J/ApJ/784/57 Photometry and proper motions in Praesepe (Wang+, 2014)
Characterization of the Praesepe star cluster by photometry and proper motions
with 2MASS, PPMXL, and Pan-STARRS.
Wang P.F., Chen W.P., Lin C.C., Pandey A.K., Huang C.K., Panwar N.,
Lee C.H., Tsai M.F., Tang C.-H., Goldman B., Burgett W.S., Chambers K.C.,
Draper P.W., Flewelling H., Grav T., Heasley J.N., Hodapp K.W., Huber M.E.,
Jedicke R., Kaiser N., Kudritzki R.-P., Luppino G.A., Lupton R.H.,
Magnier E.A., Metcalfe N., Monet D.G., Morgan J.S., Onaka P.M., Price P.A.,
Stubbs C.W., Sweeney W., Tonry J.L., Wainscoat R.J., Waters C.
<Astrophys. J., 784, 57 (2014)>
=2014ApJ...784...57W 2014ApJ...784...57W (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, ugriz ; Photometry, infrared ;
Proper motions
Keywords: open clusters and associations: individual: Praesepe -
stars: kinematics and dynamics -
stars: luminosity function, mass function
Abstract:
Membership identification is the first step in determining the
properties of a star cluster. Low-mass members in particular could be
used to trace the dynamical history, such as mass segregation, stellar
evaporation, or tidal stripping, of a star cluster in its Galactic
environment. We identified member candidates of the intermediate-age
Praesepe cluster (M44) with stellar masses ∼0.11-2.4M☉, using
Panoramic Survey Telescope And Rapid Response System and Two Micron
All Sky Survey photometry, and PPMXL proper motions. Within a sky area
of 3° radius, 1040 candidates are identified, of which 96 are new
inclusions. Using the same set of selection criteria on field stars,
an estimated false positive rate of 16% was determined, suggesting
that 872 of the candidates are true members. This most complete and
reliable membership list allows us to favor the BT-Settl model over
other stellar models. The cluster shows a distinct binary track above
the main sequence, with a binary frequency of 20%-40%, and a high
occurrence rate of similar mass pairs. The mass function is consistent
with that of the disk population but shows a deficit of members below
0.3 solar masses. A clear mass segregation is evidenced, with the
lowest-mass members in our sample being evaporated from this
disintegrating cluster.
Description:
Data used in this study include photometry and proper motion
measurements within a 5° radius around the Praesepe center
(R.A.=08h40m, decl.=+19°42', J2000). Archival data were taken
from the 2MASS Point Sources Catalog (2MASS; cat. II/246), PPMXL
(Roeser et al. 2010, cat. I/317), and Panoramic Survey Telescope And
Rapid Response (Pan-STARRS).
Pan-STARRS is a wide-field (7deg2) imaging system, with a 1.8m,
f/4.4 telescope, equipped with a 1.4 giga-pixel camera. The prototype
(PS1), located atop Haleakala, Maui, USA, has been patrolling the
entire sky north of -30° declination since mid-2010 with a
combination of gP1, rP1, iP1, zP1, and yP1 bands. The PS1
filters differ slightly from those of the SDSS. The gP1 filter
extends 20nm redward of gSDSS for greater sensitivity and lower
systematics for photometric redshift estimates. SDSS has no
corresponding y filter (Tonry et al. 2012, cat. J/ApJ/750/99).
Upon the completion of its 3.5yr mission by early 2014, PS1 will
provide reliable photometry and astrometry.
