Morphology, Dynamics and Physical Properties of the Nebula around HD168625

Details Morphology, Dynamics and Physical Properties of the Nebula around HD168625 Morphology, Dynamics and Physical Properties of the Nebula around HD168625

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.3803p&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #38.03; Bulletin of the American Astronomical Society, Vol. 28, p.881

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new, medium resolution spectra and high resolution coronographic images of the nebula around HD168625, taken in June 1994, May and October 1995. We find that the nebula has a complex morphology, which includes an inner elliptical shell (12'' x 16'' in size) and fainter filaments forming two outer loops in the northern and southern regions, suggesting an overall bipolar structure. The nebular dynamics show a shell expanding at ~ 40 km/s, centered on the star, and the detected N enrichment suggests that the nebula is formed by ejected stellar material. We determine a nebular mass of 0.5 Msun, an upper limit in T_e of 7,000 K and an averaged N_e of 1500 cm(-3) , which are fairly typical of nebulae around LBVs. We also find that between May and October 1995, HD168625 dimmed by ~ 0.3 mag and its temperature diminished from 15,000 K to 12,000 K. We conclude that, although HD168625 has not displayed LBV type variations in the past few decades, it has undergone a LBV type outburst ~ 10(3) yrs ago. The morphology of its surrounding nebula suggests a wind, interacting with a density contrast as shaping mechanism.

Affiliated with

Also associated with

No associations

Rating

Morphology, Dynamics and Physical Properties of the Nebula around HD168625 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 Morphology, Dynamics and Physical Properties of the Nebula around HD168625, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Morphology, Dynamics and Physical Properties of the Nebula around HD168625 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1353581