Stellar activity in exoplanet hosts Enrique Herrero Casas
... Most of the efforts on the search and characterization of Earth-like exoplanets are currently focused on low mass stars. These represent the vast majority of the population in our galaxy (about 75% of the stars have a lower mass than the Sun) and their interest lies in the fact that the photometric a ...
... Most of the efforts on the search and characterization of Earth-like exoplanets are currently focused on low mass stars. These represent the vast majority of the population in our galaxy (about 75% of the stars have a lower mass than the Sun) and their interest lies in the fact that the photometric a ...
Spiral Density Waves in a Young Protoplanetary
... on the driving mechanism and the disk physical properties (1,3-5). Theoretical predictions agree that these spiral features can be very prominent and thus more easily observable than the putative embedded planets or instabilities driving such waves (6,7). Spiral-like patterns have been observed in e ...
... on the driving mechanism and the disk physical properties (1,3-5). Theoretical predictions agree that these spiral features can be very prominent and thus more easily observable than the putative embedded planets or instabilities driving such waves (6,7). Spiral-like patterns have been observed in e ...
The magnetic field and wind confinement of b Cephei: new clues for
... literature for b Cep. We must therefore estimate these parameters based on measurements of normal non-supergiant B stars of similar spectral type, using for instance the survey of Prinja (1989). We first obtain that b Cep should have a terminal velocity of the order of the escape velocity (equal to ...
... literature for b Cep. We must therefore estimate these parameters based on measurements of normal non-supergiant B stars of similar spectral type, using for instance the survey of Prinja (1989). We first obtain that b Cep should have a terminal velocity of the order of the escape velocity (equal to ...
Kidd_Thesis_2015April15_Final.
... be observing hundreds of thousands of transient events every night [11]. Transients can be defined as “all genuine non-moving objects that brighten by a certain amount” [15]. The Gaia mission and the Large Synoptic Sky Survey will be collecting over a billion periodic variables [6, 7]. But in order ...
... be observing hundreds of thousands of transient events every night [11]. Transients can be defined as “all genuine non-moving objects that brighten by a certain amount” [15]. The Gaia mission and the Large Synoptic Sky Survey will be collecting over a billion periodic variables [6, 7]. But in order ...
Kidd_Thesis_2015April14_Final.
... be observing hundreds of thousands of transient events every night [11]. Transients can be defined as “all genuine non-moving objects that brighten by a certain amount” [15]. The Gaia mission and the Large Synoptic Sky Survey will be collecting over a billion periodic variables [6, 7]. But in order ...
... be observing hundreds of thousands of transient events every night [11]. Transients can be defined as “all genuine non-moving objects that brighten by a certain amount” [15]. The Gaia mission and the Large Synoptic Sky Survey will be collecting over a billion periodic variables [6, 7]. But in order ...
Spectropolarimetry of the massive post
... mostly probed in the red, they do not trace high stellar temperatures sensitively. And so, it is not obvious whether the star has halted its increase in temperature or not. For HD 179821 we find no polarization effects across any absorption or emission lines, but observe very large polarization chan ...
... mostly probed in the red, they do not trace high stellar temperatures sensitively. And so, it is not obvious whether the star has halted its increase in temperature or not. For HD 179821 we find no polarization effects across any absorption or emission lines, but observe very large polarization chan ...
Objective Classification of Galaxy Spectra using the Information Bottleneck Method
... physical and observable galaxy properties that are intuitively familiar to astronomers. For example, important properties in determining the spectral characteristics of a galaxy are its mean stellar age and metallicity, or more generally its full star formation history. This is in turn presumably co ...
... physical and observable galaxy properties that are intuitively familiar to astronomers. For example, important properties in determining the spectral characteristics of a galaxy are its mean stellar age and metallicity, or more generally its full star formation history. This is in turn presumably co ...
Introduction astronomy
... Gustav Kirchhoff & Robert Bunsen (1860/1861) Chemische Analyse durch Spectralbeobachtungen “In a memoir published by one of us (Kirchhoff 1859), it was proved from theoretical considerations that the spectrum of an incandescent gas becomes reversed (that is, the bright lines become changed into dark ...
... Gustav Kirchhoff & Robert Bunsen (1860/1861) Chemische Analyse durch Spectralbeobachtungen “In a memoir published by one of us (Kirchhoff 1859), it was proved from theoretical considerations that the spectrum of an incandescent gas becomes reversed (that is, the bright lines become changed into dark ...
Presolar History Recorded in Extraterrestrial Materials
... measured for the first time. With a new perspective from modern physics, it was shown that stars live, evolve, and Red giant (RG) and asymptotic giant branch (AGB) die according to nuclear reactions in their deep interiors stars – Red giant stars have exhausted all the hydrogen (Burbidge et al. 1957 ...
... measured for the first time. With a new perspective from modern physics, it was shown that stars live, evolve, and Red giant (RG) and asymptotic giant branch (AGB) die according to nuclear reactions in their deep interiors stars – Red giant stars have exhausted all the hydrogen (Burbidge et al. 1957 ...
TMT Science Overview - GSMT Program Office
... using adaptive optics and study their interaction with the ISM in galactic starforming regions. – Investigate feedback from protostars to the molecular cloud. – Study many Herbig Haro objects at a time using deployable IFUs. – Will compliment submm observations with ALMA. TMT.PSC.PRE.06.032.REL01 ...
