{"id":15,"date":"2016-12-08T01:13:06","date_gmt":"2016-12-08T01:13:06","guid":{"rendered":"http:\/\/esandquist.sdsu.edu\/?page_id=15"},"modified":"2023-03-18T19:12:37","modified_gmt":"2023-03-18T19:12:37","slug":"research","status":"publish","type":"page","link":"https:\/\/esandquist.sdsu.edu\/index.php\/research\/","title":{"rendered":"Research"},"content":{"rendered":"

The Ages of Stars<\/strong><\/h3>\n

I have been searching for and studying aging stars in binary star systems within star clusters. For stars in an eclipsing binary system, we are often able to measure their characteristics (like mass and size) with high precision. The size of a rapidly expanding star can subsequently give us its precise age. I have been working to find such stars in clusters \u00a0— groups of stars that were born at the same time — so that we can test our measured ages against other techniques in order to better understand the internal mechanisms that make a star work.<\/p>\n

For perspective, dating of meteorites using radioactivity puts the Sun and solar system<\/strong> at about 4.57 billion years<\/strong>.<\/p>\n

Some of our recent cluster targets:<\/p>\n

M11\/NGC 6705<\/strong> (220 million years old)<\/span><\/p>\n

\"credit:
credit: Jean-Charles Cuillandre\/CFHT
Astronomy Picture of the Day<\/a><\/figcaption><\/figure>\n

Reference:<\/strong> Bavarsad, E. A., Sandquist, E. L.<\/strong><\/span>, Shetrone, M. D., & Orosz, J. A. 2016, Astrophysical Journal, 831, 48. \u00a0Link<\/a><\/p>\n

Praesepe\/M44<\/strong> (640 milion years old)<\/span><\/p>\n

Reference<\/strong>: Morales, L. M., Sandquist, E. L.<\/strong><\/span>, Schaefer, G. H., et al. 2022, Astronomical Journal, 164, 32. Link<\/a><\/p>\n

NGC 6811<\/strong> (1.1 billion years old)<\/span> – a cluster observed by the Kepler<\/em> spacecraft<\/p>\n

Reference:<\/strong> Sandquist, E. L.<\/strong><\/span>, Jessen-Hansen, J., Shetrone, M. D., et al. 2016, Astrophysical Journal, 831, 11. Link<\/a><\/p>\n

NGC 752<\/strong> (1.6 billion years old)<\/span><\/p>\n

Reference<\/strong>: Sandquist, E. L.<\/strong><\/span>, Buckner, A. J., Shetrone, M. D., et al. 2023, Astronomical Journal, 165, 6. Link<\/a><\/p>\n

NGC 6819<\/strong> (2.4 billion years old)<\/span> – a cluster observed by the Kepler<\/em> spacecraft<\/p>\n

References:<\/strong> Brewer, L. N., Sandquist, E. L.<\/span><\/strong>, Mathieu, R. D., et al. \u00a02016, Astronomical Journal, 151, 66. \u00a0Link<\/a><\/p>\n

Jeffries, M. W., Jr., Sandquist, E. L.<\/span><\/strong>, Mathieu, R. D., et al. 2013, Astronomical Journal, 146, 58. Link<\/a><\/p>\n

Sandquist, E. L.<\/span><\/strong>, Mathieu, R. D., Brogaard, K., et al. 2013, Astrophysical Journal, 762, 58. Link<\/a><\/p>\n

NGC 7142<\/strong> (3.6 billion years old)<\/span> – pictured at top (credit: Tony Hallas)<\/p>\n

Reference: Sandquist, E. L.<\/span><\/strong>, Shetrone, M., Serio, A. W., & Orosz, J. 2013, Astronomical Journal, 146, 40. \u00a0Link<\/a><\/p>\n

M67\/NGC 2682<\/strong> (3.7 billion years old)<\/span><\/p>\n

Reference<\/strong>: Sandquist, E. L.<\/strong><\/span>, Latham, D. W., Mathieu, R. D., et al. 2021, Astronomical Journal, 161, 59. Link<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The Ages of Stars I have been searching for and studying aging stars in binary star systems within star clusters. For stars in an eclipsing binary system, we are often able to measure their characteristics (like mass and size) with high precision. The size of a rapidly expanding star can subsequently give us its precise … Continue reading Research<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":18,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-15","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/pages\/15","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/comments?post=15"}],"version-history":[{"count":15,"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/pages\/15\/revisions"}],"predecessor-version":[{"id":110,"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/pages\/15\/revisions\/110"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/media\/18"}],"wp:attachment":[{"href":"https:\/\/esandquist.sdsu.edu\/index.php\/wp-json\/wp\/v2\/media?parent=15"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}