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Frank Grundahl

Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars. / Brewer, Lauren N.; Sandquist, Eric L.; Mathieu, Robert D.; Milliman, Katelyn; Geller, Aaron M.; Jeffries, Mark W., Jr.; Orosz, Jerome A.; Brogaard, Karsten; Platais, Imants; Bruntt, Hans; Grundahl, Frank; Stello, Dennis; Frandsen, Søren.

In: The Astronomical Journal, Vol. 151, No. 3, 01.03.2016, p. 66.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Brewer, LN, Sandquist, EL, Mathieu, RD, Milliman, K, Geller, AM, Jeffries, MWJ, Orosz, JA, Brogaard, K, Platais, I, Bruntt, H, Grundahl, F, Stello, D & Frandsen, S 2016, 'Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars', The Astronomical Journal, vol. 151, no. 3, pp. 66. https://doi.org/10.3847/0004-6256/151/3/66

APA

Brewer, L. N., Sandquist, E. L., Mathieu, R. D., Milliman, K., Geller, A. M., Jeffries, M. W. . J., Orosz, J. A., Brogaard, K., Platais, I., Bruntt, H., Grundahl, F., Stello, D., & Frandsen, S. (2016). Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars. The Astronomical Journal, 151(3), 66. https://doi.org/10.3847/0004-6256/151/3/66

CBE

Brewer LN, Sandquist EL, Mathieu RD, Milliman K, Geller AM, Jeffries MWJ, Orosz JA, Brogaard K, Platais I, Bruntt H, Grundahl F, Stello D, Frandsen S. 2016. Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars. The Astronomical Journal. 151(3):66. https://doi.org/10.3847/0004-6256/151/3/66

MLA

Vancouver

Brewer LN, Sandquist EL, Mathieu RD, Milliman K, Geller AM, Jeffries MWJ et al. Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars. The Astronomical Journal. 2016 Mar 1;151(3):66. https://doi.org/10.3847/0004-6256/151/3/66

Author

Brewer, Lauren N. ; Sandquist, Eric L. ; Mathieu, Robert D. ; Milliman, Katelyn ; Geller, Aaron M. ; Jeffries, Mark W., Jr. ; Orosz, Jerome A. ; Brogaard, Karsten ; Platais, Imants ; Bruntt, Hans ; Grundahl, Frank ; Stello, Dennis ; Frandsen, Søren. / Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars. In: The Astronomical Journal. 2016 ; Vol. 151, No. 3. pp. 66.

Bibtex

@article{dfbe988e6a534a48b529e0763d6b4ac1,
title = "Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars",
abstract = "As part of our study of the old (˜2.5 Gyr) open cluster NGC 6819 in the Kepler field, we present photometric (Kepler and ground-based BVRCIC) and spectroscopic observations of the detached eclipsing binary WOCS 24009 (Auner 665; KIC 5023948) with a short orbital period of 3.6 days. WOCS 24009 is a triple-lined system, and we verify that the brightest star is physically orbiting the eclipsing binary using radial velocities and eclipse timing variations. The eclipsing binary components have masses MB = 1.090 ± 0.010 M⊙ and MC = 1.075 ± 0.013 M⊙, and radii RB = 1.099 ± 0.006 ± 0.005 R⊙ and RC = 1.069 ± 0.006 ± 0.013 R⊙. The bright non-eclipsing star resides at the cluster turnoff, and ultimately its mass will directly constrain the turnoff mass: our preliminary determination is MA = 1.251 ± 0.057 M⊙. A careful examination of the light curves indicates that the fainter star in the eclipsing binary undergoes a very brief period of total eclipse, which enables us to precisely decompose the light of the three stars and place them in the color-magnitude diagram (CMD). We also present improved analysis of two previously discussed detached eclipsing stars in NGC 6819 (WOCS 40007 and WOCS 23009) en route to a combined determination of the cluster{\textquoteright}s distance modulus (m - M)V = 12.38 ± 0.04. Because this paper significantly increases the number of measured stars in the cluster, we can better constrain the age of the CMD to be 2.21 ± 0.10 ± 0.20 Gyr. Additionally, using all measured eclipsing binary star masses and radii, we constrain the age to 2.38 ± 0.05 ± 0.22 Gyr. The quoted uncertainties are estimates of measurement and systematic uncertainties (due to model physics differences and metal content), respectively. This is paper 57 of the WIYN Open Cluster Study (WOCS).",
keywords = "binaries: eclipsing, binaries: spectroscopic, open clusters and associations: individual: NGC 6819, stars: evolution, techniques: photometric, techniques: spectroscopic",
author = "Brewer, {Lauren N.} and Sandquist, {Eric L.} and Mathieu, {Robert D.} and Katelyn Milliman and Geller, {Aaron M.} and Jeffries, {Mark W., Jr.} and Orosz, {Jerome A.} and Karsten Brogaard and Imants Platais and Hans Bruntt and Frank Grundahl and Dennis Stello and S{\o}ren Frandsen",
year = "2016",
month = mar,
day = "1",
doi = "10.3847/0004-6256/151/3/66",
language = "English",
volume = "151",
pages = "66",
journal = "The Astronomical Journal",
issn = "0004-6256",
publisher = "Institute of Physics Publishing, Inc",
number = "3",

}

RIS

TY - JOUR

T1 - Determining the Age of the Kepler Open Cluster NGC 6819 With a New Triple System and Other Eclipsing Binary Stars

AU - Brewer, Lauren N.