... using adaptive optics and study their interaction with the ISM in galactic starforming regions. – Investigate feedback from protostars to the molecular cloud. – Study many Herbig Haro objects at a time using deployable IFUs. – Will compliment submm observations with ALMA. TMT.PSC.PRE.06.032.REL01 ...
Neutron Stars in Compact Binary Systems: From the equation of
... We begin with the death of a star. When the star is young, although the gravity of the star pulls matter inward, the nuclear fusion reactions radiate energy outward, supplying enough pressure to keep the star at the size we see. Eventually, however, the raw materials in the core are used up. The fus ...
... We begin with the death of a star. When the star is young, although the gravity of the star pulls matter inward, the nuclear fusion reactions radiate energy outward, supplying enough pressure to keep the star at the size we see. Eventually, however, the raw materials in the core are used up. The fus ...
Lecture Notes and Essays in Astrophysics VOLUME III
... Planetology, Solar and Stellar Physics, Extragalactic Astronomy, Cosmology and astronomical instrumentation. After decades without a dedicated mission, Venus is again in fashion. On the one hand, Ricardo Hueso and collaborators, and on the other Miguel Ángel López-Valverde, review ESA Venus Expres ...
... Planetology, Solar and Stellar Physics, Extragalactic Astronomy, Cosmology and astronomical instrumentation. After decades without a dedicated mission, Venus is again in fashion. On the one hand, Ricardo Hueso and collaborators, and on the other Miguel Ángel López-Valverde, review ESA Venus Expres ...
Evolution of Stars and Stellar Populations
... range, from radio to X-ray, and are called active galaxies. These active galaxies display a large range of properties that can probably be explained invoking one single mechanism (possibly related to accretion of matter onto a black hole); the difference in their properties is most likely due to the ...
... range, from radio to X-ray, and are called active galaxies. These active galaxies display a large range of properties that can probably be explained invoking one single mechanism (possibly related to accretion of matter onto a black hole); the difference in their properties is most likely due to the ...
Chapter 20 Notes
... • Quasars may be infant galaxies. • In 1960, a faint object was matched with a strong radio signal. This object was called a quasar. ...
... • Quasars may be infant galaxies. • In 1960, a faint object was matched with a strong radio signal. This object was called a quasar. ...
ACCELERATION DUE TO GRAVITY OF A RAPIDLY ROTATING
... The explosion will result in a supernova type II event where most of the original star mass will be blown away and the dense solid core will remain. The collapse will continue even to high density than that associated with a white dwarf. The neutrons will produce a degeneracy pressure that will stop ...
... The explosion will result in a supernova type II event where most of the original star mass will be blown away and the dense solid core will remain. The collapse will continue even to high density than that associated with a white dwarf. The neutrons will produce a degeneracy pressure that will stop ...
arXiv:astro-ph/0612072v1 4 Dec 2006 Theory of core
... that ultimately triggers a supernova explosion (Fig. 1, middle left panel), but the exact mechanism of the explosion and the crucial ingredients of this physically appealing scenario are still uncertain and controversial. If the shock wave is strong enough not only to stop the collapse, but also to ...
... that ultimately triggers a supernova explosion (Fig. 1, middle left panel), but the exact mechanism of the explosion and the crucial ingredients of this physically appealing scenario are still uncertain and controversial. If the shock wave is strong enough not only to stop the collapse, but also to ...
dust mass
... 〇 Formation of massive carbon dust - high sticking probability of α = 0.1-1 ➔ if α < ~0.01, any dust grain cannot condense - dust formation around 100 days, M(56Ni) ~ 0.6 Msun ➔ dust formation can be destroyed by energetic photons and electrons prevailing in the ejecta - massive unburned carbon (~0. ...
... 〇 Formation of massive carbon dust - high sticking probability of α = 0.1-1 ➔ if α < ~0.01, any dust grain cannot condense - dust formation around 100 days, M(56Ni) ~ 0.6 Msun ➔ dust formation can be destroyed by energetic photons and electrons prevailing in the ejecta - massive unburned carbon (~0. ...
LOCALIZATION AND OBSERVATIONS OF GRB010921 BY THE …
... if progenitor is a massive star with rapid rotation escape route along the rotation axis jet formation alleviate energy requirements higher burst rates ...
... if progenitor is a massive star with rapid rotation escape route along the rotation axis jet formation alleviate energy requirements higher burst rates ...
Ferraro et al. 2006
... • Given its high luminosity (Mv=-9.4) and and half-mass radius (rh=25pc; Bellazzini 2007) NGC2419 lies (together with OmegaCen) Ripepi et al. 2007 in the (rh, MV )plane well above the locus defined by all the other Galactic GCs thus suggesting it might be the stripped core of a former dwarf galaxy ( ...
... • Given its high luminosity (Mv=-9.4) and and half-mass radius (rh=25pc; Bellazzini 2007) NGC2419 lies (together with OmegaCen) Ripepi et al. 2007 in the (rh, MV )plane well above the locus defined by all the other Galactic GCs thus suggesting it might be the stripped core of a former dwarf galaxy ( ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.