Dissertations / Theses on the topic 'Stellar initial mass function'
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Nelson, Katy. "On the origin of the stellar initial mass function and multiple stellar systems." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/65971/.
Full textCatalán, Ruiz Sílvia. "Testing the initial-final mass relationship of white dwarfs." Doctoral thesis, Universitat Politècnica de Catalunya, 2008. http://hdl.handle.net/10803/6591.
Full textSince white dwarfs are long-lived objects, they also constitute useful objects to study the structure and evolution of our Galaxy. For instance, the initial-final mass relationship, which connects the final mass of a white dwarf with the initial mass of its main-sequence progenitor, is of paramount importance for different aspects in modern astrophysics. This function is used for determining the ages of globular clusters and their distances, for studying the chemical evolution of galaxies, and also to understand the properties of the Galactic population of white dwarfs. Despite its relevance, this relationship is still relatively poorly constrained.
The main aim of this thesis is the study of the initial-final mass relationship. For such purpose we have used two different approaches. From an observational perspective, the statistical significance of the current initial final mass relationship can be improved by performing spectroscopic observations of white dwarfs for which some important parameters are available. Since this approach involves the use of theoretical stellar evolutionary tracks the resulting initial-final mass relationship is, in fact, semi-empirical. In this thesis we present a promising method which consists in using common proper motion pairs comprised of a white dwarf and a FGK star. It is sound to assume that the members of the system were born simultaneously and with the same chemical composition. Moreover, these stars are well separated and it can be considered that they have evolved as isolated stars, since mass exchange between them is unlikely. Thus, a careful analysis of the observational data of both members of each pair allows us to derive the initial and final masses of the white dwarf components, something which is totally impossible when white dwarfs are isolated. Considering the new data that we have obtained with this work and the observational data currently used to define the initial-final mass relationship we have carried out a revision of this relationship, giving some clues on its dependence on different parameters, especially on metallicity.
The second approach to improve the initial-final mass relationship involves an indirect measurement, which has been carried out by studying its influence on one of the powerful tools related to the white dwarf population, the white dwarf luminosity function. We have computed a series of luminosity functions using different theoretical initial-final mass relationships, and also, considering the semi-empirical relation derived in this thesis. We have compared these computations with the available observational data in order to evaluate the validity of each of these relations.
In order to increase the statistical significance of the white dwarf luminosity function and to improve the initial-final mass relationship it is necessary to extend the amount of accurate and reliable observational data. For this reason part of the thesis is devoted to the Alhambra Survey, which is a good example of the new deep surveys currently under development. These observational projects will detect thousands of new white dwarfs, some of them belonging to common proper motion pairs, which could be eventually used to extend our analysis. Thus, we have performed an exhaustive study to optimize the identification procedure of the white dwarf candidates which will be eventually detected by the Alhambra survey.
Lee, Yueh-Ning. "Formation and fragmentation of stellar proto-clusters." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC152/document.
Full textStars are building blocks of the Universe. They emit energy in form of light and make the material in the night sky visible. They are the elementary constituents of galaxies, determining their evolution and dynamics. On the other hand, stars are the hosts o planetary systems. The debris disc around a new-born star eventually cools down and form planets. The characteristic of the planetary system, essentially the mass of the central star, plays a major role in the formation of living being on planets. The formation of stars often occur in a clusters manner, and one of the important issues constantly under debate is the distribution of the mass of newly-born stars. This thesis is aimed to understand the Initial Mass Function which seems to be universal among different environments.This manuscripts comprises two introductory chapters on the physics of star formation and the numerical methods, respectively. Three following chapters present the projets carried out during the thesis: formation of proto-clusters, effects of initial condition in the molecular cloud, and the formation of prestellar cores from filament fragmentation, all followed by published journal articles. The last chapter concludes the manuscript and discuss the perspectives
Canameras, R., N. P. H. Nesvadba, R. Kneissl, M. Limousin, R. Gavazzi, D. Scott, H. Dole, et al. "Planck's dusty GEMS III. A massive lensing galaxy with a bottom-heavy stellar initial mass function at z=1.5." EDP SCIENCES S A, 2017. http://hdl.handle.net/10150/624365.
