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Title:
Beta Pictoris: the variable CaII H & K absorptions from 1994 to 1996
Authors:
Petterson, Orlon K. L.; Tobin, William
Affiliation:
AA(Mount John University Observatory and Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand), AB(Mount John University Observatory and Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 4, pp. 733-742. (MNRAS Homepage)
Publication Date:
04/1999
Origin:
MNRAS
MNRAS Keywords:
LINE: PROFILES, CIRCUMSTELLAR MATTER, STARS: INDIVIDUAL: BETA PIC
DOI:
10.1046/j.1365-8711.1999.02262.x
Bibliographic Code:
1999MNRAS.304..733P

Abstract

We present high-resolution spectroscopy of the variable Ca II H & K absorptions in the star beta Pictoris. 313 spectra were obtained on 53 nights between 1994 November and 1996 December in order to characterize the behaviour of the lines and to test the falling evaporating bodies (FEB) scenario. Near-continuous absorption activity was seen, including blueshifted features, one of which rivalled the strength of that reported in 1997 June by Crawford, Beust & Lagrange. Redshifted features at ~ 5-20 km s^-1 were present until the end of 1995, and are evocative of a year-long stream of infalling bodies with typically 4-5 objects in the line of sight. At higher velocities, features were shorter lived and generally broader and shallower. These correlations also apply to blueshifted features. On 1995 June 9 we detected a probable narrow, short-lived feature at a redshift of ~ 130 km s^-1. The FEB models predict that the strength of the H line may exceed the K line value as a body tracks across the stellar disc, but we have no convincing observation of this, although we did observe some events during which the H & K absorptions evolved differently.

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