Eric L. Sandquist
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View article: Precise Age for the Binary HD 21278 in the Young <i>α</i> Persei Cluster
Precise Age for the Binary HD 21278 in the Young <i>α</i> Persei Cluster Open
We present a study of the double-lined spectroscopic binary HD 21278 that contains one of the brightest main-sequence stars in the young α Persei open cluster. We analyzed new spectra and reanalyzed archived spectra to measure precise new …
View article: Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster
Precise Age For The Binary HD 21278 In The Young Alpha Persei Cluster Open
We present a study of the double-lined spectroscopic binary HD 21278 that contains one of the brightest main sequence stars in the young $α$ Persei open cluster. We analyzed new spectra and reanalyzed archived spectra to measure precise ne…
View article: Asteroseismic study of subgiants and giants of the open cluster M67 using Kepler/K2: expanded sample and precise masses
Asteroseismic study of subgiants and giants of the open cluster M67 using Kepler/K2: expanded sample and precise masses Open
Sparked by the asteroseismic space revolution, ensemble studies have been used to produce empirical relations linking observed seismic properties and fundamental stellar properties. Cluster stars are particularly valuable because they have…
View article: Isochrone fitting of the open cluster M67 in the era of <i>Gaia</i> and improved model physics
Isochrone fitting of the open cluster M67 in the era of <i>Gaia</i> and improved model physics Open
The Gaia mission has provided highly accurate observations that have significantly reduced the scatter in the colour–magnitude diagrams of open clusters. As a result of the improved isochrone sequence of the open cluster M67, we have creat…
View article: Asteroseismic age estimate of the open cluster NGC 6866 using <i>Kepler</i> and <i>Gaia</i>
Asteroseismic age estimate of the open cluster NGC 6866 using <i>Kepler</i> and <i>Gaia</i> Open
Context. Asteroseismic investigations of solar-like oscillations in giant stars allow for the derivation of their masses and radii. For members of open clusters, this allows us to obtain an age estimate of the cluster that is expected to b…
View article: An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia Open
Asteroseismology of solar-like oscillations in giant stars allow the derivation of their masses and radii. For members of open clusters this allows an age estimate of the cluster which should be identical to the age estimate from the colou…
View article: Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster
Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster Open
We present measurements of the interferometrically resolved binary star system 12 Com and the single giant star 31 Com in the cluster Coma Berenices. 12 Com is a double-lined spectroscopic binary system consisting of a G7 giant and an A3 d…
View article: Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster
Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster Open
We present measurements of the interferometrically-resolved binary star system 12 Com and the single giant star 31 Com in the cluster Coma Berenices. 12 Com is a double-lined spectroscopic binary system consisting of a G7 giant and an A3 d…
View article: Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752*
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752* Open
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M 1 =…
View article: Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752 Open
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 day binary DS And and the 15.53 d BD $+$37 410. For DS And, we find $M_1 = …
View article: The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age
The Interferometric Binary ϵ Cnc in Praesepe: Precise Masses and Age Open
We observe the brightest member of the Praesepe cluster, ϵ Cnc, to precisely measure the characteristics of the stars in this binary system, en route to a new measurement of the cluster’s age. We present spectroscopic radial velocity measu…
View article: The Interferometric Binary Epsilon Cancri in Praesepe: Precise Masses and Age
The Interferometric Binary Epsilon Cancri in Praesepe: Precise Masses and Age Open
We observe the brightest member of the Praesepe cluster, Epsilon Cancri, to precisely measure the characteristics of the stars in this binary system, en route to a new measurement of the cluster's age. We present spectroscopic radial veloc…
View article: Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members
Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members Open
Context. Models of stellar structure and evolution can be constrained using accurate measurements of the parameters of eclipsing binary members of open clusters. Multiple binary stars provide the means to tighten the constraints and, in tu…
View article: Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries
Extremely precise age and metallicity of the open cluster NGC 2506 using detached eclipsing binaries Open
Accurate stellar parameters of stars in open clusters can help constrain models of stellar structure and evolution. Here, we wish to determine the age and metallicity content of the open cluster NGC 2506. To this end, we investigated three…
View article: Astro2020 APC White Paper: Enabling Terminal Master's Degrees as a Step Towards a Ph.D
Astro2020 APC White Paper: Enabling Terminal Master's Degrees as a Step Towards a Ph.D Open
Earning any advanced degree in physics or astronomy is an arduous process and major accomplishment. However, not every journey to the Ph.D. is paved equally. Every year, there are hundreds of students who earn terminal master's degrees in …
View article: The blue straggler V106 in NGC 6791: a prototype progenitor of old single giants masquerading as young
The blue straggler V106 in NGC 6791: a prototype progenitor of old single giants masquerading as young Open
We determine the properties of the binary star V106 in the old open cluster NGC6791. We identify the system to be a blue straggler cluster member by using a combination of groundbased and Kepler photometry and multi-epoch spectroscopy. The…
View article: Discovery of a White Dwarf Main-sequence Binary in Open Cluster NGC 752
Discovery of a White Dwarf Main-sequence Binary in Open Cluster NGC 752 Open
We identify a likely member of the NGC 752 open cluster (based on Gaia DR2 proper motions and parallax) having photometry consistent with being a white dwarf and a relatively low-mass main sequence star. If confirmed, this would be the fir…
View article: THE DETACHED ECLIPSING BINARY KV 29 AND THE AGE OF THE OPEN CLUSTER M11
THE DETACHED ECLIPSING BINARY KV 29 AND THE AGE OF THE OPEN CLUSTER M11 Open
We present an extensive set of photometry and radial velocities for the detached eclipsing binary KV 29 in the intermediate-aged open cluster M11 (NGC 6705). Spectroscopy shows that the system is double lined, and all available evidence (p…
View article: Testing asteroseismic scaling relations using eclipsing binaries in star clusters and the field
Testing asteroseismic scaling relations using eclipsing binaries in star clusters and the field Open
The accuracy of stellar masses and radii determined from asteroseismology is not known! We examine this issue for giant stars by comparing classical measurements of detached eclipsing binary systems (dEBs) with asteroseismic measurements f…
View article: Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission
Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission Open
Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates of these properties are however scarce, especially in the metal-poor regime. He…
View article: Withdrawn as Duplicate: Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission
Withdrawn as Duplicate: Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission Open
Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates of these properties are however scarce, especially in the metal-poor regime. He…