Improving the distances of post-AGB objects in the Milky Way

Shane B. Vickers, David J. Frew, Matt S. Owers, Quentin A. Parker, Ivan S. Bojičič

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Abstract

Post-AGB (PAGB) stars are short-lived, low-intermediate mass objects transitioning from the asymptotic giant branch (AGB) to the white dwarf (WD) phase. These objects are characterised by a constant, core-mass dependent luminosity and a large infrared excess from the dusty envelope ejected at the top of the AGB. PAGB stars provide insights into the evolution of their direct descendants, planetary nebulae (PNe). Calculation of physical characteristics of PAGB are dependent on accurately determined distances scarcely available in the literature. Using the Torun catalogue for PAGB objects, supplemented with archival data, we have determined distances to the known population of Galactic PAGB stars. This is by modelling their spectral energy distributions (SED) with black bodies and numerically integrating over the entire wavelength range to determine the total integrated object flux. For most PAGB stars we assumed their luminosities are based on their positional characteristics and stellar evolution models. RV Tauri stars however are known to follow a period-luminosity relation (PLR) reminiscent of type-2 Cepheids. For these variable PAGB stars we determined their luminosities via the PLR and hence their distances. This allows us to overcome the biggest obstacle to characterising these poorly understood objects that play a vital part in Galactic chemical enrichment.

Original languageEnglish
Article number072013
Pages (from-to)1-2
Number of pages2
JournalJournal of Physics: Conference Series
Volume728
Issue number7
DOIs
Publication statusPublished - 8 Aug 2016
Event11th Pacific Rim Conference on Stellar Astrophysics - The University of Hong Kong, Hong Kong, China
Duration: 14 Dec 201517 Dec 2015
http://www.scifac.hku.hk/event/PRCSA2015/

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