Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· On-line Data
· References in the article
· Citations to the Article (38) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (11)
· Reads History
·
· Translate This Page
Title:
CF Tucanae: Another Case of Coronal MAD Syndrome?
Authors:
Schmitt, J. H. M. M.; Stern, R. A.; Drake, J. J.; Kuerster, M.
Publication:
Astrophysical Journal v.464, p.898 (ApJ Homepage)
Publication Date:
06/1996
Origin:
APJ
ApJ Keywords:
STARS: BINARIES: CLOSE, STARS: CORONAE, STARS: INDIVIDUAL CONSTELLATION NAME: CF TUCANAE, ULTRAVIOLET: STARS
DOI:
10.1086/177378
Bibliographic Code:
1996ApJ...464..898S

Abstract

We present and discuss an extreme-ultraviolet spectrum of the RS CVn binary CF Tuc obtained with the short-wavelength (5W) spectrometer on board the Extreme-Ultraviolet Explorer (EUVE) satellite. In addition to a continuum, only two spectral lines attributed to Fe XXII and Fe XXIII are detected. We show that the EUVE data can be reconciled with a solar abundance plasma only if most of CF Tuc's emission measure is located at temperatures of ≍108 K; alternatively, the plasma must be iron depleted with most of the emission measure located at the peak temperature of the observed line contribution functions. A comparison with previously obtained ROSAT PSPC spectra argues strongly in favor of the latter situation. As a consequence, we are forced to the conclusion that the iron abundance in the corona of CF Tuc is reduced with respect to solar values by factors between 5 and 10. The reasons for the occurrence of this metal abundance deficiency syndrome (MADS) are unclear at present; however, for the specific case of CF Tuc, the extremely low coronal iron abundance might possibly result from an anomalously low photo spheric iron abundance.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints