S stars without technetium - The binary star connection

An exploratory survey of non-Mira MS and S star radial velocities and the He I 10830 A triplet are used to test the assertion that S stars without Tc are spectroscopic binaries, probably with white-dwarf companions. It is found that the He I 10830 A triplet is a prominent feature of the spectra of S...

Full description

Saved in:
Bibliographic Details
Published in:The Astronomical journal 1990-06, Vol.99, p.1930-1940
Main Authors: Brown, Jeffery A., Smith, Verne V., Lambert, David L., Dutchover, Edward, Jr, Hinkle, Kenneth H., Johnson, Hollis R.
Format: Article
Language:English
Subjects:
BINARY STARS
CHARGE-COUPLED DEVICES
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DWARF STARS
ELEMENTS
GIANT STARS
METALS
RADIAL VELOCITY
RED GIANT STARS
SEMICONDUCTOR DEVICES
SPECTRA
STARS
TECHNETIUM
TRANSITION ELEMENTS
VELOCITY 640102 > Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources
WHITE DWARF STARS
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An exploratory survey of non-Mira MS and S star radial velocities and the He I 10830 A triplet are used to test the assertion that S stars without Tc are spectroscopic binaries, probably with white-dwarf companions. It is found that the He I 10830 A triplet is a prominent feature of the spectra of S stars without Tc, but the He I line is undetectable in the spectra of most S stars without Tc. Also, when radial-velocity variations attributable to orbital motion are detected for S stars without Tc, the variations have a higher frequency that that of S stars with Tc. The results suggest that the S stars without Tc are spectroscopic binaries and are probably related to the G and K giant Barium stars. (R.B.)
ISSN:0004-6256
1538-3881
DOI:10.1086/115475