Results 11 to 20 of about 47,444 (303)

Absolute magnitudes for late-type dwarf stars for Sloan photometry

Astronomische Nachrichten, 2005
We present a new formula for absolute magnitude determination for late-type dwarf stars as a function of (g-r) and (r-i) for Sloan photometry. The absolute magnitudes estimated by this approach are brighter than those estimated by colour-magnitude diagrams, and they reduce the luminosity function rather close to the luminosity function of Hipparcos.
Bilir, S., Karaali, S., Tuncel, S.
openaire   +3 more sources

Searching for Radio Late-type Dwarf Stars in the GLEAM-X DR1 Catalog

The Astrophysical Journal
We have developed a new method of multiwavelength data combination for the search of late-type radio dwarfs, and have put it into practice using GLEAM-X DR1 data.
Qichen Huang, Biwei Jiang, Zehao Zhang, Albert Zijlstra   +3 more
doaj   +4 more sources

Star Formation Histories of Dwarf Galaxies from the Colour-Magnitude Diagrams of Their Resolved Stellar Populations [PDF]

Advances in Astronomy, 2010
In this tutorial paper we summarize how the star formation (SF) history of a galactic region can be derived from the colour-magnitude diagram (CMD) of its resolved stars.
Michele Cignoni, Monica Tosi
doaj   +5 more sources

First Byurakan Spectral Survey. Late-Type Stars. Dwarfs

Communications of the Byurakan Astrophysical Observatory, 2022
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBSLTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectral plates. A systematic search and selection were carried out on a surface of ∼16 000deg2 on almost the whole area of the FBS.
Gigoyan, K. S., Gigoyan, K. K., Sarkissian, Alain, Kostandyan, G. R., Karapetyan, E., Meftah, Mustapha, Azatyan, N., Zamkotsian, F.   +7 more
openaire   +2 more sources

Spots and Flares in Hot Main Sequence Stars Observed by Kepler, K2, and TESS

Frontiers in Astronomy and Space Sciences, 2021
About 22,000 Kepler stars, 7,000 K2 stars, and nearly 60,000 TESS stars from sectors 1–24 have been classified according to variability type. A large proportion of stars of all spectral types appear to have periods in their light curves consistent with ...
Luis A. Balona
doaj   +1 more source

A Mini Atlas of H-Band Spectra of Southern Symbiotic Stars

Galaxies, 2023
Symbiotic stars are interacting binary systems composed of an evolved star (generally a late-type red giant) and a degenerate or dwarf companion in orbit close enough for mass transfer to occur. Understanding the status of the late-type star is important
Paula Esther Marchiano, María Laura Arias, Michaela Kraus, Michalis Kourniotis, Andrea Fabiana Torres, Lydia Sonia Cidale, Marcelo Borges Fernandes   +6 more
doaj   +1 more source

Magnetic Field Measurements of Low-mass Stars from High-resolution Near-infrared IGRINS Spectra

The Astronomical Journal, 2023
We present average magnetic field measurements derived from high-resolution near-infrared IGRINS spectra of a carefully selected sample of 28 M dwarfs. All 28 have reported magnetic field strengths in the literature.
Eunkyu Han, Ricardo López-Valdivia, Gregory N. Mace, Daniel T. Jaffe   +3 more
doaj   +1 more source

X-Ray Coronae from Single Late-Type Dwarf Stars [PDF]

Symposium - International Astronomical Union, 1998
Study of X-ray coronae from late-type stars with moderate resolution X-ray spectroscopy with ASCA, has led to the characterization of temperatures and measurements of elemental abundances in their coronae. Several RS CVn and Algol-type binary systems, and single late-type stars have been observed.
K.P. Singh, S.A. Drake, N.E. White
openaire   +1 more source

Living with a Red Dwarf: The Rotation–Age Relationships of M Dwarfs

The Astrophysical Journal Letters, 2023
Age is a fundamental stellar property, yet for many stars, it is difficult to reliably determine. For M dwarfs, it has been notoriously so. Due to their lower masses, core hydrogen fusion proceeds at a much slower rate in M dwarfs than it does in more ...
Scott G. Engle, Edward F. Guinan
doaj   +1 more source

Hurricane Genesis is Favorable on Terrestrial Exoplanets Orbiting Late-type M Dwarf Stars [PDF]

The Astrophysical Journal, 2020
Abstract Hurricanes are one of the most extreme storm systems that occur on Earth, characterized by strong rainfall and fast winds. The terrestrial exoplanets that will be characterized with future infrared space telescopes orbit M dwarf stars.
Thaddeus D. Komacek, Daniel R. Chavas, Dorian S. Abbot   +2 more
openaire   +2 more sources