Results 21 to 30 of about 74,495 (201)
Empirical Isochrones for Low Mass Stars in Nearby Young Associations [PDF]
, 2015 Absolute ages of young stars are important for many issues in pre-main sequence stellar and circumstellar evolution but are long recognized as difficult to derive and calibrate.
Herczeg, Gregory J. +1 more
core +2 more sources
Evidence for Misalignment between Debris Disks and Their Host Stars
The Astrophysical Journal, 2023 We place lower limits on the obliquities between debris disks and their host stars for 31 systems by comparing their disk and stellar inclinations.
Spencer A. Hurt, Meredith A. MacGregor
doaj +1 more source
Atoms, 2023 Stellar atmospheres separate the hot and dense stellar interiors from the emptiness of space. Radiation escapes from the outermost layers of a star, carrying direct physical information.
Carlos Allende Prieto
doaj +1 more source
Stellar spectral-type (mass) dependence of the dearth of close-in planets around fast-rotating stars
Astronomy & Astrophysics, 2023 In 2013 a dearth of close-in planets around fast-rotating host stars was found using statistical tests on Kepler data. The addition of more Kepler and Transiting Exoplanet Survey Satellite (TESS) systems in 2022 filled this region of the diagram of stellar rotation period ( P rot ) versus the planet orbital period ( P orb ).
García, R. +10 more
openaire +4 more sources
On the Construction of a New 3D Atlas of Stellar Spectral Energy Distributions
Open Astronomy, 2014 Modern spectrophotometric atlases are burdened with significant systematic errors. In particular, the problems of spectrum calibration in the ultraviolet region are not solved; different parts of the spectrum are not thoroughly fit to each other; spectra
Mironov A. V. +4 more
doaj +1 more source
Quantitative Stellar Spectral Classification. II. Early Type Stars
, 2002 The method developed by Stock and Stock (1999) for stars of spectral types A to K to derive absolute magnitudes and intrinsic colors from the equivalent widths of absorption lines in stellar spectra is extended to B-type stars. Spectra of this type of stars for which the Hipparcos Catalogue gives parallaxes with an error of less than 20% were observed ...
Stock, M. J. +3 more
openaire +2 more sources
Spectral energy distributions of type 2 quasi-stellar objects: obscured star formation at high redshifts [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We present new mid-infrared and submillimetre observations for a sample of eight high-redshift type 2 quasi-stellar objects (QSOs) located in the Chandra Deep Field-South. The sources are X-ray absorbed with luminosities in excess of 10 44 erg s ―1 .
Rigopoulou, D. +8 more
openaire +3 more sources
A Census of the Stellar Populations in the Sco-Cen Complex
The Astronomical Journal, 2021 I have used high-precision photometry and astrometry from the early installment of the third data release of Gaia (EDR3) to perform a survey for members of the stellar populations within the Sco-Cen complex, which consist of Upper Sco, UCL/LCC, the V1062
K. L. Luhman
doaj +1 more source
The Astrophysical Journal, 2023 Stellar rotation is crucial for studying stellar evolution, since it provides information about age, angular momentum transfer, and magnetic fields of stars.
Alexandre Araújo, Adriana Valio
doaj +1 more source
, 2006 We present an automated procedure for the derivation of atmospheric parameters (Teff, log g, [M/H]) and individual chemical abundances from stellar spectra.
Bijaoui, A. +2 more
core +3 more sources