Results 11 to 20 of about 2,699,264 (331)

“In-System” Fission-Events: An Insight into Puzzles of Exoplanets and Stars?

Universe, 2021
In expansion of our recent proposal that the solar system’s evolution occurred in two stages—during the first stage, the gaseous giants formed (via disk instability), and, during the second stage (caused by an encounter with a particular stellar-object ...
Elizabeth P. Tito, Vadim I. Pavlov
doaj   +2 more sources

Stellar spectral classification and feature evaluation based on a random forest [PDF]

Research in Astronomy and Astrophysics, 2019
With the availability of multi-object spectrometers and the design and operation of some large scale sky surveys, the issue of how to deal with enormous quantities of spectral data efficiently and accurately is becoming more and more important. This work
Xiangru Li, Yang-Tao Lin, Kai-bin Qiu
semanticscholar   +3 more sources

THE SAMI GALAXY SURVEY: REVISITING GALAXY CLASSIFICATION THROUGH HIGH-ORDER STELLAR KINEMATICS [PDF]

, 2016
Recent cosmological hydrodynamical simulations suggest that integral field spectroscopy can connect the high-order stellar kinematic moments h3 (∼skewness) and h4 (∼kurtosis) in galaxies to their cosmological assembly history.
J. V. D. Sande, J. Bland-Hawthorn, L. Fogarty, L. Cortese, F. D’Eugenio, S. Croom, N. Scott, J. Allen, S. Brough, J. Bryant, G. Cecil, M. Colless, W. J. Couch, R. Davies, P. Elahi, C. Foster, G. Goldstein, M. Goodwin, B. Groves, I. Ho, Hyunjin Jeong, D. H. Jones, I. Konstantopoulos, J. Lawrence, S. Leslie, Ángel R. López-Sánchez, R. McDermid, R. McElroy, A. Medling, Sree Oh, M. Owers, S. Richards, A. Schaefer, R. Sharp, S. Sweet, D. Taranu, C. Tonini, C. Walcher, S. K. Yi   +38 more
semanticscholar   +3 more sources

Classification of Stellar Spectral Data Using SVM [PDF]

, 2004
In this paper a new technique is developed on stellar spectral classification. Because stellar spectral data sets are usually extremely noisy, wavelet de-noising method is proposed to reduce noise first. Then the support vector machines (SVM) is used for the classification.
Fei Xing, Ping Guo 0002
openaire   +2 more sources

Galaxy morphology classification: are stellar circularities enough? [PDF]

Serbian Astronomical Journal
We present a preliminary study exploring whether the stellar orbital circularity of simulated galaxies, available from precomputed catalogs in the IllustrisTNG project, can be used as a proxy for a broad morphological classification. We focus on
Baucalo Katarina, Mitrašinović Ana
doaj   +3 more sources

Automated Morgan Keenan Classification of Observed Stellar Spectra Collected by the Sloan Digital Sky Survey Using a Single Classifier

Astronomical Journal, 2019
The classification of stellar spectra is a fundamental task in stellar astrophysics. Stellar spectra from the Sloan Digital Sky Survey are applied to standard classification methods, k-nearest neighbors and random forest, to automatically classify the ...
Michael J. Brice, Razvan Andonie
semanticscholar   +3 more sources

Automated classification of stellar spectra [PDF]

, 2020
Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2020, Tutor: Josep Maria Solanes ...
Jiménez Palau, Cristina
openaire   +2 more sources

Gaia Data Release 3. Apsis. III. Non-stellar content and source classification [PDF]

Astronomy & Astrophysics, 2022
Context. As part of the third Gaia data release, we present the contributions of the non-stellar and classification modules from the eighth coordination unit (CU8) of the Data Processing and Analysis Consortium, which is responsible for the determination
L. Delchambre, C. Bailer-Jones, I. Bellas-Velidis, R. Drimmel, D. Garabato, R. Carballo, D. Hatzidimitriou, D. Marshall, R. Andrae, C. Dafonte, E. Livanou, Morgan Fouesneau, E. Licata, H. Lindstrøm, M. Manteiga, C. Robin, A. Silvelo, A. Aramburu, M. A. Álvarez, J. Bakker, A. Bijaoui, N. Brouillet, E. Brugaletta, A. Burlacu, L. Casamiquela, L. Chaoul, A. Chiavassa, G. Contursi, W. J. Cooper, O. Creevey, A. Dapergolas, P. Laverny, C. Demouchy, T. Dharmawardena, B. Edvardsson, Y. Frémat, P. Garcı́a-Lario, M. García-Torres, A. Gavel, A. Gomez, I. González-Santamaría, U. Heiter, A. Piccolo, M. Kontizas, G. Kordopatis, A. Korn, A. Lanzafame, Y. Lebreton, A. Lobel, A. Lorca, A. Romeo, F. Marocco, N. Mary, C. Nicolas, C. Ordenovic, F. Pailler, P. Palicio, L. Pallas-Quintela, C. Panem, B. Pichon, E. Poggio, A. Recio-Blanco, F. Riclet, J. Rybizki, R. Santoveña, L. Sarro, M. Schultheis, M. Ségol, I. Ślęzak, R. Smart, R. Sordo, C. Soubiran, M. Suveges, F. Thévenin, G. T. Elipe, A. Ulla, E. Utrilla, A. Vallenari, E. W. Dillen, H. Zhao, J. Zorec   +80 more
semanticscholar   +1 more source

Gaia Data Release 3. Validating the classification of variable young stellar object candidates [PDF]

Astronomy & Astrophysics, 2022
Context. The Gaia third Data Release (DR3) presents the first catalogue of full-sky variable Young Stellar Object (YSO) candidates observed by the Gaia space telescope during the initial 34 months of science operations. Aims.
G. Marton, P. 'Abrah'am, L. Rimoldini, M. Audard, M. Kun, Z. Nagy, 'A. K'osp'al, L. Szabados, B. Holl, P. Gavras, N. Mowlavi, K. Nienartowicz, G. D. Fombelle, I. Lecoeur-Taibi, L. Karbevska, P. Garcı́a-Lario, L. Eyer   +16 more
semanticscholar   +1 more source

Mira variables in the Milky Way’s nuclear stellar disc: discovery and classification [PDF]

Monthly notices of the Royal Astronomical Society, 2022
The properties of the Milky Way’s nuclear stellar disc give crucial information on the epoch of bar formation. Mira variables are promising bright candidates to study the nuclear stellar disc, and through their period–age relation dissect its star ...
J. Sanders, N. Matsunaga, D. Kawata, L. Smith, D. Minniti, P. Lucas   +5 more
semanticscholar   +1 more source