Results 61 to 70 of about 74,495 (201)

Molecules as magnetic probes of starspots

, 2015
Stellar dynamo processes can be explored by measuring the magnetic field. This is usually obtained using the atomic and molecular Zeeman effect in spectral lines.
Afram, Nadine, Berdyugina, Svetlana V.
core   +1 more source

POLLUX : a database of synthetic stellar spectra [PDF]

, 2010
Synthetic spectra are needed to determine fundamental stellar and wind parameters of all types of stars. They are also used for the construction of theoretical spectral libraries helpful for stellar population synthesis.
A. Lèbre, A. Palacios, B. Plez, Bertone, Bessell, Bonifacio, Bouret, Bouret, Bouret, Castelli, Castelli, Castelli, Castelli, Castor, Deharveng, E. Josselin, Edvardsson, Edvardsson, F. Martins, García-Hernández, Gebran, Gebran, Gustafsson, Gustafsson, Henyey, Hillier, Hillier, Hillier, Hubeny, Hubrig, Kurucz, Kurucz, Lanz, Le Petit, Levesque, Levesque, Levesque, M. Belmas, M. Gebran, Martins, Martins, Martins, Martins, Massey, Munari, Munari, Pauldrach, Peytremann, Plez, Plez, Recio-Blanco, Seaton, Sneden, Wahlin, Zavagno, Önehag   +55 more
core   +1 more source

Examination of the relationship between spectral type and stellar rotational velocity in $$\sim \,$$50,000 single stars

Journal of Astrophysics and Astronomy
In this study, we present the results of the relationship between spectral type (ST) and the projected stellar rotational velocity ($vsini$), utilising a sample of approximately 50,000 single stars across a range of evolutionary stages. The STs of the stars included in this study span a broad range, from O0 to M9.
Boran Mert, Usta Ahmet, Kayhan Cenk
openaire   +3 more sources

Evolution of Stellar Activity and Habitable Zone. II. Ca II H and K Emissions of Late-type Dwarfs

The Astrophysical Journal Supplement Series
Stellar chromospheric activity serves as a valuable proxy for estimating stellar ages, though its applicable range and accurate functional form are still debated.
Henggeng Han, Song Wang, Xue Li, Chuanjie Zheng, Jiahui Wang, Jifeng Liu   +5 more
doaj   +1 more source

Comparative studies of Population Synthesis Models in the frame work of modified Str\"{o}mgren filters

, 2014
Evolutionary models form a vital part of stellar population research to understand their evolution, but despite their long history of development, they often misrepresent and misinterpret the properties of stellar population observed through broadband ...
Hensler, Gerhard, Rakos, Karl, Sreedhar, Yuvraj Harsha   +2 more
core   +1 more source

The Wind beneath My Wings. I. Spectral Types and Multiplicity of the Central Stars Supporting Stellar Bow Shock Nebulae

The Astrophysical Journal Supplement Series, 2020
Abstract Arcuate mid-infrared nebulae known as stellar bow shock nebulae (SBNe) have been previously hypothesized to be supported by the strong stellar winds and/or luminosity of massive early-type stars. We present an optical spectroscopic survey of 84 stars identified from mid-infrared images as candidate SBN-supporting stars.
William T Chick, Henry A. Kobulnicky, Danielle P. Schurhammer, Julian E. Andrews, Matthew S. Povich, Elle R. Buser, Don M. Dixon, Michael J. Lindman, Stephan A. Munari, Grace M. Olivier, Rebecca L. Sorber, Heather N. Wernke   +11 more
openaire   +1 more source

X-RAY PROPERTIES OF K-SELECTED GALAXIES AT 0.5 <z< 2.0: INVESTIGATING TRENDS WITH STELLAR MASS, REDSHIFT AND SPECTRAL TYPE [PDF]

The Astrophysical Journal, 2014
Comment: 9 pages, 9 figures, ApJ ...
Jones, Therese M., Kriek, Mariska, Van Dokkum, Pieter G., Brammer, Gabriel, Franx, Marijn, Greene, Jenny E., Labbe, Ivo, Whitaker, Katherine E.   +7 more
openaire   +3 more sources

Metal Pipe: A Broadly Applicable Stellar Abundance Pipeline Using Isochronal Parameters

The Astrophysical Journal
Characterizing exoplanet host stars at the population level requires a method of homogeneously characterizing stellar properties across all spectral types.
Jared R. Kolecki, Lauren M. Weiss
doaj   +1 more source

Principal Component Analysis of SDSS Stellar Spectra

, 2010
We apply Principal Component Analysis (PCA) to ~100,000 stellar spectra obtained by the Sloan Digital Sky Survey (SDSS). In order to avoid strong non-linear variation of spectra with effective temperature, the sample is binned into 0.02 mag wide ...
Abazajian, Allende Prieto, Allende Prieto, Amy E. Kimball, Beers, Connolly, Connolly, Covey, Eisenstein, Eisenstein, Fan, Finlator, Gunn, Ivezić, Ivezić, Ivezić, Lee, Lee, Lenz, Richards, Rosalie C. McGurk, Schlegel, Sirko, Smolčić, Strauss, Yanny, Yip, York, Željko Ivezić   +28 more
core   +1 more source

Spectral Feature Extraction Using Partial and General Method

Advances in Astronomy, 2021
With the rapid growth in astronomical spectra produced by large sky survey telescopes, traditional manual classification processes can no longer fulfill the requirements of precision and efficiency of spectral classification.
Bin Jiang, Xi Fang, Yang Liu, Xingzhu Wang, Jie Liu   +4 more
doaj   +1 more source