scholarly journals Asteroseismology of 16,000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii

2018 ◽  
Vol 236 (2) ◽  
pp. 42 ◽  
Author(s):  
Jie Yu ◽  
Daniel Huber ◽  
Timothy R. Bedding ◽  
Dennis Stello ◽  
Marc Hon ◽  
...  
2010 ◽  
Vol 723 (2) ◽  
pp. 1607-1617 ◽  
Author(s):  
D. Huber ◽  
T. R. Bedding ◽  
D. Stello ◽  
B. Mosser ◽  
S. Mathur ◽  
...  

2010 ◽  
Vol 525 ◽  
pp. A131 ◽  
Author(s):  
S. Hekker ◽  
Y. Elsworth ◽  
J. De Ridder ◽  
B. Mosser ◽  
R. A. García ◽  
...  

2012 ◽  
Vol 544 ◽  
pp. A90 ◽  
Author(s):  
S. Hekker ◽  
Y. Elsworth ◽  
B. Mosser ◽  
T. Kallinger ◽  
W. J. Chaplin ◽  
...  

Author(s):  
Nicholas Mee

The Cosmic Mystery Tour is a brief account of modern physics and astronomy presented in a broad historical and cultural context. The book is attractively illustrated and aimed at the general reader. Part I explores the laws of physics including general relativity, the structure of matter, quantum mechanics and the Standard Model of particle physics. It discusses recent discoveries such as gravitational waves and the project to construct LISA, a space-based gravitational wave detector, as well as unresolved issues such as the nature of dark matter. Part II begins by considering cosmology, the study of the universe as a whole and how we arrived at the theory of the Big Bang and the expanding universe. It looks at the remarkable objects within the universe such as red giants, white dwarfs, neutron stars and black holes, and considers the expected discoveries from new telescopes such as the Extremely Large Telescope in Chile, and the Event Horizon Telescope, currently aiming to image the supermassive black hole at the galactic centre. Part III considers the possibility of finding extraterrestrial life, from the speculations of science fiction authors to the ongoing search for alien civilizations known as SETI. Recent developments are discussed: space probes to the satellites of Jupiter and Saturn; the discovery of planets in other star systems; the citizen science project SETI@Home; Breakthrough Starshot, the project to develop technologies to send spacecraft to the stars. It also discusses the Fermi paradox which argues that we might actually be alone in the cosmos


2000 ◽  
Vol 120 (2) ◽  
pp. 833-844 ◽  
Author(s):  
Solange V. Ramírez ◽  
Andrew W. Stephens ◽  
Jay A. Frogel ◽  
D. L. DePoy

Author(s):  
Jie Yu ◽  
Saskia Hekker ◽  
Timothy R Bedding ◽  
Dennis Stello ◽  
Daniel Huber ◽  
...  

Abstract Mass loss by red giants is an important process to understand the final stages of stellar evolution and the chemical enrichment of the interstellar medium. Mass-loss rates are thought to be controlled by pulsation-enhanced dust-driven outflows. Here we investigate the relationships between mass loss, pulsations, and radiation, using 3213 luminous Kepler red giants and 135000 ASAS–SN semiregulars and Miras. Mass-loss rates are traced by infrared colours using 2MASS and WISE and by observed-to-model WISE fluxes, and are also estimated using dust mass-loss rates from literature assuming a typical gas-to-dust mass ratio of 400. To specify the pulsations, we extract the period and height of the highest peak in the power spectrum of oscillation. Absolute magnitudes are obtained from the 2MASS Ks band and the Gaia DR2 parallaxes. Our results follow. (i) Substantial mass loss sets in at pulsation periods above ∼60 and ∼100 days, corresponding to Asymptotic-Giant-Branch stars at the base of the period-luminosity sequences C′ and C. (ii) The mass-loss rate starts to rapidly increase in semiregulars for which the luminosity is just above the red-giant-branch tip and gradually plateaus to a level similar to that of Miras. (iii) The mass-loss rates in Miras do not depend on luminosity, consistent with pulsation-enhanced dust-driven winds. (iv) The accumulated mass loss on the Red Giant Branch consistent with asteroseismic predictions reduces the masses of red-clump stars by 6.3%, less than the typical uncertainty on their asteroseismic masses. Thus mass loss is currently not a limitation of stellar age estimates for galactic archaeology studies.


2012 ◽  
Vol 540 ◽  
pp. A128 ◽  
Author(s):  
V. Dobrovolskas ◽  
A. Kučinskas ◽  
S. M. Andrievsky ◽  
S. A. Korotin ◽  
T. V. Mishenina ◽  
...  
Keyword(s):  

1989 ◽  
Vol 106 ◽  
pp. 367-367
Author(s):  
Ian Griffin ◽  
C.J. Skinner ◽  
B.R. Whitmore

We present near IR (H, K and L band) medium resolution (ƛ/Δƛ ∼ 600) spectra for a selection of 9 red giants which have previously been shown to exhibit anomalous dust emission as characterised by their IRAS LRS spectra. The objects observed (during UKIRT and AAT service time) include Carbon stars whose LRS spectra show the 9.7μm silicate feature and also M stars whose LRS spectra display an 11.3μm feature similar to that usually associated with emission from SiC dust grains.


2020 ◽  
Vol 30 ◽  
pp. 100727
Author(s):  
Sunny Clea ◽  
Arun Kenath ◽  
C. Sivaram ◽  
S.B. Gudennavar
Keyword(s):  

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