Further identifications of hydrogen in Grw +70/sup 0/8247
Journal Article
·
· Astrophys. J., Lett. Ed.; (United States)
Numerous spectra of the magnetic white dwarf Grw +70/sup 0/8247 were obtained with the double CCD spectrograph at Palomar with signal-to-noise ratio above 100. Five weak absorptions in the blue and four in the red are produced by hydrogen in a strong magnetic field. We compute new, precise, multiparameter, variatioal energy levels yielding intensity and wavelength, from 100 to 600 MG. We search for those Zeeman components with wavelengths nearly constant with field. Two such, which are relatively sharp and strong ..pi.. transitions, explain the Minkowski band, 4137 A (known since 1938), as the 2s0-4f0 and the 5855 A band as the 2s0-3p0. Both have minimum wavelengths at Broughly-equal300 MG. Their absorptions resemble band heads degraded to the red, as observed. The mixed nature of the 4f0 level rsults in an intensity ratio (2s0-4f0)/(2s0-3p0) = 0.58 at 280 MG, high for a line forbidden at zero field. Profiles computed for a pole-on dipole, near logB/sub p/ = 8.5, fit the two observed lines. Other hydrogen transitions (including the core of Ly..cap alpha..) are consistent with that field strength. Six models with a variety of B/sub p/ and inclination are illustrated to show the quality of fit to the observations.
- Research Organization:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Contributing Organization:
- California Institute of Technology, Palomar Observatory
- OSTI ID:
- 5923645
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 289:2; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
BALMER LINES
DWARF STARS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
HYDROGEN
LYMAN LINES
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
NONMETALS
SPECTRA
SPECTRAL SHIFT
STARS
VISIBLE SPECTRA
WAVELENGTHS
WHITE DWARF STARS
ZEEMAN EFFECT
Radio & X-Ray Sources
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
BALMER LINES
DWARF STARS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
HYDROGEN
LYMAN LINES
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
NONMETALS
SPECTRA
SPECTRAL SHIFT
STARS
VISIBLE SPECTRA
WAVELENGTHS
WHITE DWARF STARS
ZEEMAN EFFECT