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 (48) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (47)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Subdwarfs. II - The missing halo-population K subdwarfs
Authors:
Bessell, M. S.; Wickramasinghe, D. T.
Affiliation:
AA(Mt. Stromlo and Siding Spring Observatory, Canberra, Australia), AB(Australian National University, Canberra, Australia)
Publication:
Astrophysical Journal, Part 1, vol. 227, Jan. 1, 1979, p. 232-243. (ApJ Homepage)
Publication Date:
01/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
HALOS, STELLAR ATMOSPHERES, SUBDWARF STARS, UBV SPECTRA, ABUNDANCE, ATMOSPHERIC MODELS, COLORIMETRY, OPACITY, STATISTICAL ANALYSIS, STELLAR LUMINOSITY, STELLAR TEMPERATURE, WHITE DWARF STARS
Comment:
A&AA ID. AAA025.126.002
DOI:
10.1086/156722
Bibliographic Code:
1979ApJ...227..232B

Abstract

It is suggested that most of the high ultraviolet-excess objects found by Eggen are halo G and K subdwarfs with (log of) metal abundances less than -1.3. The analysis leading to this conclusion is concerned with model atmospheres constructed for a grid of models with log g = 5.0 and 4.0, effective temperatures between 6000 K and 3500 K, and metal abundances such that -6 is less than log (metal abundance) which is less than 0. Theoretical line free colors in the UBVRI and the uvby systems are computed from the models, and these data, along with calculation of the tangential velocities as less than 400 km/s, supports the identification of the HUV objects with the subdwarfs. It is suggested that a group of red stars which seem to have luminosities between the main sequence and the subdwarf sequence are unevolved dwarf stars.

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