The Search For Post-AGB Stars With Dusty Discs

Details The Search For Post-AGB Stars With Dusty Discs The Search For Post-AGB Stars With Dusty Discs

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..14l&link_type=abstract

Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech

Astronomy and Astrophysics

Astronomy

Scientific paper

Introduction. A systematic search has been made for stars of a subset of the presumed post-AGB population, which are characterised by their RV Tauri-like spectral energy distributions in the 1-60 micron range as well as by near-solar spectral types. Data from several large surveys have been combined to find such stars, which include classical RV Tauri stars, stars which lie outside the Type II Cepheid instability strip and have at most small-amplitude pulsations, and stars such as S Equ, which have superimposed absorption features which arise in cool circumstellar gas. All are thought to have dusty circumstellar discs. Methods. Four main searches have been carried out. 1. Stars which have RV Tauri-like colours in the IRAS [12]-[25], [25]-[60] diagram were observed spectroscopically and by JHKL photometry. 2. JHK data from the 2MASS catalogue were combined with IRAS photometry to select stars with red [12]-[25], an excess at K and a large K-[12] value, reproducing the photometric characteristics of the stars selected earlier except for the lack of L and 60 micron measurements. 3. A comparison of 2MASS with stars which the General Catalogue of Variable Stars classified as RV?, SR, SRd or Cep. 4. Stars with small amplitudes of variation were checked in ROSAT. Results. Surveys 1 and 3 identified a substantial number of new RV Tauri stars, as well as F stars, which have smaller amplitudes of pulsation. M stars with excesses at L and hot emission line stars were also found by survey 1. Survey 2 excluded M stars and found several stars with emission lines suggesting edge-on discs. Survey 4 allowed a number of supposed SRd stars to be reclassified as chromospherically-active stars. Discussion. These surveys have identified a substantial number of stars, of all effective temperatures, which have dusty discs. They extend the previously-known range of properties of such stars.

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