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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

A star powered by magnetism

Article Abstract:

Neutron stars are the densest objects in the Universe and have strong magnetic fields. Soft gamma-ray repeaters (SGRs) are extremely rare and differ from classical gamma-ray bursters because they have a softer gamma-ray spectra, recurrent outbursts and short durations. New research links SGR1806-20 with an X-ray pulsar with a period of just under eight seconds and a magnetic field much stronger than those of radio pulsars. The star's existence supports the theory that starquakes caused by magnetic stresses produce SGR bursts.

Author: Kulkarni, S.R., Thompson, Christopher
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Gamma ray astronomy, Pulsars, Neutron stars

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Discovery of a cool brown dwarf

Article Abstract:

G1229B is a cool brown dwarf having a temperature of less than 1200 K. The mass of G1229B is about 20-50 times that of Jupiter and it appears to be a companion of the star G1229. An analysis of coronagraphs indicates that G1229B is positioned 7.69 plus or minus 0.1 arcsec from G1229A at PA = 162 degrees plus or minus 1 degree. Measurement of the parallax with the Hubble Space Telescope should provide evidence for the companionship between G1229B and G1229A.

Author: Kulkarni, S.R., Nakajima, T., Oppenheimer, B.R., Golimowski, D.A., Matthews, K., Durrance, S.T.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Brown dwarfs

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Direct detection of pulsations of the Cepheid star zeta Gem and an independent calibration of the period-luminosity relation

Article Abstract:

An optical interferometer is used to directly measure the distance to the ultra-bright Cepheid star zeta Geminorm.

Author: Lane, B.F., Kuchner, M,J,, Boden, A.F., Creech-Eakman, M., Kulkarni, S.R.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
Research, Stars, Cepheids, Cepheid variables, Pulsating stars

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Subjects list: Observations
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