Results 21 to 30 of about 207,560 (312)

Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer [PDF]

Astronomical Journal, 2021
We measured the angular diameters of 44 stars with the Navy Precision Optical Interferometer, obtaining uncertainties on the limb-darkened diameter of 2% or less for all but four stars.
E. Baines, J. Thomas Armstrong, James H. Clark, Jim Gorney, D. Hutter, A. Jorgensen, Casey Kyte, D. Mozurkewich, I. Nisley, J. Sanborn, H. Schmitt, G. V. van Belle   +11 more
semanticscholar   +1 more source

The Mass–Temperature Relation for B and Early A Stars Based on International Ultraviolet Explorer Spectra of Detached Eclipsing Binaries

The Astronomical Journal, 2023
Ultraviolet spectra were taken of 25 detached eclipsing binaries (DEBs) with spectral types O, B, and early A with the International Ultraviolet Explorer satellite in the 1150–1900 Å region. The spectra were compared with BOSZ model atmospheres.
Nancy Remage Evans, Mckenzie G. Ferrari, Joanna Kuraszkiewicz, Steven Silverberg, Joy Nichols, Guillermo Torres, Makenzi Fischbach   +6 more
doaj   +1 more source

Fundamental stellar parameters of benchmark stars from CHARA interferometry [PDF]

Astronomy & Astrophysics, 2020
Context.Benchmark stars are crucial as validating standards for current as well as future large stellar surveys of the Milky Way. However, the number of suitable metal-poor benchmark stars is currently limited, owing to the difficulty in determining reliable effective temperatures (Teff) in this regime.Aims.We aim to construct a new set of metal-poor ...
I. Karovicova, T. R. White, T. Nordlander, L. Casagrande, M. Ireland, D. Huber, P. Jofré   +6 more
openaire   +2 more sources

Rotation: a fundamental parameter of massive stars [PDF]

Symposium - International Astronomical Union, 1997
Massive stars are rapid rotators. Equatorial rotation velocities span the range vrot = 100–400 km s−1, with B stars rotating closest to their break-up speed vcrit (Howarth et al. 1997). During the last decade, many observations have revealed unusual surface abundances that may require additional internal mixing (beyond that of simple convection and ...
Langer, Norbert, Heer, A., Fliegner, Jana Ute   +2 more
openaire   +2 more sources

Fundamental Parameters of the W Serpentis Stars [PDF]

International Astronomical Union Colloquium, 1989
AbstractApplication of digital cross-correlation spectroscopy to the spectra of the W Serpentis binaries SX Cas and RX Cas has allowed an accurate determination of the orbits and rotations of the (mass-losing) K-subgiant secondary components. The distortion of the primary radial-velocity curves due to the influence of the prominent accretion disks in ...
J. Andersen, B. Nordström
openaire   +1 more source

When a Period Is Not a Full Stop: Light Curve Structure Reveals Fundamental Parameters of Cepheid and RR Lyrae Stars [PDF]

Monthly notices of the Royal Astronomical Society, 2019
The period of pulsation and the structure of the light curve for Cepheid and RR Lyrae variables depend on the fundamental parameters of the star: mass, radius, luminosity, and effective temperature.
E. Bellinger, S. Kanbur, A. Bhardwaj, M. Marconi   +3 more
semanticscholar   +1 more source

The fundamental parameters of the roAp starγ Equulei [PDF]

Astronomy & Astrophysics, 2011
Physical processes working in the stellar interiors as well as the evolution of stars depend on some fundamental stellar properties, such as mass, radius, luminosity, and chemical abundances. A classical way to test stellar interior models is to compare the predicted and observed location of a star on theoretical evolutionary tracks in a H-R diagram ...
Perraut, K., Brandão, I., Mourard, D., Cunha, M., Bério, P., Bonneau, D., Chesneau, O., Clausse, J.M., Delaa, O., Marcotto, A., Roussel, A., Spang, A., Stee, P., Tallon-Bosc, I., Mcalister, H., ten Brummelaar, T., Sturmann, J., Sturmann, L., Turner, N., Farrington, C., Goldfinger, P.J.   +20 more
openaire   +2 more sources

Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer [PDF]

, 2017
We present the fundamental properties of 87 stars based on angular diameter measurements from the Navy Precision Optical Interferometer, 36 of which have not been measured previously using interferometry.
E. Baines, J. T. Armstrong, H. Schmitt, R. Zavala, J. Benson, D. Hutter, C. Tycner, G. Belle   +7 more
semanticscholar   +1 more source

FUNDAMENTAL PARAMETERS OF SUPERGIANT STAR HD 40589 (A0Iab)

Odessa Astronomical Publications, 2023
У цій роботі були визначені фундаментальні параметри зорі-надгігінта HD 40589 (A0Iab), а саме ефективна температура (Teff), прискорення сили тяжіння (log g), мікротурбулентна швидкість (ξt) і металічність [Fe/H]. Відстань до зорі 1734 пк. Висота над площиною Галактики становить 67,5 пк.
Z. A. Samedov, U. R. Rustem, G. M. Hajiyeva, Z. F. Aliyeva   +3 more
openaire   +3 more sources

Benchmarking the fundamental parameters of Ap stars with optical long-baseline interferometric measurements

Astronomy & Astrophysics, 2020
Context. The variety of physical processes at play in chemically peculiar stars makes it difficult to determine their fundamental parameters. In particular, for the magnetic ones, called Ap stars, the strong magnetic fields and the induced spotted ...
K. Perraut, M. Cunha, Anna Romanovskaya, D. Shulyak, T. Ryabchikova, V. Hocdé, N. Nardetto, D. Mourard, A. Meilland, F. Morand, I. Tallon-Bosc, C. Farrington, C. Lanthermann   +12 more
semanticscholar   +1 more source