The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines

Details The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..637l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 637-653.

Astronomy and Astrophysics

Astrophysics

48

Line Spectra, Metallicity, Stellar Envelopes, Stellar Evolution, Variable Stars, Calcium, Fourier Analysis, Protoplanets

Scientific paper

Over 200 Ca II K and H spectra of Beta Pictoris taken between September 19, 1989 and December 19, 1990 are presented. Many new variable features are observed, at low and high redshifts, together with a few blueshifted ones. The time scales for the variations are shown to be strongly dependent on the redshift of the variable lines. A rate of events of about 200/yr is derived; it is also shown that in some cases the absorbing cloud covers less than 40 percent of the stellar surface. The observed variations are analyzed and compared to those observed in the UV. These observations make it possible to test the present scenario of evaporating infalling bodies, in terms of velocity of variable lines, occurrence of variable events, small time-scale variations, and size of the absorbing cloud. It is shown that the observed velocity range for the variable components may be explained by the present scenario, as well as the size of the absorbing clouds.

Affiliated with

Also associated with

No associations

Rating

The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines 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 The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Beta Pictoris circumstellar disk. XIII - Survey of the variable CA II lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1868635