NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Ultraviolet observations of weak-helium starsUltraviolet filter photometry aboard OAO-2 has been carried out for the weak helium stars 3 Cen A, 3 Sco, HD 144334, HD 21699, HD 144844, alpha Scl, HR 8535, HR 8770 and HD 144661. The flux distribution is compared with that of B3 to B8 main sequence and giant stars in terms of color-color diagrams. When allowance is made for line blocking shortward of 2800 A that most of the weak helium stars have normal fluxes in good agreement with their ground-based colors. The star alpha Scl is a light and spectrum variable. The strengthening of Ti II and Sr II lines around 2400 A appears to redistribute flux longward of the Balmer discontinuity. The flux distribution indicates an effective temperature about 1500 K higher than previously determined.
Document ID
19720024200
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bernacca, P. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Molnar, M. R. (Lab. for Atmosphereic and Space Phys.)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: The Sci. Results from the Orbiting Astron. Obs. (OAO-2)
Subject Category
Space Sciences
Accession Number
72N31850
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19720024160Collected WorksThe scientific results from the Orbiting Astronomical Observatory (OAO-2)
No Preview Available