Results 51 to 60 of about 201,996 (278)

Detection of the Temperature Dependence of the White Dwarf Mass–Radius Relation with Gravitational Redshifts

The Astrophysical Journal
Models predict that the well-studied mass–radius relation of white dwarf stars depends on the temperature of the star, with hotter white dwarfs having larger masses at a given radius than cooler stars.
Nicole R. Crumpler, Vedant Chandra, Nadia L. Zakamska, Gautham Adamane Pallathadka, Stefan Arseneau, Nicola Gentile Fusillo, J. J. Hermes, Carles Badenes, Priyanka Chakraborty, Boris T. Gänsicke, Stephen P. Schmidt   +10 more
doaj   +1 more source

Red Giants Search Method Based on Convolutional Neural Networks

The Astronomical Journal, 2023
Red giants play a crucial role in astronomical exploration. However, the current search for these stars heavily relies on spectrum analysis, making it a cumbersome process.
Hao Yuan, Meng Liu, Zechao Yang, Yude Bu, Zhenping Yi, Xiaoming Kong, Tianmin Wu, Ran Zhang   +7 more
doaj   +1 more source

Asteroseismology of the open clusters NGC 6791, NGC 6811, and NGC 6819 from nineteen months of Kepler photometry [PDF]

, 2012
We studied solar-like oscillations in 115 red giants in the three open clusters NGC 6791, NGC 6811, and NGC 6819, based on photometric data covering more than 19 months with NASA's Kepler space telescope.
Alfio Bonanno, Basu, Bedding, Bedding, Benoit Mosser, Bildsten, Bragaglia, Brown, Christensen-Dalsgaard, Christensen-Dalsgaard, Christensen-Dalsgaard, Daniel Huber, Dennis Stello, Enrico Corsaro, Glushkova, Gough, Hans Kjeldsen, Hole, Houdek, Huber, Jenkins, Jenkins, Jennifer R. Hall, Jørgen Christensen-Dalsgaard, Karsten Brogaard, Khadeejah A. Ibrahim, Koch, Meibom, Montalbán, Othman Benomar, Rafael A. García, Ramírez, Rosvick, Sarbani Basu, Saskia Hekker, Savita Mathur, Skrutskie, Stello, Stello, Stello, Søren Meibom, Thomas Kallinger, Timothy R. Bedding, Timothy R. White, Todd C. Klaus, Vandakurov, White, White, William J. Chaplin, Yvonne P. Elsworth   +49 more
core   +4 more sources

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

The Caenorhabditis elegans DPF‐3 and human DPP4 have tripeptidyl peptidase activity

FEBS Letters, EarlyView.
The dipeptidyl peptidase IV (DPPIV) family comprises serine proteases classically defined by their ability to remove dipeptides from the N‐termini of substrates, a feature that gave the family its name. Here, we report the discovery of a previously unrecognized tripeptidyl peptidase activity in DPPIV family members from two different species.
Aditya Trivedi, Rajani Kanth Gudipati
wiley   +1 more source

LAMA: LAMOST Medium-Resolution Spectral Analysis Pipeline

The Astrophysical Journal Supplement Series
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) has obtained more than 23 million spectra, opening an unprecedented opportunity to study stellar physics, as well as the formation and evolution of our Milky Way.
Chun-qian Li, Jian-rong Shi, Hong-liang Yan, Zhong-rui Bai, Jiang-tao Wang, Ming-yi Ding   +5 more
doaj   +1 more source

The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138

, 2016
We report on interferometric observations with the CHARA Array of two classical Wolf-Rayet stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds.
Farrington, Chris, Gies, Douglas R., Gordon, Kathryn, Hill, Grant M., Moffat, Anthony F. J., Pablo, Herbert, Ramiaramanantsoa, Tahina, Richardson, Noel D., Roy-Loubier, Olivier, Schaefer, Gail, Shenar, Tomer, St-Louis, Nicole, Williams, Peredur M.   +12 more
core   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

FEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Data-driven Stellar Intrinsic Colors and Dust Reddenings for Spectrophotometric Data: From the Blue-edge Method to a Machine Learning Approach

The Astrophysical Journal
Intrinsic colors (ICs) of stars are essential for studies on both stellar physics and dust reddening. In this work, we developed an XGBoost model to predict ICs with the atmospheric parameters T _eff , ${\rm{log}}\,g$ , and [M/H].
He Zhao, Shu Wang, Biwei Jiang, Jun Li, Dongwei Fan, Yi Ren, Xiaoxiao Ma   +6 more
doaj   +1 more source

Automatic Determination of Stellar Atmospheric Parameters and Construction of Stellar Spectral Templates of the Guoshoujing Telescope (LAMOST)

, 2011
A number of spectroscopic surveys have been carried out or are planned to study the origin of the Milky Way. Their exploitation requires reliable automated methods and softwares to measure the fundamental parameters of the stars.
A-Li Luo, Adelman-McCarthy, Allende Prieto, Allende Prieto, Alonso, An, Bagnulo, Bailer-Jones, Bailer-Jones, Bailer-Jones, Beers, Bond, Castelli, Cayrel, Covey, Hai-Ning Li, Hao-Tong Zhang, Hawley, Heap, Ivezić, Jian-Jun Chen, Jian-Nan Zhang, Jian-Rong Shi, Jofre, Jurić, Katz, Koleva, Kurucz, Lee, Lee, Luo, Luo, Makarova, Michielsen, Munari, Noguchi, Peng Wei, Percival, Philippe Prugniel, Prugniel, Prugniel, Prugniel, Prugniel, Ramsey, Recio-Blanco, Rockosi, Rodríguez-Merino, Schiavon, Sharina, Short, Siebert, Smolinski, Soubiran, Steinmetz, Su, Tull, Valdes, Vazdekis, Vogt, Wei-Xiang Dong, Wilhelm, Wylie-de Boer, Wyse, Xing, Yan-Chun Liang, Yanny, Yong-Heng Zhao, York, Yue Wu, Zacharias, Zhao, Zhao, Zhong-Rui Bai, Zhu, Zwitter, Zwitter   +75 more
core   +1 more source