Results 1 to 10 of about 47,444 (303)
The Astrophysical Journal, 2023 About 70%–80% of stars in our solar and Galactic neighborhood are M dwarfs. They span a range of low masses and temperatures relative to solar-type stars, facilitating molecule formation throughout their atmospheres.
Aishwarya R. Iyer +4 more
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The Astronomical Journal, 2023 Variability in the far-ultraviolet (FUV) emission produced by stellar activity affects photochemistry and heating in orbiting planetary atmospheres. We present a comprehensive analysis of the FUV variability of GJ 436, a field-age M2.5V star ( P _rot ...
R. O. Parke Loyd +8 more
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Late-type dwarf galaxies in the Virgo cluster -- II. Star formation properties [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 We study star-formation-inducing mechanisms in galaxies through multi- wavelength measurements of a sample of dwarf galaxies in the Virgo cluster described in paper I. Our main goal is to test how star formation inducing mechanisms depend on several parameters of the galaxies, such as morphological type and hydrogen content.
Almoznino, Elchanan, Brosch, Noah
openaire +2 more sources
Linking chromospheric activity and magnetic field properties for late-type dwarf stars
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric $\log {R^{\prime }_{\rm {HK}}}$ activity and the surface-averaged longitudinal magnetic field, Bl, giving the opportunity to probe the relationship between large-scale stellar magnetic fields and chromospheric manifestations of magnetism.
E L Brown +11 more
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On the Origins of Extreme Velocity Stars as Revealed by Large-scale Galactic Surveys
The Astronomical Journal, 2023 We assemble a large sample of 12,784 high-velocity stars with total velocity V _GSR ≥ 300 km s ^−1 , selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH DR2, and Gaia EDR3.
Qing-Zheng Li +5 more
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Prospecting in ultracool dwarfs : Measuring the metallicities of mid- and late-m dwarfs [PDF]
, 2014 © 2014. The American Astronomical Society. All rights reserved.Metallicity is a fundamental parameter that contributes to the physical characteristics of a star.
Aihara +72 more
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CoRoT 101186644: A transiting low-mass dense M-dwarf on an eccentric 20.7-day period orbit around a late F-star [PDF]
, 2013 We present the study of the CoRoT transiting planet candidate 101186644, also named LRc01_E1_4780. Analysis of the CoRoT lightcurve and the HARPS spectroscopic follow-up observations of this faint (m_V = 16) candidate revealed an eclipsing binary ...
Alonso, R. +12 more
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Variables in the Southern Polar Region Evryscope 2016 Dataset [PDF]
, 2019 The regions around the celestial poles offer the ability to find and characterize long-term variables from ground-based observatories. We used multi-year Evryscope data to search for high-amplitude (~5% or greater) variable objects among 160,000 bright ...
Barlow, Brad N. +8 more
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No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars
The Astronomical Journal, 2023 Reliable detections of Earth-sized planets in the habitable zone remain elusive in the Kepler sample, even for M dwarfs. The Kepler sample was once thought to contain a considerable number of M-dwarf stars ( T _eff < 4000 K), which hosted enough Earth ...
Galen J. Bergsten +5 more
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They might be giants: luminosity class, planet frequency, and planet-metallicity relation of the coolest Kepler target stars [PDF]
, 2012 We estimate the stellar parameters of late K and early M type Kepler target stars. We obtain medium resolution visible spectra of 382 stars with Kp-J>2 (~K5 and later spectral type).
Gaidos, Eric +3 more
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