Gravitational redshift for the Pleiad white dwarf LB 1497
Journal Article
·
· Astrophysical Journal; (United States)
- Dartmouth College, Hanover, NH (United States) California Institute of Technology, Pasadena (United States) North Carolina, University, Chapel Hill (United States)
A new gravitational redshift of +84 {plus minus} 9 km/s is derived for the white dwarf WD 0349 + 247 in the Pleiades (LB 1497) using the Hale 5-m telescope and the MMT. For a carbon core this translates to a mass of 1.02 solar masses using the Hamada-Salpeter mass-radius relation. The effective temperature is derived from the H-{alpha} and H-{beta} line profiles and is found to be 32,000 {plus minus} 1000 K. Using 5.54 mag for the Pleiades distance modulus, this yields log (radius/solar radius) = -2.13 {plus minus} 0.03 for the star. This radius combined with the redshift gives 0.98 solar masses for the star's mass. These values agree with the mass-radius relation and can be used to place constraints on the evolution of the star. 40 refs.
- OSTI ID:
- 5225695
- Journal Information:
- Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 376; ISSN ASJOA; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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