Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831

Basílio X. Santiago; Leandro Kerber; Rodrigo Castro; Mark Wilkinson; Richard de Grijs; Rachel Johnson; Gerry Gilmore; Sylvie Beaulieu

Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831

Basílio X. Santiago, Leandro Kerber, Rodrigo Castro, Mark Wilkinson, Richard de Grijs, Rachel Johnson, Gerry Gilmore, Sylvie Beaulieu

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

43 Citations (Scopus)

Abstract

We present a preliminary analysis of a deep colour-magnitude diagram of NGC 1831, a rich cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W and F814W filters, reaching m(555) similar or equal to 25 mag. Efficient use of the two-dimensional distribution of data was made by comparing the observed colour-magnitude diagram with model ones. We discuss the process used in accounting for field star contamination and sampling incompleteness in the data. We also describe the algorithm used in building artificial diagrams from model isochrones and the statistical method used in comparing model and data colour-magnitude diagrams. From these comparisons we infer a metallicity Z = 0.008 and a low value, f(bin) similar or equal to 0.25, for the global binary fraction of NGC 1831. We also rule out ages T less than or equal to 500 Myr and mass function slope values a greater than or equal to 2.

Original language	English
Title of host publication	Extragalactic star clusters
Subtitle of host publication	proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001
Editors	Doug Geisler, Eva K. Grebel, Dante Minniti
Place of Publication	San Francisco, CA
Publisher	Astronomical Society of the Pacific
Pages	525-530
Number of pages	6
ISBN (Print)	158381115X
Publication status	Published - 2002
Externally published	Yes
Event	Symposium on Extragalactic Star Clusters - PUCON, Chile Duration: 12 Mar 2001 → 16 Mar 2001

Publication series

Name	International Astronomical Union. Symposium
Publisher	Astronomical Society of the Pacific
Volume	207

Conference

Conference	Symposium on Extragalactic Star Clusters
Country	Chile
City	PUCON
Period	12/03/01 → 16/03/01

Cite this

Santiago, B. X., Kerber, L., Castro, R., Wilkinson, M., de Grijs, R., Johnson, R., Gilmore, G., & Beaulieu, S. (2002). Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831. In D. Geisler, E. K. Grebel, & D. Minniti (Eds.), Extragalactic star clusters: proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001 (pp. 525-530). (International Astronomical Union. Symposium; Vol. 207). Astronomical Society of the Pacific.

Santiago, Basílio X. ; Kerber, Leandro ; Castro, Rodrigo ; Wilkinson, Mark ; de Grijs, Richard ; Johnson, Rachel ; Gilmore, Gerry ; Beaulieu, Sylvie. / Analysis of colour-magnitude diagrams of rich LMC clusters : NGC 1831. Extragalactic star clusters: proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001. editor / Doug Geisler ; Eva K. Grebel ; Dante Minniti. San Francisco, CA : Astronomical Society of the Pacific, 2002. pp. 525-530 (International Astronomical Union. Symposium).

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title = "Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831",

abstract = "We present a preliminary analysis of a deep colour-magnitude diagram of NGC 1831, a rich cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W and F814W filters, reaching m(555) similar or equal to 25 mag. Efficient use of the two-dimensional distribution of data was made by comparing the observed colour-magnitude diagram with model ones. We discuss the process used in accounting for field star contamination and sampling incompleteness in the data. We also describe the algorithm used in building artificial diagrams from model isochrones and the statistical method used in comparing model and data colour-magnitude diagrams. From these comparisons we infer a metallicity Z = 0.008 and a low value, f(bin) similar or equal to 0.25, for the global binary fraction of NGC 1831. We also rule out ages T less than or equal to 500 Myr and mass function slope values a greater than or equal to 2.",

author = "Santiago, {Bas{\'i}lio X.} and Leandro Kerber and Rodrigo Castro and Mark Wilkinson and {de Grijs}, Richard and Rachel Johnson and Gerry Gilmore and Sylvie Beaulieu",

year = "2002",

language = "English",

isbn = "158381115X",

series = "International Astronomical Union. Symposium",

publisher = "Astronomical Society of the Pacific",

pages = "525--530",

editor = "Doug Geisler and Grebel, {Eva K.} and Dante Minniti",

booktitle = "Extragalactic star clusters",

note = "Symposium on Extragalactic Star Clusters ; Conference date: 12-03-2001 Through 16-03-2001",

