Search Results - "Ayres, Thomas"

The Cycles of Alpha Centauri: Double Dipping of AB by Ayres, Thomas

“…In mid-2023, the Sunlike dwarfs of nearby α Centauri (HD 128620 (“A”): G2 V; HD 128621 (“B”): K1 V; hereafter “AB”) coincidentally both entered coronal ( T ≈…”
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In the Trenches of the Solar–Stellar Connection. VII. Wilson–Bappu 2022 by Ayres, Thomas

“…The Wilson–Bappu effect (WBE) is a remarkable correlation between the width of the chromospheric emission core of the Ca ii 3934 Å K line and stellar absolute…”
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In the Trenches of the Solar-stellar Connection. V. High-resolution Ultraviolet and X-Ray Observations of Sun-like Stars: The Curious Case of Procyon by Ayres, Thomas R.

“…A joint X-ray (0.2–2 keV) and ultraviolet (1150–3000 Å) time-domain study has been carried out on three nearby bright late-type stars, bracketing the Sun in…”
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In the Trenches of the Solar–Stellar Connection. III. The HST/COS Ecliptic-poles Stellar Survey (EclipSS) by Ayres, Thomas R.

“…The Ecliptic-poles Stellar Survey (EclipSS) collected far-ultraviolet (FUV: 1160–1420 Å) spectra of 49 nearby ( d ≲ 100 pc) F3–K3 main-sequence stars, located…”
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On the Same Wavelength as the Space Telescope Imaging Spectrograph by Ayres, Thomas R.

“…The Hubble Space Telescope Imaging Spectrograph (STIS) is a powerful tool for high spectral resolution ultraviolet (UV; 1150–3200 Å) studies of bright cosmic…”
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In the Trenches of the Solar–Stellar Connection. II. Extreme Ultraviolet Flux–Flux Correlations across Solar Cycle 24 by Ayres, Thomas R.

“…Solar extreme-ultraviolet (EUV: 100–1100 Å) radiation rises in the 10 4  K upper chromosphere and hotter layers extending into the million-degree corona. Much…”
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Cracking the Conundrum of F-supergiant Coronae by Ayres, Thomas R.

“…Chandra X-ray and HST far-ultraviolet (FUV) observations of three early-F supergiants have shed new light on a previous puzzle involving a prominent member of…”
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A Closer Look at the Alpha Persei Coronal Conundrum by Ayres, Thomas R.

“…A ROSAT survey of the Alpha Per open cluster in 1993 detected its brightest star, the mid-F supergiant Persei: the X-ray luminosity and spectral hardness were…”
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A light carbon isotope composition for the Sun by Lyons, James R., Gharib-Nezhad, Ehsan, Ayres, Thomas R.

“…Measurements by the Genesis mission have shown that solar wind oxygen is depleted in the rare isotopes, 17 O and 18 O, by approximately 80 and 100‰,…”
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In the Trenches of the Solar-stellar Connection. IV. Solar Full-disk Scans of C ii, Si iv, and Mg ii by the Interface Region Imaging Spectrograph by Ayres, Thomas, De Pontieu, Bart, Testa, Paola

“…About once a month, the Interface Region Imaging Spectrograph conducts day-long raster scans of the full Sun in three ultraviolet spectral channels. These…”
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The Origin of Weakened Magnetic Braking in Old Solar Analogs by Metcalfe, Travis S., Finley, Adam J., Kochukhov, Oleg, See, Victor, Ayres, Thomas R., Stassun, Keivan G., van Saders, Jennifer L., Clark, Catherine A., Godoy-Rivera, Diego, Ilyin, Ilya V., Pinsonneault, Marc H., Strassmeier, Klaus G., Petit, Pascal

“…The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of angular…”
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The Wind Temperature and Mass-loss Rate of Arcturus (K1.5 III) by Harper, Graham M., Ayres, Thomas R., O’Gorman, Eamon

“…In this paper we aim to constrain the wind temperature, outflow and turbulent velocities, ionization state, and mass-loss rate of the single red giant Arcturus…”
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HST STIS Observations of ζ Aurigae A's Irradiated Atmosphere by Harper, Graham M., Bennett, Philip D., Brown, Alexander, Ayres, Thomas R., Ohnaka, Keiichi, Griffin, Elizabeth

“…The details of the processes responsible for heating the chromospheres of evolved cool stars remain uncertain. While most spectroscopic diagnostics measure…”
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Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and τ Cet by Metcalfe, Travis S., Strassmeier, Klaus G., Ilyin, Ilya V., van Saders, Jennifer L., Ayres, Thomas R., Finley, Adam J., Kochukhov, Oleg, Petit, Pascal, See, Victor, Stassun, Keivan G., Jeffers, Sandra V., Marsden, Stephen C., Morin, Julien, Vidotto, Aline A.

“…During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking…”
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An experimental test of resource recovery from physical and relaxation work break activities by Hoover, Coty S., Ragsdale, Jennifer M., Ayres, Thomas B.

“…Actual resource replenishment, a defining part of the stress‐recovery process, has hardly been studied. We address this gap in the literature within the…”
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The Cycles of α Centauri by Ayres, Thomas R

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Weakened Magnetic Braking in the Exoplanet Host Star 51 Peg by Metcalfe, Travis S., Strassmeier, Klaus G., Ilyin, Ilya V., Buzasi, Derek, Kochukhov, Oleg, Ayres, Thomas R., Basu, Sarbani, Chontos, Ashley, Finley, Adam J., See, Victor, Stassun, Keivan G., van Saders, Jennifer L., Sepulveda, Aldo G., Ricker, George R.

“…The consistently low activity level of the old solar analog 51 Peg not only facilitated the discovery of the first hot Jupiter, but also led to the suggestion…”
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THE STRUCTURE OF THE LOCAL INTERSTELLAR MEDIUM. VI. NEW Mg II, Fe II, AND Mn II OBSERVATIONS TOWARD STARS WITHIN 100 pc by Malamut, Craig, Redfield, Seth, Linsky, Jeffrey L, Wood, Brian E, Ayres, Thomas R

“…We analyze high-resolution spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope toward 34 nearby stars ([< or =,…”
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Video Data for Escalator Accidents by Ayres, Thomas J.

“…Many videos of escalator accidents are available on social media, especially YouTube. A review of a large sample of such videos reveals information about some…”
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THE CURIOUS CASE OF THE ALPHA PERSEI CORONA: A DWARF IN SUPERGIANT'S CLOTHING? by AYRES, Thomas R

“…Alpha Persei (HD 20902: F5 Iab) is a luminous, nonvariable supergiant located at the blue edge of the Cepheid instability strip. It is one of the brightest…”
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