Results 31 to 40 of about 40,670 (264)

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

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

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

VLT/SPHERE survey for exoplanets around young early-type stars, including systems with multi-belt architectures [PDF]

, 2020
Context. Dusty debris disks around pre- and main-sequence stars are potential signposts for the existence of planetesimals and exoplanets. Giant planet formation is therefore expected to play a key role in the evolution of the disk.
Marleau, G-D., Rojo Rubke, Patricio, Bonnefoy, Mickael, Bonnefoy, M., Beust, Herve, Mordasini, Christoph, Lagrange, A.-M., Allard, F., G-D. Marleau, Boccaletti, A., Galicher, R., Bayo, Alberto, Lagadec, E., C. Lazzoni, Boccaletti, Anthony, Delorme, P., Jenkins, James Stewart, Laibe, G., Desidera, Silvano, E. Lagadec, F. Allard, M. Bonnefoy, Girard, J., Lombart, M., Delorme, Philippe, Girard, Julien, Mordasini, C., Rojo, P., A. -M. Lagrange, J. Girard, M. Lombart, H. Beust, Lombart, Maxime, Bonavita, M., G. Chauvin, A. Bayo, P. Rojo, R. Galicher, Bayo, A., Marleau, Gabriel Dominique, Beust, H., Lagrange, Anne Marie, Chauvin, G., D. Minniti, Minniti, D., Jenkins, J.S., Jenkins, J. S., M. Bonavita, Gratton, R., S. Desidera, Mesa, Dino, G. Laibe, Mesa, D., C. Mordasini, Marleau, G.-D., Allard, France, A.-M. Lagrange, J. S. Jenkins, P. Delorme, A. Boccaletti, Desidera, S., Lagadec, Eric, Minniti, Dante, H. Klahr, D. Mesa, Gratton, Raffaele, Chauvin, Gael Epely, R. Gratton, Galicher, Raphael, Bonavita, Mariangela, Klahr, H., Lazzoni, C.   +71 more
core   +1 more source

Early-Type Magnetic Stars

The Astrophysical Journal, 1968
Surface magnetic field variations in early stars, suggesting mechanism for magnetic energy transfer from convective core to ...
A. Finzi, R. A. Wolf
openaire   +1 more source

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

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

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

Early assembly of the most massive galaxies [PDF]

, 2009
The current consensus is that galaxies begin as small density fluctuations in the early Universe and grow by in situ star formation and hierarchical merging(1).
Chris A. Collins, Scott T Kay (16045382), Nicola Mehrtens (16047884), Ed Lloyd-Davies, Hoyle, Ben, Hosmer, Mark, Christopher J. Miller, Ben Hoyle, Mehrtens, Nicola, Robert G. Mann, Pedro T. P. Viana, Martin Sahlén (267044), S Adam Stanford (16061237), Mark Hosmer (16070585), Robert C Nichol (16067396), John P Stott (16070582), Martin Sahlén, Sahlen, Martin, John P. Stott, Kathy Romer (4460893), Matt Hilton (6956609), Viana, Pedro T. P., Mann, Robert G., Ben Hoyle (6914513), Stott, John P., Matt Hilton, Robert G Mann (7965452), Andrew Liddle, Stanford, S. Adam, Christopher J Miller (16070591), A. Kathy Romer, Davidson, Michael, Ed Lloyd-Davies (16075100), Romer, A. Kathy, Robert C. Nichol, Andrew Liddle (16042793), Pedro T P Viana (16045379), Nichol, Robert C., Kay, Scott T., Michael J. West, Chris A Collins (16061234), Scott T. Kay, Collins, Chris A., Michael Davidson, Mark Hosmer, West, Michael J., Michael Davidson (699678), S. Adam Stanford, Michael J West (5524436), Liddle, Andrew, Nicola Mehrtens, Miller, Christopher J., Hilton, Matt, Lloyd-Davies, Ed   +53 more
core   +1 more source

A Study of Stochastic Low-frequency Variability for Galactic O-type Stars

The Astrophysical Journal Supplement Series
In order to explore how the ubiquitous stochastic low-frequency (SLF) variability of O-type stars is related to various stellar characteristics, we compiled a sample of 150 O-type stars observed via ground-based spectroscopic surveys, alongside ...
Dong-Xiang Shen, Chun-Hua Zhu, Guo-Liang Lü, Xi-zhen Lu, Xiao-long He   +4 more
doaj   +1 more source