.2 deg, whereas the mean stellar mass decreases from 0.95 to 0.57 Msol in the same regions, signifying clear evidence of mass segregation in the cluster.
Caption: The MF of Alpha Persei after correction for contaminants as found by our study as well as other studies. The vertical dashed line marks the MF turnover, i.e. mt = 0.62 Msol. The MF of low- and high-mass stars have power-law slopes of 0.50 ± 0.09 and 2.32 ± 0.14 respectively.
N. Sheikhi, IASBS, IR
P. Khalaj, UQ, AU
H. Haghi, IASBS, IR
A.H. Zonoozi, IASBS, IR
H. Baumgardt, UQ, AU
Key publication

Suggested Session: Cluster Formation