Results 61 to 70 of about 47,514 (302)
Time-Dependent Variations of Accretion Disk [PDF]
Journal of Astronomy and Space Sciences, 1987 In dward nova we assume the primary star as a white dwarf and the secondary as the late type star which filled Roche lobe. Mass flow from the secondary star leads to the formation of thin accretion disk around the white dwarf.
Hye-Weon Na +2 more
doaj
MONITORING OF SPECTRAL VARIATIONS OF MIRA-TYPE AND SEMIREGULAR VARIABLE STARS
Odessa Astronomical Publications, 2017 The results of monitoring of a sample of late-type variable stars (Mira Ceti-type and semiregulars) are reported. Since 1980 a sample of 60 stars has been observed in the maser line of the H2O molecule at a wavelength of 1.35 cm. These observations are
G. M. Rudnitskij
doaj +1 more source
, 2013 Knowledge of late K and M dwarf metallicities can be used to guide planet searches and constrain planet formation models. However, the determination of metallicities of late-type stars is difficult because visible wavelength spectra of their cool ...
Brewer, John M. +4 more
core +1 more source
Resolved Spectroscopy of M Dwarf/L Dwarf Binaries. II. 2MASS J 17072343-0558249AB [PDF]
, 2006 We present IRTF SpeX observations of the M/L binary system 2MASS J17072343-0558249. SpeX imaging resolves the system into a 1"01+/-0.17 visual binary in which both components have red near infrared colors.
Adam J. Burgasser +7 more
core +2 more sources
Star formation histories of late-type dwarfs outside the Local Group
, 2001 We describe the star formation histories of three late-type dwarfs located outside the Local Group: IZw18, NGC1569 and NGC1705. The results are based on the application of the method of synthetic colour-magnitude diagrams to deep HST photometric data. All the examined galaxies were already forming stars at the reached lookback time and show no evidence
Tosi, M. +3 more
openaire +2 more sources
Contributions of late-type dwarf stars to the soft X-ray diffuse background
The Astrophysical Journal, 1990 Comprehensive calculations of the contribution of late-type dwarf stars to the soft X-ray diffuse background are presented. The mean X-ray luminosity as derived from optically and X-ray selected samples is examined, using the Bahcall-Soneira Galaxy model to describe the spatial distribution of stars and recent results on the X-ray spectra.
J. H. M. M. Schmitt, S. L. Snowden
openaire +1 more source
Disentangling the Planet from the Star in Late-Type M Dwarfs: A Case Study of TRAPPIST-1g [PDF]
The Astronomical Journal, 2018 Abstract The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets because of the presence of strong molecular features in the stellar atmosphere. TRAPPIST-1 is an ultracool dwarf, host to seven transiting planets, and contains its own molecular signatures that can potentially ...
H. R. Wakeford +12 more
openaire +3 more sources
Plant Genetic Engineering: Technological Pathways, Application Scenarios, and Future Directions
Advanced Science, EarlyView.This review maps the fast‐evolving landscape of plant genetic engineering, linking enabling platforms with trait‐focused applications in architecture optimization, stress resilience, yield improvement, and quality enhancement. It highlights how genome editing, transgenic strategies, and emerging multi‐gene approaches reshape breeding pipelines, while ...
Peilin Wang +4 more
wiley +1 more source
Optical Studies of Twenty Longer-Period Cataclysmic Binaries
, 2010 We obtained time-series radial velocity spectroscopy of twenty cataclysmic variable stars, with the aim of determining orbital periods P_orb. All of the stars reported here prove to have P_orb > 3.5 h.
Peters, Christopher S. +2 more
core +1 more source
Studies of late-type dwarfs. V - Theoretical models for lower main-sequence stars
The Astrophysical Journal, 1983 New theoretical stellar models for the lower end of the main sequence have been computed for a wide range in metallicity. These models are based on new low-temperature opacities, which include the contributions from the most important molecules, as well as published model atmospheres, which guided the choice of surface boundary conditions.
D. A. Vandenberg +3 more
openaire +1 more source