AU - Sandquist, Eric L.

AU - Mathieu, Robert D.

AU - Milliman, Katelyn

AU - Geller, Aaron M.

AU - Jeffries, Mark W., Jr.

AU - Orosz, Jerome A.

AU - Brogaard, Karsten

AU - Platais, Imants

AU - Bruntt, Hans

AU - Grundahl, Frank

AU - Stello, Dennis

AU - Frandsen, Søren

PY - 2016/3/1

Y1 - 2016/3/1

N2 - As part of our study of the old (˜2.5 Gyr) open cluster NGC 6819 in the Kepler field, we present photometric (Kepler and ground-based BVRCIC) and spectroscopic observations of the detached eclipsing binary WOCS 24009 (Auner 665; KIC 5023948) with a short orbital period of 3.6 days. WOCS 24009 is a triple-lined system, and we verify that the brightest star is physically orbiting the eclipsing binary using radial velocities and eclipse timing variations. The eclipsing binary components have masses MB = 1.090 ± 0.010 M⊙ and MC = 1.075 ± 0.013 M⊙, and radii RB = 1.099 ± 0.006 ± 0.005 R⊙ and RC = 1.069 ± 0.006 ± 0.013 R⊙. The bright non-eclipsing star resides at the cluster turnoff, and ultimately its mass will directly constrain the turnoff mass: our preliminary determination is MA = 1.251 ± 0.057 M⊙. A careful examination of the light curves indicates that the fainter star in the eclipsing binary undergoes a very brief period of total eclipse, which enables us to precisely decompose the light of the three stars and place them in the color-magnitude diagram (CMD). We also present improved analysis of two previously discussed detached eclipsing stars in NGC 6819 (WOCS 40007 and WOCS 23009) en route to a combined determination of the cluster’s distance modulus (m - M)V = 12.38 ± 0.04. Because this paper significantly increases the number of measured stars in the cluster, we can better constrain the age of the CMD to be 2.21 ± 0.10 ± 0.20 Gyr. Additionally, using all measured eclipsing binary star masses and radii, we constrain the age to 2.38 ± 0.05 ± 0.22 Gyr. The quoted uncertainties are estimates of measurement and systematic uncertainties (due to model physics differences and metal content), respectively. This is paper 57 of the WIYN Open Cluster Study (WOCS).

AB - As part of our study of the old (˜2.5 Gyr) open cluster NGC 6819 in the Kepler field, we present photometric (Kepler and ground-based BVRCIC) and spectroscopic observations of the detached eclipsing binary WOCS 24009 (Auner 665; KIC 5023948) with a short orbital period of 3.6 days. WOCS 24009 is a triple-lined system, and we verify that the brightest star is physically orbiting the eclipsing binary using radial velocities and eclipse timing variations. The eclipsing binary components have masses MB = 1.090 ± 0.010 M⊙ and MC = 1.075 ± 0.013 M⊙, and radii RB = 1.099 ± 0.006 ± 0.005 R⊙ and RC = 1.069 ± 0.006 ± 0.013 R⊙. The bright non-eclipsing star resides at the cluster turnoff, and ultimately its mass will directly constrain the turnoff mass: our preliminary determination is MA = 1.251 ± 0.057 M⊙. A careful examination of the light curves indicates that the fainter star in the eclipsing binary undergoes a very brief period of total eclipse, which enables us to precisely decompose the light of the three stars and place them in the color-magnitude diagram (CMD). We also present improved analysis of two previously discussed detached eclipsing stars in NGC 6819 (WOCS 40007 and WOCS 23009) en route to a combined determination of the cluster’s distance modulus (m - M)V = 12.38 ± 0.04. Because this paper significantly increases the number of measured stars in the cluster, we can better constrain the age of the CMD to be 2.21 ± 0.10 ± 0.20 Gyr. Additionally, using all measured eclipsing binary star masses and radii, we constrain the age to 2.38 ± 0.05 ± 0.22 Gyr. The quoted uncertainties are estimates of measurement and systematic uncertainties (due to model physics differences and metal content), respectively. This is paper 57 of the WIYN Open Cluster Study (WOCS).

KW - binaries: eclipsing

KW - binaries: spectroscopic

KW - open clusters and associations: individual: NGC 6819

KW - stars: evolution

KW - techniques: photometric

KW - techniques: spectroscopic

U2 - 10.3847/0004-6256/151/3/66

DO - 10.3847/0004-6256/151/3/66

M3 - Journal article

VL - 151

SP - 66

JO - The Astronomical Journal

JF - The Astronomical Journal

SN - 0004-6256

IS - 3

ER -