Код товара: 31834321
Classical Cepheids as tracers of the disk abundance gradient #1

Classical Cepheids as tracers of the disk abundance gradient

Тип книги:
Издательство
LAP Lambert Academic Publishing
Год выпуска
2014
Тип книги
Книга на иностранном языке
Автор на обложке
Silvia Pedicelli
Количество страниц
184
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О книге

Classical Cepheids are the most popular primary distance indicator. They obey to well defined optical and near-infrared (NIR) Period-Luminosity (PL) relations and their distances can be estimated with
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Описание

Classical Cepheids are the most popular primary distance indicator. They obey to well defined optical and near-infrared (NIR) Period-Luminosity (PL) relations and their distances can be estimated with an accuracy of a few percent. They also are, the best tracers of intermediate-mass stars. In particular, since they are distributed across the Galactic disk they can be adopted to trace the iron and heavy element radial gradients. In the past few years, significant progress has been made to understand and characterize the influence that chemical composition may have on the Cepheids Period-Luminosity relation but this issue is still unsettled. Although the existence of the Galactic abundance gradient is now widely accepted, its value still need to be established. To better understand these fundamental points, we focused our attenction on two main topics: i) the influence of the stellar iron content on the PL relation in the V and in the K band. ii) the behavior of the Galactic iron gradient between 5 and 17 kpc, using homogeneous iron abundances for 270 Galactic Cepheids located across the disk together with accurate distance determinations.

Комментарий

Classical Cepheids are something more then distance indicators

Характеристики

Издательство
LAP Lambert Academic Publishing
Год выпуска
2014
Тип книги
Книга на иностранном языке
Автор на обложке
Silvia Pedicelli
Количество страниц
184
Язык издания
Английский
ISBN
9783659534751
Вес в упаковке, г
501
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Издательства

  • LAP Lambert Academic Publishing Издательство