Full textOrsi, Maia. "Population synthesis models for IMF studies." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4525/.
Full textMor, Crespo Roger. "The star formation history and the stellar initial mass function of the Milky Way disc. The population synthesis Besançon Galaxy Model in the Gaia era." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667482.
Full textPrichard, Laura Jane. "The evolution of early-type galaxies." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:35fbf5c7-76de-4179-8e68-032ba8b5f3ee.
Full textBurgess, Andrew. "Exploration de la fonction de faible masse initiale dans les amas jeunes et les r ´egions de formation stellaire." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00576460.
Full textWilliams, R. P. "Low surface brightness galaxies and the galaxy stellar mass function." Thesis, Liverpool John Moores University, 2017. http://researchonline.ljmu.ac.uk/6652/.
Full textLuhman, Kevin Lee 1971. "Low-mass star formation and the initial mass function in young clusters." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/288884.
Full textSimon, Jacob B., Philip J. Armitage, Andrew N. Youdin, and Rixin Li. "Evidence for Universality in the Initial Planetesimal Mass Function." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626045.
Full textTinker, Jeremy L., Joel R. Brownstein, Hong Guo, Alexie Leauthaud, Claudia Maraston, Karen Masters, Antonio D. Montero-Dorta, et al. "The Correlation between Halo Mass and Stellar Mass for the Most Massive Galaxies in the Universe." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624043.
Full textThompson, Simon. "Low mass stars, brown dwarfs and the initial mass function in Cepheus OB3b." Thesis, Keele University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288434.
Full textAshworth, Greg. "Exploring the initial mass function by stochastically lighting up galaxies." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12739/.
Full textBressert, Eli Walter. "The initial distribution of stars." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3890.
Full textBurke, Christopher J. "Survey for transiting extrasolar planets in stellar systems stellar and planetary content of the Open Cluster NGC 1245 /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132168623.
Full textCovey, Kevin R. "Dynamical properties of embedded protostars and the luminosity function of the galactic disk /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5448.
Full textSelman, Fernando Javier Scoville Nicholas Zabriskie. "The initial mass function and star-formation history in the 30 Doradus super-association /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05122004-130955.
Full textMatteuzzi, Massimiliano. "The size and stellar mass evolution of satellite ETGs in the most massive clusters." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/22218/.
Full textVignola, Matteo. "Constraining the initial mass function of the giant early-type galaxies NGC 1332 and NGC 7619." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15597/.
Full textAchitouv, Ixandra. "Halo mass function of dark matter halos : imprints of the initial matter density field and of the non-linear collapse." Paris 7, 2012. http://www.theses.fr/2012PA077245.
Full textDrass, Holger [Verfasser], Rolf [Gutachter] Chini, and Susanne [Gutachter] Hüttemeister. "The substellar initial mass function of the Orion Nebula cluster / Holger Drass ; Gutachter: Rolf Chini, Susanne Hüttemeister ; Fakultät für Physik und Astronomie." Bochum : Ruhr-Universität Bochum, 2014. http://d-nb.info/1207543152/34.
Full textFaimali, Alessandro Daniele. "The history and rate of star formation within the G305 complex." Thesis, University of Hertfordshire, 2013. http://hdl.handle.net/2299/13732.
Full textJones, Michael Oliver. "The role of protostellar heating in star formation." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34560.
Full textLyo, A.-Ran Physical Environmental & Mathematical Sciences Australian Defence Force Academy UNSW. "The nearby young [special character] Chamaeleontis cluster as a laboratory for star formation and evolution." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Physical, Environmental and Mathematical Sciences, 2004. http://handle.unsw.edu.au/1959.4/38707.
