Results 51 to 60 of about 51,136 (327)

Parallaxes of Brown Dwarfs at USNO [PDF]

Symposium - International Astronomical Union, 2003
Trigonometric parallaxes have been measured by Dahn et al. (2002) for 28 cool dwarfs and brown dwarfs, including 17 L dwarfs and three T dwarfs. Broadband CCD and near-IR photometry (VRIz*JHK) have been obtained for these objects and for 24 additional late-type dwarfs. These data have been supplemented with astrometry and photometry from the literature,
Richard L. Walker, Arne Henden, Stephen E. Levine, Frederick J. Vrba, Hugh C. Harris, Harry H. Guetter, Ronald C. Stone, Blaise Canzian, Jeffery R. Pier, Conard C. Dahn, Christian B. Luginbuhl, David G. Monet, Alice K. B. Monet   +12 more
openaire   +3 more sources

Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs

The Astronomical Journal, 2023
Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass function.
Aaron M. Meisner, S. K. Leggett, Sarah E. Logsdon, Adam C. Schneider, Pascal Tremblin, Mark Phillips   +5 more
doaj   +1 more source

JA‐Mediated Regulation of Amino Acid Homeostasis Adjusts Metabolic Flux and Enhances Spider Mite Tolerance via the SlJAZ8‐SlWRKY57‐SlAVT6s Module in Tomato

Advanced Science, EarlyView.
This study elucidates a novel SlJAZ8‐SlWRKY57‐SlAVT6A/SlAVT6B module that effectively channels metabolic flux from primary to secondary metabolism, impacting plant growth, development, and resistance. Two novel vacuolar amino acid exporters, SlAVT6A and SlAVT6B, fine‐tunes trichomes, terpenes, and gibberellins, bolstering spider mite resistance.
Yingchen Hao, Xiaolong Wang, Langchen Guo, Lijun Xiang, Enxi Luo, Peng Cao, Penghui Liu, Yue Zhong, Chun Li, Jun Lai, Jun Yang, Shouchuang Wang   +11 more
wiley   +1 more source

Measuring tiny mass accretion rates onto young brown dwarfs [PDF]

, 2009
We present low-resolution Keck I/LRIS spectra spanning from 3200-9000 A of nine young brown dwarfs and three low-mass stars in the TW Hya Association and in Upper Sco.
Alencar, Alexander, Allers, Ardila, Baraffe, Burgasser, Calvet, Carpenter, Chabrier, Close, Dahm, de Geus, de Zeeuw, Gizis, Gorti, Gregory J. Herczeg, Gullbring, Hartmann, Herczeg, Herczeg, Jayawardhana, Jayawardhana, Johns-Krull, Kelle L. Cruz, Knapp, Looper, Luhman, Luhman, Luhman, Lynne A. Hillenbrand, Mamajek, Martin, Metchev, Mohanty, Mohanty, Morrow, Muzerolle, Muzerolle, Muzerolle, Muzerolle, Phillips, Preibisch, Riaz, Robberto, Romaniello, Rucinski, Scholz, Scholz, Slesnick, Stelzer, Webb, White, White   +52 more
core   +3 more sources

Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs [PDF]

The Astronomical Journal, 2002
48 pages, including 7 figures and 6 tables.
Richard L. Walker, Frederick J. Vrba, John E. Gizis, John E. Gizis, Arne Henden, James Liebert, Stephen E. Levine, I. Neill Reid, Alice K. B. Monet, Conard C. Dahn, Ronald C. Stone, Christian B. Luginbuhl, Jeffrey R. Pier, J. Davy Kirkpatrick, Harry H. Guetter, Hugh C. Harris, David G. Monet, B. Canzian, Adam J. Burgasser   +18 more
openaire   +3 more sources

Antagonistic Ghd7‐OsNAC42 Complexes Modulate Carbon and Nitrogen Metabolism to Achieves Superior Quality and High Yield in Rice

Advanced Science, EarlyView.
The complex centered on Ghd7 binds to numerous carbon and nitrogen metabolism genes on the genome through the corresponding motifs and transactivates the transcriptional expression of these carbon and nitrogen metabolism genes. With the assistance of OsNAC42 and other unknown Ghd7‐interacting proteins, this complex can regulate different metabolic ...
Guangming Lou, Pingli Chen, Pingbo Li, Haozhou Gao, Jiawang Xiong, Shanshan Wan, Yuanyuan Zheng, Yufu Wang, Mufid Alam, Yingnanjun Chen, Lei Wang, Jingjing Bai, Xuan Tan, Wenting Rao, Bian Wu, Hao Zhou, Yanhua Li, Guanjun Gao, Qinglu Zhang, Jinghua Xiao, Xianghua Li, Xuelei lai, Qifa Zhang, Yuqing He   +23 more
wiley   +1 more source

Where lies the peak of the brown dwarf binary separation distribution ?

, 2008
Searches for companions of brown dwarfs by direct imaging probe mainly orbital separations > 3-10 AU. On the other hand, previous radial velocity surveys of brown dwarfs are mainly sensitive to separations smaller than 0.6 AU.
Eric Stempels, Viki Joergens
core   +1 more source

Brown dwarf populations in open clusters [PDF]

, 2002
We present the results of multiple simulations of open clusters, modelling the dynamics of a population of brown dwarf members. We consider the effects of a large range of primordial binary populations, including the possibilities of having brown dwarf ...
Adams, Tim, Davies, Melvyn B., Jameson, Richard F., Scally, Aylwyn   +3 more
core   +3 more sources

A kinematically Bifurcated Metamaterial for Integrated Logic Operation and Computing

Advanced Science, EarlyView.
A family of 2n‐side kinematic polygonal modules with n decoupled inputs and 2n extreme configurations via kinematic bifurcation is proposed. It allows integrating seven basic logic gates on a quadrilateral module. Moreover, a minimized Parallel Computing Sum of Products function is developed, enabling all 2‐bit arithmetic (including division ...
Kaili Xi, Jingsong Wei, Xiao Zhang, Jiayao Ma, Zhong You, Changqing Chen, Yan Chen   +6 more
wiley   +1 more source

Characterizing Young Brown Dwarfs using Low Resolution Near-IR Spectra [PDF]

, 2006
We present near-infrared (1.0-2.4 micron) spectra confirming the youth and cool effective temperatures of 6 brown dwarfs and low mass stars with circumstellar disks toward the Chamaeleon II and Ophiuchus star forming regions.
Baraffe I., Cambresy L., Comeron F., D. E. Peterson, D. T. Jaffe, J. C. Wilson, J. D. Smith, K. L. Luhman, K. N. Allers, M. C. Cushing, M. F. Skrutskie, M. Nelson, Michael C. Liu, Perrin G., Whittet D. C. B.   +14 more
core   +2 more sources