Results 161 to 170 of about 14,196,004 (190)
Some of the next articles are maybe not open access.
Circumstellar Envelopes and Disks of Pre-Main Sequence Stars
Astrophysics and Space Science, 1995The current state of knowledge about circumstellar matter of young stellar objects is briefly reviewed. It appears that some very young stars yet to accrete substantial amounts of mass may be seen through their dusty infalling envelopes even at optical wavelengths, because of the presence of holes or large departures from spherical symmetry in the ...
openaire +1 more source
Pre-main-sequence variable stars
2007In section 2.19, we outlined what was presently known about star formation, and the early evolution of stars. There are several types of variability which are specifically or predominantly found among young stars. Most or all of these would be found in a given star, such as the sun, at various times in its pre-main-sequence (PMS) lifetime.
openaire +1 more source
Asteroseismology of pre-main sequence stars
2008More than 30 years ago the first pulsating pre-main sequence (PMS) stars have been discov- ered. Since then, pulsations in 18 Herbig Ae stars and 18 members of young open clusters were detected and detailed asteroseismic investigations were conducted for some of them. We describe our latest results in this field.
Zwintz, Konstanze +2 more
openaire +2 more sources
The Chromospheres of Pre-Main Sequence Flare Stars
Publications of the Astronomical Society of Australia, 1989AbstractOptical spectra of pre-main sequence flare stars in Orion are presented and analysed by the use of stellar chromospheric models. The stars observed divide into three groups on the basis of their quiescent spectra. The majority of the sample are similar to the dMe stars, with prominent Ca II and Balmer line emission.
openaire +1 more source
Structure and Evolution of Pre-Main Sequence Stars
2009Low-mass pre-main sequence (PMS) stars are strong and variable X-ray emitters, as has been well established by EINSTEIN and ROSAT observatories. It was originally believed that this emission was of thermal nature and primarily originated from coronal activity (magnetically confined loops, in analogy with Solar activity) on contracting young stars ...
Schulz, Norbert S. +11 more
openaire +1 more source
Accretion onto Pre-Main-Sequence Stars
Annual Review of Astronomy and Astrophysics, 2016Nuria Calvet +2 more
exaly
Discovery of the pre-main sequence progenitors of the magnetic Ap/Bp stars?
Astronomy and Astrophysics, 2005Jean-Francois Donati +2 more
exaly