Table1 lists the properties of the 1040 candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 156 1040 Member candidates of Praesepe
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
I/317 : The PPMXL Catalog (Roeser+ 2010)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
I/257 : Proper Motions in Praesepe (Wang+, 1995)
J/A+A/559/A43 : Pan-STARRS1 observations of the Hyades (Goldman+, 2013)
J/MNRAS/434/3236 : Masses of Praesepe members (Khalaj+, 2013)
J/MNRAS/432/62 : PS1 MDS X-ray selected galaxy clusters (Ebeling+, 2013)
J/MNRAS/426/3419 : UKIDSS GCS Praesepe members (Boudreault+, 2012)
J/ApJ/756/L33 : RVs of 2 hot Jupiters in Praesepe (Quinn+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/AJ/142/77 : New T dwarfs identified in Pan-STARRS 1 (Deacon+, 2011)
J/A+A/510/A27 : Very low mass stars in Praesepe (Boudreault+, 2010)
J/MNRAS/408/2457 : Low-mass stars and brown dwarfs in Praesepe (Baker+, 2010)
J/ApJ/697/1578 : A debris disk study of Praesepe (Gaspar+, 2009)
J/AJ/135/907 : Variables in Praesepe identified with KELT (Pepper+, 2008)
J/AJ/134/2340 : Membership of Praesepe and Coma Berenices (Kraus+, 2007)
J/AJ/132/1517 : Spectroscopy of M dwarfs in Praesepe (Kafka+, 2006)
J/MNRAS/342/1241 : Low-mass stars in M45 and M44 (Pinfield+, 2003)
J/AZh/80/8 : Proper motions of open star clusters (Loktin+, 2003)
J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002)
J/AJ/123/1570 : alpha Persei and Praesepe Clusters (Patience+, 2002)
J/A+A/375/989 : JHK photometry of Praesepe low-mass stars (Bouvier+, 2001)
J/A+A/354/881 : RVs of Praesepe & Hyades Am stars (Debernardi+ 2000)
J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999)
J/A+AS/129/9 : Delta Sct stars in Praesepe (Pena+ 1998)
J/A+AS/109/29 : Very low mass stars in Praesepe (Hambly+, 1995)
J/A+A/298/115 : ROSAT study of Praesepe (Randish+, 1995)
J/AJ/109/1379 : Praesepe + M 67 spectral standards (Allen+ 1995)
J/AJ/106/1080 : Lithium in Praesepe (Soderblom+, 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/1040] Running sequence number
6- 14 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
16- 24 F9.6 deg DEdeg Declination in decimal degrees (J2000)
26- 30 F5.1 mas/yr pmRA [-45.4/-27.6] Proper motion along RA times
cos(DE) (µαcosδ) (1)
32- 35 F4.1 mas/yr e_pmRA [0.6/10.3] Uncertainty in pmRA (1)
37- 41 F5.1 mas/yr pmDE [-22.4/-5] Proper motion along DE
(µδ) (1)
43- 46 F4.1 mas/yr e_pmDE [0.5/17.1] Uncertainty in pmDE (1)
48- 52 F5.2 mag gmag [6.7/22.4]?=99.00 Pan-STARRS g band magnitude
(gP1) (2)
54- 58 F5.2 mag e_gmag [0/0.6]?=99.00 Uncertainty in gmag
60- 64 F5.2 mag rmag [6.7/22]?=99.00 Pan-STARRS r band magnitude
(rP1) (2)
66- 70 F5.2 mag e_rmag [0/0.6]?=99.00 Uncertainty in rmag
72- 76 F5.2 mag imag [6.8/20.2]?=99.00 Pan-STARRS i band magnitude
(iP1) (2)
78- 82 F5.2 mag e_imag [0/0.6]?=99.00 Uncertainty in imag
84- 88 F5.2 mag zmag [6.9/18.3]?=99.00 Pan-STARRS z band magnitude
(zP1) (2)
90- 94 F5.2 mag e_zmag [0/0.6]?=99.00 Uncertainty in zmag
96-100 F5.2 mag ymag [6.9/18]?=99.00 Pan-STARRS y band magnitude
(yP1) (2)
102-106 F5.2 mag e_ymag [0/0.6]?=99.00 Uncertainty in ymag
108-112 F5.2 mag Jmag [4.69/16.45]?=99.00 2MASS J band magnitude
114-118 F5.2 mag e_Jmag [0/0.24]?=99.00 Uncertainty in Jmag
120-124 F5.2 mag Hmag [4.32/16.06]?=99.00 2MASS H band magnitude
126-130 F5.2 mag e_Hmag [0/10]?=99.00 Uncertainty in Hmag
132-136 F5.2 mag Kmag [4.18/15.8]?=99.00 2MASS Ks band magnitude
138-142 F5.2 mag e_Kmag [0/10]?=99.00 Uncertainty in Kmag
144 I1 --- B [0/1] Binary system? (1=possible, or 0=not)
146-156 A11 --- Name Common source identifier, if any
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Note (1): Taken from the PPMXL catalog (Roeser et al. 2010, cat. I/317).
Note (2): The filters of the Panoramic Survey Telescope And Rapid Response
System (Pan-STARRS) prototype (PS1) differ slightly from those of the SDSS.
The gP1 filter extends 20nm redward of gSDSS for greater sensitivity
and lower systematics for photometric redshift estimates. SDSS has no
corresponding y filter (Tonry et al. 2012, cat. J/ApJ/750/99). The limiting
magnitudes are gP1∼22.5mag, rP1∼22mag, iP1∼21.5mag, zP1∼21mag, and
yP1∼19.5mag, with the saturation limit of ∼14mag. PS1 photometry for each
detected object has measurements at multiple epochs, but for the work
reported here only the average magnitude is used.
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 01-Aug-2016