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Δ Andromedae (K3 III): A hybrid giant in an extended dust shell

Published online by Cambridge University Press:  04 August 2017

C. Jordan ,
P. G. Judge  and
M. Rowan-Robinson
C. Jordan
Affiliation:
Dept. of Theoretical Physics, Oxford University 1, Keble Road Oxford, OX1 3NP, U.K.
P. G. Judge
Affiliation:
Dept. of Theoretical Physics, Oxford University 1, Keble Road Oxford, OX1 3NP, U.K.
M. Rowan-Robinson
Affiliation:
Dept. of Mathematics Queen Mary College Mile End Road London, E1 4NS, U.K.

Abstract

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Observations made with the Infrared Astronomical Satellite (IRAS) showed the existence of a set of K stars with excess emission at 60 μ. The brightest star in the group is δ And (K3 III). Spectra of δ And have been obtained with the International Ultraviolet Explorer (IUE) in both the long and short wavelength regions. These spectra show several features unusual in a K giant as cool as δ And, in particular, emission from CIV, MgII h and k lines with blue wings stronger than the red and MgII absorption blue shifted to up to 300 km s−1. Overall δ And is similar to the known hybrid bright giant α TrA (K4 II). We have discovered the first ‘hybrid’ giant star. The IRAS observations are interpreted in terms of a cool (∼100 K) dust cloud surrounding δ And - a spectroscopic binary system- and a third component at 1200 A.U.

Type
Mass-Loss From Cool Stars
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 321 - 322
Copyright
Copyright © Reidel 1987 

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