}

Santiago, BX, Kerber, L, Castro, R, Wilkinson, M, de Grijs, R, Johnson, R, Gilmore, G & Beaulieu, S 2002, Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831. in D Geisler, EK Grebel & D Minniti (eds), Extragalactic star clusters: proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001. International Astronomical Union. Symposium, vol. 207, Astronomical Society of the Pacific, San Francisco, CA, pp. 525-530, Symposium on Extragalactic Star Clusters, PUCON, Chile, 12/03/01.

Analysis of colour-magnitude diagrams of rich LMC clusters : NGC 1831. / Santiago, Basílio X.; Kerber, Leandro; Castro, Rodrigo; Wilkinson, Mark; de Grijs, Richard; Johnson, Rachel; Gilmore, Gerry; Beaulieu, Sylvie.

Extragalactic star clusters: proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001. ed. / Doug Geisler; Eva K. Grebel; Dante Minniti. San Francisco, CA : Astronomical Society of the Pacific, 2002. p. 525-530 (International Astronomical Union. Symposium; Vol. 207).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

TY - GEN

T1 - Analysis of colour-magnitude diagrams of rich LMC clusters

T2 - Symposium on Extragalactic Star Clusters

AU - Santiago, Basílio X.

AU - Kerber, Leandro

AU - Castro, Rodrigo

AU - Wilkinson, Mark

AU - de Grijs, Richard

AU - Johnson, Rachel

AU - Gilmore, Gerry

AU - Beaulieu, Sylvie

PY - 2002

Y1 - 2002

N2 - We present a preliminary analysis of a deep colour-magnitude diagram of NGC 1831, a rich cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W and F814W filters, reaching m(555) similar or equal to 25 mag. Efficient use of the two-dimensional distribution of data was made by comparing the observed colour-magnitude diagram with model ones. We discuss the process used in accounting for field star contamination and sampling incompleteness in the data. We also describe the algorithm used in building artificial diagrams from model isochrones and the statistical method used in comparing model and data colour-magnitude diagrams. From these comparisons we infer a metallicity Z = 0.008 and a low value, f(bin) similar or equal to 0.25, for the global binary fraction of NGC 1831. We also rule out ages T less than or equal to 500 Myr and mass function slope values a greater than or equal to 2.

AB - We present a preliminary analysis of a deep colour-magnitude diagram of NGC 1831, a rich cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W and F814W filters, reaching m(555) similar or equal to 25 mag. Efficient use of the two-dimensional distribution of data was made by comparing the observed colour-magnitude diagram with model ones. We discuss the process used in accounting for field star contamination and sampling incompleteness in the data. We also describe the algorithm used in building artificial diagrams from model isochrones and the statistical method used in comparing model and data colour-magnitude diagrams. From these comparisons we infer a metallicity Z = 0.008 and a low value, f(bin) similar or equal to 0.25, for the global binary fraction of NGC 1831. We also rule out ages T less than or equal to 500 Myr and mass function slope values a greater than or equal to 2.

M3 - Conference proceeding contribution

SN - 158381115X

T3 - International Astronomical Union. Symposium

SP - 525

EP - 530

BT - Extragalactic star clusters

A2 - Geisler, Doug

A2 - Grebel, Eva K.

A2 - Minniti, Dante

PB - Astronomical Society of the Pacific

CY - San Francisco, CA

Y2 - 12 March 2001 through 16 March 2001

ER -

Santiago BX, Kerber L, Castro R, Wilkinson M, de Grijs R, Johnson R et al. Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831. In Geisler D, Grebel EK, Minniti D, editors, Extragalactic star clusters: proceedings of the 207th Symposium of the IAU held in Pucón, Chile, 12-16 March 2001. San Francisco, CA: Astronomical Society of the Pacific. 2002. p. 525-530. (International Astronomical Union. Symposium).