Results 31 to 40 of about 11,496,581 (289)

Ultraviolet Spectrophotometry of Early-Type Stars [PDF]

Symposium - International Astronomical Union, 1976
The ultraviolet spectra of B stars obtained with the sky scan telescope in the TD1 satellite have been used to obtain narrow-band magnitudes at several wavelengths. These photometric bands have an effective half-width of 100 Å. We have proposed a two-dimensional classification scheme based on ultraviolet colours, and some preliminary results are ...
K. Nandy, G. I. Thompson, C. M. Humphries   +2 more
openaire   +1 more source

The magnetic fields, activity and hidden companions of solar-type stars [PDF]

, 2023
The magnetic fields of the Sun and other solar-type stars manifest in a range of observable surface phenomena that provide insight into the magnetic dynamos operating within, but also hamper the detection of exoplanets.
Brown, Emma
core   +1 more source

Magnetic Doppler imaging of early-type stars

, 2010
Doppler imaging of early-type magnetic stars is the most advanced method to interpret their line profile variations. DI allows us to study directly a complex interplay between chemical spots, magnetic fields, and the mass loss.
Iosif Romanyuk, Kochukhov, Oleg,, Mary E. Oksala, Romanyuk, Iosif, Thomas Rivinius, Rivinius, Thomas, Oksala, Mary E., Oleg Kochukhov   +7 more
core   +1 more source

The properties of early-type stars in the Magellanic Clouds [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractThe past decade has witnessed impressive progress in our understanding of the physical properties of massive stars in the Magellanic Clouds, and how they compare to their cousins in the Galaxy. I summarise new results in this field, including evidence for reduced mass-loss rates and faster stellar rotational velocities in the Clouds, and their ...
openaire   +2 more sources

What can magnetic early B-type stars tell us about early B-type stars in general?

, 2016
Some magnetic early B-type stars display Hα emission originating in their Centrifugal Magnetospheres (CMs). To determine the rotational and magnetic properties necessary for the onset of emission, we analyzed a large spectropolarimetric dataset for a ...
Grunhut, Jason, Wade, Gregg,, Alecian, Evelyne,, Jason Grunhut, Evelyne Alecian, Neiner, Coralie,, Petit, Veronique,, Gregg Wade, Rivinius, Thomas,, Wade, Gregg, null null, Neiner, Coralie, Grunhut, Jason,, Coralie Neiner, Alecian, Evelyne, Matthew Shultz, Thomas Rivinius, Rivinius, Thomas, Véronique Petit, Shultz, Matthew,, Binamics Collaboration, ., Shultz, Matthew E., Petit, Veronique   +22 more
core   +1 more source

Tidal friction in early-type stars [PDF]

The Astrophysical Journal, 1989
The tidal torque on an early-type star is concentrated near the boundary between the convective core and radiative envelope and a train of gravity waves is excited there. The angular momentum which the torque removes from the fluid is transported outward by the gravity waves, which carry negative angular momentum.
Goldreich, Peter, Nicholson, Philip D.
openaire   +2 more sources

Bayesian Ages for Early-type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades

, 2015
We combine recently computed models of stellar evolution using a new treatment of rotation with a Bayesian statistical framework to constrain the ages and other properties of early-type stars. We find good agreement for early-type stars and clusters with
Huang, Chelsea X., Brandt, Timothy D.
core   +1 more source

European Standard Clinical Practice Guideline and EXPeRT Recommendations for the Diagnosis and Management of Gastroenteropancreatic Neuroendocrine Neoplasms in Children and Adolescents

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Pediatric gastroenteropancreatic neuroendocrine neoplasms (GEP‐NENs) are extremely rare and clinically heterogeneous. Management has largely been extrapolated from adult practice. This European Standard Clinical Practice Guideline (ESCP), developed by the EXPeRT network in collaboration with adult NEN experts, provides (adult) evidence ...
Michaela Kuhlen, Calogero Virgone, Antje Redlich, Michael Abele, Ricardo Lopez‐Almaraz, Tal Ben‐Ami, Ewa Bien, Gianni Bisogno, Maja Mazic Cesen, Andrea Ferrari, Malgorzata A. Krawczyk, Yves Reguerre, Dominik T. Schneider, Ines B. Brecht, Charlotte Rigaud, Bilgehan Yalcin, Rainer Claus, Christian Vokuhl, Constantin Lapa, Jörg Fuchs, Segolene Hescot, Thomas Walter, Julien Hadoux, Daniel Orbach   +23 more
wiley   +1 more source

Mass Loss from Early-Type Stars [PDF]

Symposium - International Astronomical Union, 1970
Following the detailed study of four very high luminosity OB stars, a survey has been made for spectroscopic evidence of mass loss in a number of early-type supergiants. A list of spectroscopic criteria is given and the mass loss estimates for 24 stars plotted on the HR diagram.
openaire   +1 more source

Chemical Abundances of Early Type Stars [PDF]

Symposium - International Astronomical Union, 1998
X-rays from early-type stars are emitted by the corona or the stellar wind. The materials in the surface layer of early-type stars are not contaminated by nuclear reactions in the stellar inside. Therefore, abundance study of the early-type stars provides us an information of the abundances of the original gas.
S. Tanaka, S. Kitamoto, T. Suzuki, K. Torii, M. F. Corcoran, W. Waldron   +5 more
openaire   +1 more source