Results 81 to 90 of about 241,576 (378)

A Recent Reacceleration of the Local Bubble Revealed by Kinematics of Young Star Associations

The Astrophysical Journal Letters
The low-density region of the interstellar medium where the Sun is located is known as the Local Bubble, a cavity filled with high-temperature and low-density plasma that may be created by a series of supernova (SN) explosions over the past 14 Myr ...
Guang-Ya Zeng, Guang-Xing Li, Bing-Qiu Chen, Ji-Xuan Zhou, Martin G. H. Krause   +4 more
doaj   +1 more source

The –M disk Relationship for Herbig Ae/Be Stars: A Lifetime Problem for Disks with Low Masses?

The Astronomical Journal, 2023
The accretion of material from protoplanetary disks onto their central stars is a fundamental process in the evolution of these systems and a key diagnostic in constraining the disk lifetime. We analyze the relationship between the stellar accretion rate
Sierra L. Grant, Lucas M. Stapper, Michiel R. Hogerheijde, Ewine F. van Dishoeck, Sean Brittain, Miguel Vioque   +5 more
doaj   +1 more source

The Coronal Evolution Of Pre-Main-Sequence Stars

The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS19), 2016
Contributed talk, plenary session.
Gregory, Scott G., Adams, Fred C., Davies, Claire L.   +2 more
openaire   +2 more sources

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

Dust Envelopes around Massive Young Stellar Objects [PDF]

Journal of Astronomy and Space Sciences, 2008
We investigate the spectral energy distributions (SEDs) of Massive Young Stellar Objects (MYSOs) using the various infrared observational data including the Infrared Space Observatory (ISO) data.
Kyung-Won Suh
doaj   +1 more source

Pre-Main Sequence Ap Star LkHα 324/B in LDN 988 Star Forming Region

Universe, 2023
We present results of the investigation of the star LkHα 324/B, which belongs to the starforming dark cloud LDN 988. Based on high resolution spectroscopy, we determined its fundamental parameters as Teff=11,175±130 K, log(L*/L⊙)=1.87±0.07.
Ilya Potravnov, Tatiana Ryabchikova, Svetlana Artemenko, Maxim Eselevich   +3 more
doaj   +1 more source

The Frequency of Mid-Infrared Excess Sources in Galactic Surveys [PDF]

, 2006
We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8 micron mid-infrared extraphotospheric excesses in the MidCourse Space Experiment (MSX) and Spitzer Space Telescope Galactic Legacy MidPlane Survey Extraordinaire (GLIMPSE) surveys.
A. J. Monson, B. A. Whitney, B. L. Babler, B. Uzpen, Barrado, C. J. Cyganowski, C. Watson, D. E. Backman, D. F. Watson, D. P. Clemens, E. Churchwell, E. P. Mercer, F. Heitsch, H. A. Kobulnicky, Hog E., J. M. Jackson, J. Rho, J. S. Mathis, K. E. Devine, M. Cohen, M. G. Wolfire, M. J. Pierce, M. J. Wolff, M. R. Meade, M. S. Povich, M. Sewilo, Oudmaijer R. D., Plets H., R. A. Benjamin, R. Indebetouw, S. Bracker, S. R. Stolovy, Sylvester R. J., T. M. Bania, T. P. Robitaille   +34 more
core   +3 more sources

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

The newfound relationship between extrachromosomal DNAs and excised signal circles

FEBS Letters, EarlyView.
Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley   +1 more source

Instability strip for pre-main-sequence stars [PDF]

Communications in Asteroseismology, 2007
We apply the Time Dependent Convection (TDC) treatment presented in Grigahcene et al. (2005) to the study of Pre-main sequence pulsating stars. The stabilization of the p-modes at the red edge of the Instability Strip (IS) is obtained by our models. The theoretical IS obtained with Mixing Length (ML) parameter α =1.8 is compared to observations and a ...
Grigahcene, A., Dupret, Marc-Antoine, Garrido, R., Gabriel, Maurice, Scuflaire, Richard   +4 more
openaire   +1 more source