Th4-4: A Be star which has turned into a planetary nebula within 30 years

Details Th4-4: A Be star which has turned into a planetary nebula within 30 years Th4-4: A Be star which has turned into a planetary nebula within 30 years

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..978k&link_type=abstract

Astronomy and Astrophysics, v.376, p.978-981 (2001)

Astronomy and Astrophysics

Astrophysics

2

Planetary Nebulae: General: Early Type Stars, Stars: Emission Lines, Be Stars: Individual: Th4-4, Stars: Evolution

Scientific paper

The first optical spectra of Th4-4, obtained by the author in 1970, showed strong continuum and broad HI emission lines. In other words, at this time the object looked like a Be star. Some years later, [OIII] emission lines appeared in the spectrum indicating the existence of a gaseous envelope. Today the optical spectrum of Th4-4 is quite similar to that of a moderate excitation planetary nebula. The magnitude of the object has dropped from V=14fm 4 to 16fm 6, and the effective temperature of the central star has increased from 22 000 K up to 40 000 K within the last 30 years.

Affiliated with

Also associated with

No associations

Rating

Th4-4: A Be star which has turned into a planetary nebula within 30 years does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Th4-4: A Be star which has turned into a planetary nebula within 30 years, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Th4-4: A Be star which has turned into a planetary nebula within 30 years will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1483768