NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Spectroscopic and photometric observations of M supergiants in Carina.Spectroscopic study of 30 Southern-Hemisphere M supergiants mostly in Carina in the blue and near-infrared, and photometrical study of these stars from 0.4 to 18 microns. The uncertainties in the determinations of interstellar extinction are discussed, and the spatial distribution of the M supergiants in the Carina arm is shown. The presence of the 11-micron excess attributed to silicate dust is a common feature. Stars of the same spectral type and luminosity class are remarkably homogeneous in their long-wave behavior. The silicate feature becomes more prominent in the more luminous stars and in stars of later spectral type. Four composite systems show little long-wave excess. The two VV Cephei objects have excesses probably produced by gas emission, and the other two have little or no excess - supporting the suggestion that the presence of the early star prohibits the formation of a dust envelope. Three stars - VY CMa, VX Sgr, and HD 9767 - appear to be extreme examples of stars with large excesses over the entire long-wave region. It is suggested that these objects are surrounded by large amounts of particulate material over a great range of distances from the stars.
Document ID
19720035678
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Humphreys, R. M.
Strecker, D. W.
Ney, E. P.
Date Acquired
August 6, 2013
Publication Date
February 15, 1972
Publication Information
Publication: Astrophysical Journal
Volume: 172
Subject Category
Space Sciences
Accession Number
72A19344
Funding Number(s)
CONTRACT_GRANT: NSF GP-19949
CONTRACT_GRANT: NGL-24-005-008
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available