Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS

P. F. Wang; W. P. Chen; C. C. Lin; A. K. Pandey; C. K. Huang; N. Panwar; C. H. Lee; M. F. Tsai; C. H. Tang; B. Goldman; W. S. Burgett; K. C. Chambers; P. W. Draper; H. Flewelling; T. Grav; J. N. Heasley; K. W. Hodapp; M. E. Huber; R. Jedicke; N. Kaiser; R. P. Kudritzki; G. A. Luppino; R. H. Lupton; E. A. Magnier; N. Metcalfe; D. G. Monet; J. S. Morgan; P. M. Onaka; P. A. Price; C. W. Stubbs; W. Sweeney; J. L. Tonry; R. J. Wainscoat; C. Waters

doi:10.1088/0004-637X/784/1/57

Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS

P. F. Wang, W. P. Chen, C. C. Lin, A. K. Pandey, C. K. Huang, N. Panwar, C. H. Lee, M. F. Tsai, C. H. Tang, B. Goldman, W. S. Burgett, K. C. Chambers, P. W. Draper, H. Flewelling, T. Grav, J. N. Heasley, K. W. Hodapp, M. E. Huber, R. Jedicke, N. KaiserR. P. Kudritzki, G. A. Luppino, R. H. Lupton, E. A. Magnier, N. Metcalfe, D. G. Monet, J. S. Morgan, P. M. Onaka, P. A. Price, C. W. Stubbs, W. Sweeney, J. L. Tonry, R. J. Wainscoat, C. Waters

Astrophysical Sciences

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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 ∼0.11-2.4 M_⊙, 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.

Original language	English (US)
Article number	57
Journal	Astrophysical Journal
Volume	784
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/784/1/57
State	Published - Mar 20 2014

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

open clusters and associations: individual (Praesepe)
stars: kinematics and dynamics
stars: luminosity function, mass function

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10.1088/0004-637X/784/1/57

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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., ... Waters, C. (2014). Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS. Astrophysical Journal, 784(1), Article 57. https://doi.org/10.1088/0004-637X/784/1/57

@article{878e9ead343447088905036870b73c8a,

title = "Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS",

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 ∼0.11-2.4 M⊙, 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.",

keywords = "open clusters and associations: individual (Praesepe), stars: kinematics and dynamics, stars: luminosity function, mass function",

author = "Wang, {P. F.} and Chen, {W. P.} and Lin, {C. C.} and Pandey, {A. K.} and Huang, {C. K.} and N. Panwar and Lee, {C. H.} and Tsai, {M. F.} and Tang, {C. H.} and B. Goldman and Burgett, {W. S.} and Chambers, {K. C.} and Draper, {P. W.} and H. Flewelling and T. Grav and Heasley, {J. N.} and Hodapp, {K. W.} and Huber, {M. E.} and R. Jedicke and N. Kaiser and Kudritzki, {R. P.} and Luppino, {G. A.} and Lupton, {R. H.} and Magnier, {E. A.} and N. Metcalfe and Monet, {D. G.} and Morgan, {J. S.} and Onaka, {P. M.} and Price, {P. A.} and Stubbs, {C. W.} and W. Sweeney and Tonry, {J. L.} and Wainscoat, {R. J.} and C. Waters",

year = "2014",

month = mar,

day = "20",

doi = "10.1088/0004-637X/784/1/57",

language = "English (US)",

volume = "784",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Wang, PF, Chen, WP, Lin, CC, Pandey, AK, Huang, CK, Panwar, N, Lee, CH, Tsai, MF, Tang, CH, Goldman, B, Burgett, WS, Chambers, KC, Draper, PW, Flewelling, H, Grav, T, Heasley, JN, Hodapp, KW, Huber, ME, Jedicke, R, Kaiser, N, Kudritzki, RP, Luppino, GA, Lupton, RH, Magnier, EA, Metcalfe, N, Monet, DG, Morgan, JS, Onaka, PM, Price, PA, Stubbs, CW, Sweeney, W, Tonry, JL, Wainscoat, RJ & Waters, C 2014, 'Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS', Astrophysical Journal, vol. 784, no. 1, 57. https://doi.org/10.1088/0004-637X/784/1/57

TY - JOUR

T1 - Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS

AU - Wang, P. F.

AU - Chen, W. P.

AU - Lin, C. C.

AU - Pandey, A. K.

AU - Huang, C. K.

AU - Panwar, N.

AU - Lee, C. H.

AU - Tsai, M. F.

AU - Tang, C. H.

AU - Goldman, B.

AU - Burgett, W. S.

AU - Chambers, K. C.

AU - Draper, P. W.

AU - Flewelling, H.

AU - Grav, T.

AU - Heasley, J. N.

AU - Hodapp, K. W.

AU - Huber, M. E.

AU - Jedicke, R.

AU - Kaiser, N.

AU - Kudritzki, R. P.

AU - Luppino, G. A.

AU - Lupton, R. H.

AU - Magnier, E. A.

AU - Metcalfe, N.

AU - Monet, D. G.

AU - Morgan, J. S.

AU - Onaka, P. M.

AU - Price, P. A.

AU - Stubbs, C. W.

AU - Sweeney, W.

AU - Tonry, J. L.

AU - Wainscoat, R. J.

AU - Waters, C.

PY - 2014/3/20

Y1 - 2014/3/20

N2 - 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 ∼0.11-2.4 M⊙, 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.

AB - 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 ∼0.11-2.4 M⊙, 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.

KW - open clusters and associations: individual (Praesepe)

KW - stars: kinematics and dynamics

KW - stars: luminosity function, mass function

UR - http://www.scopus.com/inward/record.url?scp=84896755070&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84896755070&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/784/1/57

DO - 10.1088/0004-637X/784/1/57

M3 - Article

AN - SCOPUS:84896755070

SN - 0004-637X

VL - 784

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 57

ER -

Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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