Results 51 to 60 of about 45,248 (299)

The role of binarity in Wolf-Rayet central stars of planetary nebulae

, 2015
Over a hundred planetary nebulae (PNe) are known to have H-deficient central stars that mimic the spectroscopic appearance of massive Wolf-Rayet stars. The formation of these low-mass Wolf-Rayet stars, denoted [WR] stars, remains poorly understood. While
Manick, Rajeev, McBride, Vanessa, Miszalski, Brent   +2 more
core   +1 more source

FM stars: A Fourier view of pulsating binary stars, a new technique for measuring radial velocities photometrically [PDF]

, 2012
Some pulsating stars are good clocks. When they are found in binary stars, the frequencies of their luminosity variations are modulated by the Doppler effect caused by orbital motion.
Kurtz, Donald W., Shibahashi, Hiromoto
core   +2 more sources

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b

The Astrophysical Journal Letters
HD 143811 AB is the host star to the directly imaged planet HD 143811 AB b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2.
Anne E. Peck, William Roberson, Eric L. Nielsen, Robert J. De Rosa, Nathalie Jones, Jason Wang, Bruce A. Macintosh, Briley L. Lewis, Gaspard Duchêne, Stanimir Metchev, Asif Abbas, Jerry W. Xuan, Aniket Sanghi, Jennifer Patience, Travis S. Barman, Joanna Bulger, Jeffrey K. Chilcote, Thomas M. Esposito, Michael P. Fitzgerald, Katherine B. Follette, Hannah Gallamore, Stephen Goodsell, James R. Graham, Alexandra Z. Greenbaum, Pascale Hibon, Patrick Ingraham, Paul Kalas, Quinn M. Konopacky, Franck Marchis, Jérôme Maire, Christian Marois, Brenda Matthews, Dimitri Mawet, Maxwell A. Millar-Blanchaer, Rebecca Oppenheimer, David W. Palmer, Marshall D. Perrin, Lisa Poyneer, Laurent Pueyo, Abhijith Rajan, Julien Rameau, Fredrik T. Rantakyrö, Bin Ren, Jean-Baptiste Ruffio, Dmitry Savransky, Adam C. Schneider, Anand Sivaramakrishnan, Adam J. R. W. Smith, Inseok Song, Remi Soummer, Sandrine Thomas, Kimberly Ward-Duong, Schuyler G. Wolff   +52 more
doaj   +1 more source

2(+1?) Binary Central Stars: A Spectroscopic Study [PDF]

Symposium - International Astronomical Union, 2003
We report on a study of 3 post common-envelope binary systems; EC 11575-1845, V644 Cas (the central star of the PN HFG 1), and VW Pyx (the central star of K 1–2). These 3 have similar photometric and spectroscopic characteristics. Emission lines from the heated face of the cool star move with different velocities, and the H I lines are very broad with ...
Katrina Exter, Don Pollacco
openaire   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

The Long-period Spectroscopic Orbit and Dust Creation in the Wolf–Rayet Binary System WR 125

The Astrophysical Journal
Several long-period binaries with a carbon-rich Wolf–Rayet star and an OB star produce dust in their wind collisions. In eccentric binaries, this is seen most strongly near periastron passage.
Noel D. Richardson, Andrea R. Daly, Peredur M. Williams, Grant M. Hill, Victor I. Shenavrin, Izumi Endo, André-Nicolas Chené, Nicole Karnath, Ryan M. Lau, Anthony F. J. Moffat, Gerd Weigelt   +10 more
doaj   +1 more source

Searching for Double-line Spectroscopic Binaries in the LAMOST Medium-resolution Spectroscopic Survey with Deep Learning

The Astrophysical Journal Supplement Series, 2023
Double-line spectroscopic binaries (SB2s) are a vital class of spectroscopic binaries for studying star formation and evolution. Searching for SB2s has been a hot topic in astronomy.
Zepeng Zheng, Zhong Cao, Hui Deng, Ying Mei, Lei Tan, Feng Wang   +5 more
doaj   +1 more source

Spectroscopic Binaries among Low-Mass Pre-Main Sequence Stars [PDF]

Highlights of Astronomy, 1989
Although the unusual nature of T Tau was noted over four decades ago, the first orbit for a low-mass pre-main sequence (PMS) spectroscopic binary was not determined until Mundt et al. (1983) serendipitously discovered the double-lined nature of V826 Tau. To some degree the paucity of spectroscopic binary detections may be attributed to the faintness of
openaire   +1 more source

The nearby astrometric-spectroscopic binary star Hip 68682

Frontiers in Astronomy and Space Sciences, 2023
The nearby astrometric-spectroscopic binary star Hip 68682 has an orbital period of ∼ 9.88 yr. The dynamical state (component masses and kinematic parameters) of this system is redetermined by fitting all the observational data available to us, including the radial velocity data (RVD), the relative position data (RPD), and the Hipparcos Intermediate ...
Fang Xia, Xiaoli Wang, Yanning Fu, Yue Chen, Yue Chen   +4 more
openaire   +2 more sources