- Additional Authors
- Description
- 1 microfiche (23, unnumbered pages) : negative, illustrations; 11 x 15 cm.
- Summary
- "International Ultraviolet Explorer measurements of Mg II h and k emission fluxes are presented for 30 F and G stars that are on or near the main sequence and compared with Wilson's measurements of the Ca II h and k fluxes in these stars. The survey includes a large proportion of stars with very low chromospheric activity as well as 111 Tau, X(1) Ori and other examples of strong chromospheric emission. Emission cores are presented in all of the stars observed. A sharp lower limit to the flux in the cores of the k lines implies the existence of a minimum level of chromospheric activity in which the k line flux is a constant fraction of stellar luminosity. Reduction of Wilson's values to absolute fluxes produces a close correlation between Mg and Ca strength with possibly some dependence on color. For the most active stars, the Mg k and Ca fluxes are consistent with the presence of solar plage covering up to one half of the stellar surface. However, the ratio of k to h in these stars is much less than this simple interpretation predicts."--NTIS abstract.
- Series Statement
- NASA-CR ; 175572
- Uniform Title
- NASA contractor report ; NASA-CR 175572.
- Subject
- Bibliography (note)
- Includes bibliographical references (pages 20-21).
- Funding (note)
- Sponsored by the National Aeronautics and Space Administration
- Call Number
- GPO Microfiche NAS 1.26:175572
- OCLC
- marcive191974484
- Author
Doherty, L. R., author.
- Title
A survey of Mg II h and k emission in near-solar type stars / L.R. Doherty.
- Publisher
Madison, WI : Astronomy Department, University of Wisconsin ; [Washington, D.C.] : [National Aeronautics and Space Administration], [1984]
- Type of Content
text
- Type of Medium
microform
- Type of Carrier
microfiche
- Series
NASA-CR ; 175572
NASA contractor report ; NASA-CR 175572.
- Bibliography
Includes bibliographical references (pages 20-21).
- Funding
Sponsored by the National Aeronautics and Space Administration NSG-5242
- Indexed Term
Stellar spectra; Stars; Stellar radiation; Ultraviolet spectra; Chromosphere; Flux (Rate); IUE; Magnesium; Stellar color; Stellar rotation
- Added Author
University of Wisconsin--Madison. Department of Astronomy, issuing body.
United States. National Aeronautics and Space Administration, sponsoring body.
- Other Form:
Online version: Doherty, L. R. Survey of Mg II h and k emission in near-solar type stars (OCoLC)874145515
- Gpo Item No.
0830-H-14 (MF)
- Sudoc No.
NAS 1.26:175572