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Detection of Narrow C IV and Si IV Absorption Features in Spectra of Stars within 200 pc of The Sun

Published online by Cambridge University Press:  12 April 2016

P. Molaro ,
J.E. Beckman ,
M. Franco ,
C. Morossi  and
M. Ramella
P. Molaro
Affiliation:
Astronomical Observatory of Trieste, Italy I.S.A.S. Miramare, Trieste, Italy
J.E. Beckman
Affiliation:
Queen Mary College, London, England
M. Franco
Affiliation:
I.A.F.E., Buenos Aires, Argentina
C. Morossi
Affiliation:
Astronomical Observatory of Trieste, Italy
M. Ramella
Affiliation:
Astronomical Observatory of Trieste, Italy

Abstract

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Detection of narrow ( δλ< 0.5 A ) absorption features in C IV at λ λ 1548 and 1550 have been made in the spectra of 4 late B dwarfs within 200 pc of the sun; the Si IV doublet at λ λ 1393 and 1403 shows up in two of them. We argue that it is difficult to account for the strengths, widths, shapes , and C IV/Si IV ratios in terms consistent with a circumstellar origin except possibly for an asymmetric C IV component in one star (HD 135037). The most probable source is “semi-torrid” gas (cf. Bruhweiler et al. 1980) in the 50,000 K range forming the interfaces between cooler H I clouds and the ambient medium at coronal temperatures. Our technique, using late B rapid rotators, is useful for LISM probing of this kind.

Type
Hot Gas in the LISM: Optical, UV, and EUV Wavelengths
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 185 - 188
Copyright
Copyright © NASA 1984

References

Bruhweiler, F.C., Kondo, Y., and McCluskey, G.I.:1980, Astrophys. J. 237, 19.Google Scholar
Bruhweiler, F.C., Kondo, Y. and McCluskey, G.E. : 1979 Astrophys.J. 229, L39.Google Scholar
Black, J.H.,Dupree, A.K. Hartmann, L.W. and Raymond, J.C. :1980, Astrophys.J. 239,502.CrossRefGoogle Scholar
Cowie, L.L.,Taylor, W., and York, D.G.:1981, Astrophys.J. 248, 528.Google Scholar
Jenkins, E.B. :1978, Astrophys. J. 219, 845.Google Scholar
Pettini, M. and West, K.A.:1982, Astrophys.J. 260,561.Google Scholar
Slettebak, A. and Carpenter, K.G.: 1983, Astrophys. J. Suppl. 53,869.Google Scholar
Smith, L.J., Willis, A.J. and Wilson, R.: 1980 Mon. Not. R.A.S., 191,339.Google Scholar
Weaver, R., McCray, R., Castor, J., Shapiro, P. and Moore, R.: 1977, Astrophys. J. 218, 377.CrossRefGoogle Scholar