J/MNRAS/457/1028 alpha Per cluster possible members (Sheikhi+, 2016)
The binary fraction and mass segregation in Alpha Persei open cluster.
Sheikhi N., Hasheminia M., Khalaj P., Haghi H., Zonoozi A.H., Baumgardt H.
<Mon. Not. R. Astron. Soc., 457, 1028-1036 (2016)>
=2016MNRAS.457.1028S 2016MNRAS.457.1028S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions ; Photometry, infrared ;
Stars, masses
Keywords: binaries: general - stars: luminosity function, mass function -
open clusters and associations: individual: alpha Per -
infrared: stars
Abstract:
We have obtained membership probabilities of stars within a field of
from the centre of the open cluster alpha Persei using proper motions
and photometry from the PPMXL and Wide-field Infrared Survey Explorer
catalogues. We have identified 810 possible stellar members of alpha
Persei. We derived the global and radial present-day mass function
(MF) of the cluster and found that they are well matched by two-stage
power-law relations with different slopes at different radii. The
global MF of alpha Persei shows a turnover at m=0.62M☉ with
low- and high-mass slopes of αlow=0.50±0.09
(0.1<m/M☉<0.62) and αhigh=2.32±0.14
(0.62≤m/M☉<4.68), respectively. The high-mass slope of the
cluster increases from 2.01 inside 110 to 2.63 outside 22, whereas the
mean stellar mass decreases from 0.95 to 0.57M☉ in the same
regions, signifying clear evidence of mass segregation in the cluster.
From an examination of the high-quality colour-magnitude data of the
cluster and performing a series of Monte Carlo simulations, we
obtained a binary fraction of fbin=34±12 per cent for stars with
0.70<m/M☉<4.68. This is significantly larger than the
observed binary fraction, indicating that this open cluster contains a
large population of unresolved binaries. Finally, we corrected the MF
slopes for the effect of unresolved binaries and found low- and
high-mass slopes of αlow=0.89±0.11 and
αhigh=2.37±0.09 and a total cluster mass of 352M☉ for
alpha Persei.
Description:
The present study is based on the PM and JHKs photometric data
extracted from the PPMXL catalogue (Roeser, Demleitner & Schilbach,
2010, Cat. I/317) combined with W1 and W2 magnitudes of the Wide-field
Infrared Survey Explorer (WISE; Wright et al., 2010, Cat. II/311).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 76 810 Celestial coordinates, proper motions, magnitudes
and the masses of the possible members of
alpha Persi as found by this study,
sorted by right ascension from PPMXL
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See also:
I/317 : The PPMXL Catalog (Roeser+ 2010)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004)
J/MNRAS/426/3403 : UKIDSS-GCS α Per members (Lodieu+, 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.6 deg RAdeg Right ascension (J2000)
11- 20 F10.6 deg DEdeg Declination (J2000)
22- 27 F6.3 mag Jmag J magnitude
29- 34 F6.3 mag Ksmag Ks magnitude
36- 40 F5.3 mag e_Jmag rms uncertainty on Jmag
42- 46 F5.3 mag e_Ksmag rms uncertainty on Ksmag
48- 52 F5.1 mas/yr pmRA Proper motion in RA, pmRA*cos(DE)
54- 58 F5.1 mas/yr pmDE Proper Motion in DE
60- 62 F3.1 mas/yr e_pmRA rms uncertainty on pmRA
64- 66 F3.1 mas/yr e_pmDE rms uncertainty on pmDE
68- 72 F5.3 Msun Mass Stellar mass derived from the J magnitude
using a PARSEC isochorne
74- 76 A3 --- Note [DLB -] Note (1)
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Note (1): Whether the star is also found in
D = Deacon & Hambly, 2004, Cat. J/A+A/416/125
L = Lodieu et al., 2012, Cat. J/MNRAS/426/3403
B = members have also been designated by these studies
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Nov-2016