Silvia Pedicelli

Classical Cepheids as tracers of the disk abundance gradient

Classical Cepheids are something more then distance indicators

• Broschiertes Buch

Produktbeschreibung

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.

Produktdetails

• Verlag: LAP Lambert Academic Publishing
• Seitenzahl: 184
• Erscheinungstermin: 24. April 2014
• Englisch
• Abmessung: 220mm x 150mm x 12mm
• Gewicht: 261g
• ISBN-13: 9783659534751
• ISBN-10: 3659534757
• Artikelnr.: 40887081

Autorenporträt

Pedicelli Silvia was born in Rome in 1977. She graduated in Physics and earned her PhD. in Astronomy. He has worked for more than two years at ESO (European Southern Observatory) in Germany and she has published several papers (http://arxiv.org/find/all/1/au:+Pedicelli/0/1/0/all/0/1) and two science ebook: "Un bosone da Ginevra" and "Bon Voyage".