scholarly journals Do Hertzsprung‐gap stars show any chemical anomaly?

2019 ◽  
Vol 340 (5) ◽  
pp. 364-385
Author(s):  
Yoichi Takeda ◽  
Gwanghui Jeong ◽  
Inwoo Han
Keyword(s):  
Hertzsprung Gap ◽  
Chemical Anomaly

scholarly journals AE Ursae Majoris – a δ Scuti Star in the Hertzsprung Gap

2017 ◽  
pp. stx125 ◽  
Author(s):  
Jia-Shu Niu ◽  
Jian-Ning Fu ◽  
Yan Li ◽  
Xiao-Hu Yang ◽  
Weikai Zong ◽  
...  
Keyword(s):  
Scuti Star ◽  
Hertzsprung Gap

scholarly journals Fossil Magnetospheres Confront Newborn Dynamos in the Rapid Braking Zone

2004 ◽  
Vol 215 ◽  
pp. 280-286
Author(s):  
Thomas R. Ayres
Keyword(s):  
Surface Field ◽  
New Type ◽  
Hertzsprung Gap

Fast spinning Hertzsprung gap giants display super-rotational broadening of UV “hot” lines like Fe XXI λ1354 and C IV λ1548, with FWHM's up to twice that expected from the photospheric v sin i. This possibly is the result of extended fossil magnetospheres enveloping the gap giants, a new type of stellar corona. The magnetospheric phase is short-lived, however, as the rapidly evolving giants develop a competing dynamo-generated surface field in the so-called Rapid Braking Zone.

Some aspects of the spectroscopic behavior of the stars of highest luminosity in the region of the Hertzsprung gap

1981 ◽  
Vol 243 ◽  
pp. 894 ◽  
Author(s):  
W. W. Morgan ◽  
P. C. Keenan ◽  
H. A. Abt ◽  
J. W. Tapscott
Keyword(s):  
Hertzsprung Gap ◽  
Spectroscopic Behavior

The Capella Giants and Coronal Evolution across the Hertzsprung Gap

2002 ◽  
Vol 565 (2) ◽  
pp. L97-L100 ◽  
Author(s):  
O. Johnson ◽  
J. J. Drake ◽  
V. Kashyap ◽  
N. S. Brickhouse ◽  
A. K. Dupree ◽  
...  
Keyword(s):  
Hertzsprung Gap

The Deposit Features and Comprehensive Information Prospecting Model of Mengyejing Potash Deposits in Yunnan Province

2012 ◽  
Vol 588-589 ◽  
pp. 2136-2139
Author(s):  
Wei Hao Yue ◽  
Jian Guo Gao
Keyword(s):  
Remote Sensing ◽  
Gravity Anomaly ◽  
Large Scale ◽  
Yunnan Province ◽  
Foreland Basin ◽  
The Core ◽  
Geochemical Anomalies ◽  
Comprehensive Information ◽  
Integrated Study ◽  
Chemical Anomaly

Mengyejing potash deposit lies in brown-red and variedness salting-in nagelfluh formation of Cenozoic Mengyejing formation which is located at the back-foreland basin of Lanping-Simao bidirectional arc zone, and it is one of the few large-scale solid potash deposits in China. By integrated study systematically, Mengyejing Potash Deposit’s different scales of mineralization geological anomalies information:geological, geophysical, geochemical, and salt spring chemistry and remote sensing were extracted. A comprehensive information prospecting model of Mengyejing potash deposit is established. Tentatively identified deposits prospecting model of Mengyejing formation, negative gravity anomaly, salt spring chemical anomaly and geochemical anomalies as the core and is of a positive significance for this type of deposit’s prospecting.

scholarly journals The Hertzsprung-gap giant 31 Comae in 2013: Magnetic field and activity indicators

2013 ◽  
Vol 9 (S302) ◽  
pp. 365-366
Author(s):  
Ana P. Borisova ◽  
Renada Konstantinova-Antova ◽  
Michel Aurière ◽  
Pascal Petit ◽  
Corinne Charbonnel
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Imaging Study ◽  
Doppler Imaging ◽  
Evolutionary Status ◽  
Rotational Period ◽  
Giant Star ◽  
Spectral Activity ◽  
Hertzsprung Gap

AbstractWe have observed the giant star 31 Comae in April and May 2013 with the spectropolarimeter Narval at Pic du Midi Observatory, France. 31 Comae is a single, rapidly rotating giant with rotational period ~6.8 d and vsini ~ 67 km/s. We present measurements and discuss variability of the longitudinal magnetic field (Bl), spectral activity indicators Hα, CaII H&K, Ca II IR triplet and evolutionary status. Our future aim is to perform a Zeeman-Doppler imaging study for the star.

Magnetic Field And Chemical Anomalies of Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 43-48
Author(s):  
A.Z. Dolginov
Keyword(s):  
Magnetic Field ◽  
Liquid Core ◽  
Close Binaries ◽  
Poloidal Magnetic Field ◽  
Stellar Matter ◽  
The Earth ◽  
Chemical Anomalies ◽  
Ap Stars ◽  
The Magnetic Field ◽  
Chemical Anomaly

SummaryIt is shown that owing to the “battery” effect the spatial nonuniform helium distribution in Ap stars causes a toroidal magnetic field of about 103- 104gauss. Possible circulation of stellar matter in this field produce a poloidal magnetic field of the same order as the toroidal one even if the velocities of circulation are about 10-4-10-5cm/s. The chemical anomaly in turn is supported and amplified by the magnetic field. It is pointed out that the “battery” effect is likely to take place in the liquid core of the earth and in components of close binaries if they are nonuniformly heated by their companions.

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