Optical Spectroscopy of V4334 Sgr in 1996

Autor(en)

Igor Savanov, Denis Victorovich Shulyak

Abstrakt

akurai's object (V4334 Sgr) was discovered as a rapidly brightening blue star in February 1996. As it brightened, it became increasingly red, until after two years it was enshrouded by an opaque dust shell. This event has been identified with a very late thermal pulse (the re-ignition of shell helium burning) in a white dwarf.

 

We are compiling a library of optical spectra obtained during 1996 in order to (a) ensure that the observed record of this extremely rare phenomenon remains accessible to future researchers and (b) to re-visit the question of its early evolution. This is particularly important for understanding the precise timing and magnitude of the dredge-up of material to the surface of the star following a late thermal pulse. We present preliminary results of a new analysis of some of these data. These include possibly the first direct evidence of dynamical behavior in the expanding stellar envelope.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Crimean Astrophysical Observatory

Seiten

159

Publikationsdatum

2008

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/aa078391-de97-4f02-af55-287a2cc33bfe