Differential rotation of main sequence F stars [PDF]
, 2004 The differential rotation of a 1.2 Mzero age MS star (spectral type F8) is computed and the results are compared with those from a similar model of the Sun.
M. Kueker, G. Ruediger
semanticscholar +1 more source
The impact of a fossil magnetic field on dipolar mixed-mode frequencies in sub- and red-giant stars [PDF]
, 2020 Stars more massive than $\sim 1.3$ M$_\odot$ are known to develop a convective core during the main-sequence: the dynamo process triggered by this convection could be the origin of a strong magnetic field inside the core of the star, trapped when it becomes stably stratified and for the rest of its evolution.
arxiv +1 more source
Determining the effective temperatures of G- and K-type giants and supergiants based on observed photometric indices [PDF]
Kinematics and Physics of Celestial Bodies, 2014, Vol. 30, No. 5,
pp. 244-254, 2014 A method for determining the effective temperature Teff of G- and K-type giants and supergiants is proposed. The method is based on the use of two photometric indices free from the interstellar absorption influence: the Q index in the UBV photometric system and the [c1] index in the uvby system.
arxiv +1 more source
Resolving the delta Andromedae spectroscopic binary with direct imaging [PDF]
, 2015 We present a direct image of the innermost companion to the red giant delta Andromedae using the Stellar Double Coronagraph at the Palomar Observatory.
Bottom, Michael +6 more
core +2 more sources
, 1989 The observed frequency distribution of near-IR excesses for a sample of 83 stars in the Taurus-Auriga star-forming complex is used to provide an estimate of the number of solar-type premain-sequence (PMS) stars surrounded by circumstellar disks.
K. Strom +4 more
semanticscholar +1 more source
Spectroscopy of hot subdwarf binaries
Open Astronomy, 2018 We present a status report of our spectroscopic analysis of subdwarf binaries consisting of a subdwarf and a F/G/K-type main-sequence companion. These systems selected from SDSS photometry show significant excess in the (infra-)red which can not be ...
Kreuzer Simon +2 more
doaj +1 more source
Multiplicity among solar-type stars IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs [PDF]
A&A 619, A81 (2018), 2018 Context. The statistical properties of binary stars are clues for understanding their formation process. A radial velocity survey was carried on amongst nearby G-type stars and the results were published in 1991. Aims. The survey of radial velocity measurements was extended towards K-type stars. Methods.
arxiv +1 more source
Relative abundances of CO2, CO, and CH4 in atmospheres of Earth-like lifeless planets [PDF]
, 2023 Carbon is an essential element for life on Earth, and the relative abundances of major carbon species (CO2, CO, and CH4) in the atmosphere exert fundamental controls on planetary climate and biogeochemistry. Here, we employed a theoretical model of atmospheric chemistry to investigate diversity in the atmospheric abundances of CO2, CO, and CH4 on Earth-
arxiv +1 more source
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha [PDF]
, 2009 We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon I star-forming cloud with ages of 3-5 Myr.
A. Collier Cameron +74 more
core +5 more sources
The variation of tidal dissipation in the convective envelope of low-mass stars along their evolution [PDF]
, 2015 Since 1995, more than 1500 exoplanets have been discovered around a large diversity of host stars (from M- to A-type stars). Tidal dissipation in stellar convective envelopes is a key actor that shapes the orbital architecture of short-period systems ...
Mathis, S.
core +4 more sources