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Author: Cecilia Payne-Gaposchkin
Publisher:
ISBN:
Category : Milky Way
Languages : en
Pages : 394
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Book Description
Author: Cecilia Payne-Gaposchkin
Publisher:
ISBN:
Category : Milky Way
Languages : en
Pages : 394
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Book Description
Author: Hilmar W. Duerbeck
Publisher: Springer Science & Business Media
ISBN: 9401705968
Category : Science
Languages : en
Pages : 216
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Book Description
4. Census of the Catalogue The catalogue contains information on 277 objects. 137 (50%) of them are stars whose outburst spectra or unambiguous mInImUm characteristics classify them as novae beyond doubt. 123 of them could be identified at minimum. 78 (28 %) are stars with amplitudes and light curve forms which makes nova classifi cation likely. 60 of them could be identified at minimum. Thus, 78 % ofthe objects in this catalogue are confirmed and suspected classical novae. 16 (6%) have properties compatible with both novae and related objects. 15 are identified at minimum. Furthermore, the catalogue and atlas contains data on 12 (4 %) dwarf novae of long cycle length or suspected dwarf novae for which only one outburst has been observed. Examples are WZ Sge and CI Gern. 6 (2%) recurrent novae or suspected recurrent novae are listed. Examples are T CrB and AS Psc. 6 (2%) X-ray novae are listed. Examples are V616 Mon and KY TrA. 6 (2%) symbiotic stars and symbiotic novae are listed. Examples are RT Ser and V352 Aql. 11 (4 %) Mira stars or suspected Mira stars, which at some time were believed to be novae, are listed. Examples are V607 Aql and V927 Sgr.
Author: C. Payne-gaposchkin
Publisher:
ISBN:
Category :
Languages : it
Pages : 0
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Author: Cecilia Payne-Gaposchkin
Publisher:
ISBN:
Category :
Languages : nl
Pages : 336
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Book Description
![The Galactic Novae. [With Plates.]. PDF](https://books.google.com/books/content/images/frontcover/2uFjtAEACAAJ?fife=w80-h100)
Author: afterwards GAPOSCHKIN PAYNE (Cecilia Helena)
Publisher:
ISBN:
Category :
Languages : en
Pages : 336
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Author: Karl Gordon Henize
Publisher:
ISBN:
Category : Stars
Languages : en
Pages : 96
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Author: M. F. Bode
Publisher:
ISBN: 9781107175242
Category : Cataclysmic variable stars
Languages : en
Pages : 375
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Book Description
Fully updated and revised second edition reference on classical novae for researchers and graduate students.
Author: Adam Kawash
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 0
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Book Description
There is a significant discrepancy between recent predictions of the Milky Way classical nova rate of 8́ơ 60 per year and the annual discovery rate of 8́ơ 10. Why the recovery fraction of these events is 8́ơ 15% even with large advancements to observational time domain astronomy remains largely unexplained. Because of the location of Earth within the Galaxy, discovering Galactic transients requires a large field of view. For the past few decades, observations from a network of amateur astronomers were largely responsible for discovering classical novae, so the sky-coverage as a function of position and depth was difficult to model. Fortunately, in the past decade, many time domain surveys with fields of view that cover large areas of the sky have been commissioned, making the sky-coverage more well defined. To date, there are no Galactic nova rate predictions made using data from a time domain survey that is capable of observing the entire sky. In this thesis, the first estimate of the Galactic nova rate using observations from two all-sky surveys is made.The All-Sky Automated Survey for Supernovae (ASAS-SN) is the first survey to systematically observe the entire sky every night, providing unprecedented cadence of the sky for transients and variable stars. The space-based survey Gaia has a broad observing filter and a fine (8́ơ 0.1 arcsecond) pixel scale, so it is capable of detecting Galactic plane transients in crowded fields that are heavily affected by extinction. These are the only two all-sky surveys to report classical nova candidates, and they have contributed to marginally increasing the discovery rate of Galactic novae to 13 per year on average since 2017. In addition to the increase in discoveries, this thesis exploits the systematic observing patterns to estimate what fraction of the Galaxy's novae these surveys detect. To make this estimate, I have constructed a statistical model of Galactic classical novae by utilizing the recently published models of stellar density and extinction of the Milky Way. Using ASAS-SN photometry, I measure the outburst amplitude of novae to be normally distributed with mean and standard deviation Îơ = 11.43 ℗ł 0.25 mag and Ï3 = 2.57 ℗ł 0.20 mag, respectively. By using recently available all-sky 3D dust maps, I estimate that 8́ơ 50% of Galactic novae are hidden by extinction from being detected by ASAS-SN. Finally, I estimate that the recovery fraction of the global population of Galactic novae for ASAS-SN 9́8 33%, Gaia 9́8 42%, and a joint effort of the two surveys 9́8 54%, predicting that the Galactic nova rate is 26 ℗ł 5 yr8́21, significantly lower than recent estimates.
Author: Michael F. Bode
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 368
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Book Description
A comprehensive, up-to-date description of the properties and mechanisms of classical novae--and the first such effort in the subject since Payne-Gaposchkin's influential (but out of date) The Galactic Novae. Contributors present a balanced mix of observation and theory, and discuss information gathered at optical, radio, infrared, ultraviolet, and x-ray wavelengths. Discussion begins with an overview of the general properties of novae, then covers the accretion process in nova systems and the physics of the nova outburst. Classical novae are then placed in the broader family of cataclysmic variables. Final chapter is devoted to data on novae, including an atlas.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The ultraviolet studies of galactic novae both in outburst and also in quiescence have provided new and fundamental data on these exploding stars. As a direct result of the IUE spectral studies, we have identified a new class of novae in which the outburst occurs on an ONeMg white dwarf. We have also been able to determine ejected masses, elemental abundances, and ultraviolet light curves for a wide variety of nova outbursts. 70 refs.
