T. D. Oswalt

A Monte Carlo Method for Evaluating Empirical Gyrochronology Models

Tomomi Otani, Mariel Lares-Martiz, Ted von Hippel, T. D. Oswalt

Accurate stellar ages are essential for our understanding of the star formation history of the Milky Way and Galactic chemical evolution, as well as to constrain exoplanet formation models. Gyrochronology, a relationship between stellar rotation and age, appears to offer a reliable …

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A Monte Carlo Method for Evaluating Empirical Gyrochronology Models

Tomomi Otani, Mariel Lares-Martiz, Ted von Hippel, T. D. Oswalt

Accurate stellar ages are essential for our understanding of the star formation history of the Milky Way and Galactic chemical evolution, as well as to constrain exoplanet formation models. Gyrochronology, a relationship between stellar rotation and age, appears to offer a reliable …

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Evaluating the Limits of Rotation Period Recovery Through Gyrochronology Criteria

Mariel Lares-Martiz, T. D. Oswalt, Derek L. Buzasi, K. Boyer et autres

Abstract Contamination from nearby sources often compromises stellar rotation periods derived from photometric light curves, particularly in data with large pixel scales such as The Transiting Exoplanet Survey Satellite (TESS). This problem is compounded when both the target and contaminant are intrinsically …

Evaluating the Limits of Rotation Period Recovery through Gyrochronology Criteria

Mariel Lares-Martiz, T. D. Oswalt, Derek L. Buzasi, K. Boyer et autres

Contamination from nearby sources often compromises stellar rotation periods derived from photometric light curves, particularly in data with large pixel scales such as TESS. This problem is compounded when both the target and contaminant are intrinsically variable, a scenario that challenges deblending …

How Reliable are Rotation Period Determinations from TESS Data?

Mariel Lares-Martiz, Derek L. Buzasi, T. D. Oswalt, Krystian Confeiteiro et autres

Abstract Gyrochronology is the empirical relation between rotation and age. NASA's Transiting Exoplanet Survey Satellite (TESS), Kepler, and K2 missions have observed thousands of wide main sequence binaries. Since components of a binary are coeval, their rotation periods should be consistent with …

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Jay Henry Lieske (1941-2021)

T. D. Oswalt

John W. Fountain (1944–2016)

T. D. Oswalt

Thomas M. Jordan (1947–2021)

T. D. Oswalt

A fine-detailed analysis of the chemical abundances for the peculiar A-star beta Corona Borealis," was completed in 1977, under the advisement of Leon Schroeder.For several years afterward, Jordan worked for a railroad company in west central Indiana.Jordan subsequently accepted a faculty position …

José Antonio Flores-Velázquez (1994–2019)

T. D. Oswalt

Michael G. Gibbs (1972–2013)

T. D. Oswalt

James E. Felten (1934–2014)

T. D. Oswalt

Revisit of Open Clusters UPK 39, UPK 41, and PHOC 39: A New Binary Open Cluster Found

Xianhao Ye, Jingkun Zhao, T. D. Oswalt, Yong Yang et autres

Abstract We investigate the three open clusters near the Aquila Rift cloud, named UPK 39 (c1 hereafter), UPK 41 (c2 hereafter) in Sim et al. (2019), and PHOC 39 (c3 hereafter) in Hunt & Reffert (2021). Using photometric passpands, reddening, and extinction …

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