Full textMiret, Roig Núria. "COSMIC-DANCE : A comprehensive census of nearby star forming regions." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0327.
Full textUnderstanding how stars form is one of the fundamental questions which astronomy aims to answer. Currently, it is well accepted that the majority of stars form in groups and that their predominant mechanism of formation is the core-collapse. However, several mechanisms have been suggested to explain the formation of substellar objects, and their contribution is still under debate. The main goal of this thesis is to determine the initial mass function, the mass distribution of stars at birth time, in different associations and star-forming regions. The mass function constitutes a fundamental observational parameter to constrain stellar and substellar formation theories since different formation mechanisms predict different fraction of stellar and substellar objects. We used the Gaia Data Release 2 catalogue together with ground-based observations from the COSMIC-DANCe project to look for high probability members via a probabilistic model of the distribution of the observable quantities in both the cluster and background populations. We applied this method to the 30 Myr open cluster IC 4665 and the 1 - 10 Myr star-forming region Upper Scorpius (USC) and r Ophiuchi (r Oph). We found very rich populations of substellar objects which largely exceed the numbers predicted by core-collapse models. In USC, where our sensitivity is best, we found a large number of free-floating planets and we suggest that ejection from planetary systems must have a similar contribution than core-collapse in their formation. The age is a fundamental parameter to study the formation and evolution of stars and is essential to accurately convert luminosities to masses. For that, we also presented a strategy to study the dynamical traceback age of young local associations through an orbital traceback analysis. We applied this method to determine the age of the b Pictoris moving group and in the future, we plan to apply it to other regions such as USC. The members we identified with the membership analysis are excellent targets for follow-up studies such as a search for discs, exoplanets, characterisation of brown dwarfs and free-floating planets. I this thesis, we presented a search for discs hosted by members of IC 4665 and we found six excellent candidates to be imaged with ALMA or the JWST. The tools we developed, are ready to be used in other regions such as USC and r Oph, where we expect to find a larger number of disc-host stars
Moutard, Thibaud. "Redshifts photométriques et paramètres physiques des galaxies dans les sondages à grande échelle : contraintes sur l'évolution des galaxies massives." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4782.
Full textThis thesis presents the measurement of the photometric redshifts and physical parameters in the framework of large scale surveys, and their constraint on galaxy evolution. The photometric redshift measurement allows us to study the entire photometric sample. For this reason, the weak lensing signal measurement used in the Euclid mission as a primary cosmological probe will rely on photometric redshift measurements. However, the method is strongly affected by the quality of the photometry. In particular, I show in this thesis how the photometric calibration impacts the photometric redshift precison, in order to constrain the photometric strategy to use in the Euclid mission.Aiming to take into account for observationnal problems, the analysis is done with observationnal data whose photometric configuration is close to the expected Euclid one. These data combine new near-infrared observations conduected to cover the VIPERS spectroscopic survey and the CFHTLS photometry.Using the conclusions of this analysis, I have producted the new photometric catalogue for VIPERS and the associated photometric redshift calalogue.Finally, I used the same photometry to compute the stellar masses of 760,000 galaxies covering 22 square degrees at the limiting magnitude Ks(AB) < 22. This enabled me to study the evolution of the stellar mass function between redshifts z= 0.2 and z = 1.5. We have then shown that the star formation of galaxies with stellar masses around log(M/Msol) = 10.66 is stopped in 2-4 Gyr, while in quiescent low-mass (log(M/Msol) < 9.5) galaxies, the star formation has been stopped 5-10 times faster (approximatelly in 0.4 Gyr)
Selman, Fernando Javier. "The Initial Mass Function and Star-Formation History in the 30 Doradus Super-Association." Thesis, 2004. https://thesis.library.caltech.edu/1748/2/fselman_phdthesis.pdf.
Full textSadavoy, Sarah I. "The mass distribution of protostellar and starless cores in Gould Belt clouds." Thesis, 2009. http://hdl.handle.net/1828/1611.
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