Results 31 to 40 of about 462 (193)
The domain of Doradus variables in the Hertzsprung-Russell diagram [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 70 new ? Doradus candidates were identified from Hipparcos photometry, which represents more than a doubling of the presently known number. Selecting the objects with good evidence for multiperiodicity, it is found that these stars, together with bona fide members of the class, occupy a well-defined region in a colour-magnitude diagram.
G. Handler
openalex +3 more sources
Resolving stellar populations with integral field spectroscopy
Astronomische Nachrichten, Volume 340, Issue 9-10, Page 989-995, November‐December 2019., 2019 Abstract High‐performance instruments at large ground‐based telescopes have made integral field spectroscopy (IFS) a powerful tool for the study of extended objects such as galaxies, nebulae, or even larger survey fields on the sky. Here, we discuss the capabilities of IFS for the study of resolved stellar populations, using the new method of point ...
Martin M. Roth +2 more
wiley +1 more source
Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference
The Astrophysical Journal, 2023 Knowledge of stellar atmospheric parameters ( T _eff , $\mathrm{log}g$ , [Fe/H]) of M dwarfs can be used to constrain both theoretical stellar models and Galactic chemical evolutionary models, and guide exoplanet searches, but their determination is ...
C. Duque-Arribas +5 more
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The effects of gravity on the climate and circulation of a terrestrial planet
Quarterly Journal of the Royal Meteorological Society, Volume 145, Issue 723, Page 2627-2640, July 2019 Part B., 2019 The climate and circulation of a terrestrial planet are governed by many orbital and planetary parameters, but here we explore the effect of changing the Newtonian gravitational acceleration. We consider how radiative and dynamical processes are altered, with subsequent changes in water vapour found to be particularly important.
Stephen I. Thomson, Geoffrey K. Vallis
wiley +1 more source
Tracing the origin of neutron-capture elements in the metalpoor star HE 1244-3036 [PDF]
EPJ Web of ConferencesWe present results from a detailed abundance analysis of a star HE 1244-3036, based on a high resolution (R ∼ 50000) SUBARU/HDS spectrum. The wavelength coverage is from 3510 to 5310 Å. Our estimated metallicity [Fe/H] ∼ −2.5 and carbon abundance ([C/Fe]
Dutta Debasish, Goswami Aruna
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Anomaly detection by robust statistics
WIREs Data Mining and Knowledge Discovery, Volume 8, Issue 2, March/April 2018., 2018 Fitting a line to data with outliers: classical (red) and robust (blue). Real data often contain anomalous cases, also known as outliers. These may spoil the resulting analysis but they may also contain valuable information. In either case, the ability to detect such anomalies is essential.
Peter J. Rousseeuw, Mia Hubert
wiley +1 more source
Advances in High Energy Physics, Volume 2015, Issue 1, 2015., 2015 Some recent important results on black hole (BH) quantum physics concerning the BH effective state and the natural correspondence between Hawking radiation and BH quasi‐normal modes (QNMs) are reviewed, clarified, and refined. Such a correspondence permits one to naturally interpret QNMs as quantum levels in a semiclassical model. This is a model of BH
Christian Corda, Maxim Khlopov
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Astronomische Nachrichten, Volume 347, Issue 1, January 2026.ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
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Confirmation of the Luminous Blue Variable Status of MWC 930
Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014 We present spectroscopic and photometric observations of the emission‐line star MWC 930 (V446 Sct) during its long‐term optical brightening in 2006–2013. Based on our earlier data we suggested that the object has features found in Luminous Blue Variables (LBV), such as a high luminosity (~3 105 L⊙), a low wind terminal velocity (~140 km s−1), and a ...
A. S. Miroshnichenko +17 more
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Properties of Anomalous and Type II Cepheids in the Small and Large Magellanic Clouds
EPJ Web of Conferences, 2017 The Small Magellanic Cloud (SMC) and Large Magellanic Cloud (LMC) give us the possibility to study individual variable star types in a new way. Literature data provide us with photometric information about objects from the ultraviolet to the infrared ...
Jurkovic Monika I. +1 more
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