Photospheric Ca and Mg line-strength variations in G29-38

Details Photospheric Ca and Mg line-strength variations in G29-38 Photospheric Ca and Mg line-strength variations in G29-38

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.172a2059v&link_type=abstract

Journal of Physics: Conference Series, Volume 172, Issue 1, pp. 012059 (2009).

Physics

Scientific paper

Temporal variations in metal-line strengths in H-atmosphere white dwarfs hold the potential to test the timescales of graviational settling theory. These short timescales, in turn, require that DAZs are currently accreting. Such temporal variations would also indicate that accretion from a circumstellar dust disk can be episodic. We are compiling increasing evidence for time-variable Ca and Mg line-strength variations in the best studied DAZ, G29-38. Our evidence to date supports the gravitational settling timescales of Koester & Wilken (2006) and episodic accretion from G29-38's debris disk. Furthermore, we have detected evidence for time-variable accretion with a timescale = 24 hours, and typical variability of ~4% during the 100 days of our autumn 2007 monitoring campaign.

Affiliated with

Also associated with

No associations

Rating

Photospheric Ca and Mg line-strength variations in G29-38 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 Photospheric Ca and Mg line-strength variations in G29-38, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photospheric Ca and Mg line-strength variations in G29-38 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1631200