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)
· References in the article
· Citations to the Article (26) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (5)
· Associated Articles
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Einstein Observations of T Tauri Stars in Taurus-Auriga. II. Relationships between X-Ray Emission and Pre-Main-Sequence Activity
Authors:
Damiani, F.; Micela, G.
Publication:
Astrophysical Journal v.446, p.341 (ApJ Homepage)
Publication Date:
06/1995
Origin:
APJ; KNUDSEN
ApJ Keywords:
STARS: ACTIVITY, STARS: PRE-MAIN-SEQUENCE, X-RAYS: STARS
DOI:
10.1086/175792
Bibliographic Code:
1995ApJ...446..341D

Abstract

On the basis of the full set of reanalyzed Einstein IPC X-ray data on Taurus-Auriga pre-main-sequence stars, presented in a companion paper, we have studied the relationships between the X-ray emission and typical diagnostics of pre-main-sequence activity to obtain indications of the origin of the X-ray emission and of the structure of the outer atmospheres in these stars. We argue that, in the case of classical T Tauri stars, scaling the Hα luminosity to the infrared (disk) emission is much more meaningful physically than scaling it to the stellar continuum (by considering the line equivalent width). We find an inverse relation between the X-ray luminosity and this infrared-scaled Hα emission. We also find an anticorrelation between X-ray luminosity and rotational period, in qualitative agreement with earlier works; this is interpreted in terms of a magnetic origin for the X-ray emission. This relationship, however, is limited to stars younger than 2 × 106 yr, while for the older sample stars, saturation of X-ray surface flux appears to take place. We interpret the relation found between X-ray and infrared-scaled Hα emission as a competition between closed and open magnetic structures on the surface of these stars. In the stars without indications of winds and accretion disks (weak-line T Tauri stars), a correlation between X-ray luminosity and unscaled Hα luminosity is found instead, providing further evidence for the chromospheric origin of the line emission in these latter stars.

Associated Articles

Part 1     Part  2    

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