Variability and evolution in various classes of post-AGB stars

ŞAHİN T., Jeffery C. S.

ASTRONOMISCHE NACHRICHTEN, cilt.328, sa.8, ss.848-851, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 328 Sayı: 8
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1002/asna.200710808
  • Dergi Adı: ASTRONOMISCHE NACHRICHTEN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.848-851
  • Anahtar Kelimeler: stars : early-type, stars : super-giants, post-AGB stars, EXTREME HELIUM STAR, RADIAL PULSATION, WHITE-DWARFS, DEFICIENT, BINARY, SPECTRA
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

We aim to compare properties of early-type post-asymptotic giant-branch (post-AGB) stars, including normal first-time B-type post-AGB stars, and extreme helium stars (EHes). Hipparcos photometry for 12 post-AGB stars and 7 EHe stars has been analyzed; 5 post-AGB stars are clearly variable. The Hipparcos data are not sufficiently sensitive to detect variability in any of the EHes.

We aim to compare properties of early-type post-asymptotic giant-branch (post-AGB) stars, including normal first-time B-type post-AGB stars, and extreme helium stars (EHes). Hipparcos photometry for 12 post-AGB stars and 7 EHe stars has been analyzed; 5 post-AGB stars are clearly variable. The Hipparcos data are not sufficiently sensitive to detect variability in any of the EHes.