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Astron. Astrophys. 354, 995-998 (2000)

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Orbital elements of the double B star HR 2875

S. Vennes

Department of Mathematics and Astrophysical Theory Centre, Australian National University, Canberra, ACT 0200, Australia (vennes@maths.anu.edu.au)

Received 20 October 1999 / Accepted 22 December 1999

Abstract

Echelle spectroscopy has been obtained at Lick Observatory and at Mount Stromlo Observatory which reveals that the B star plus white dwarf system HR 2875 is actually a triple system comprised of the B3.5 primary, a B6 secondary and the white dwarf. Orbital parameters for the two B stars have been determined and indicate a period [FORMULA]15.0811 days and an eccentricity [FORMULA]0.68. The location of the white dwarf relative to the pair of B stars is unknown but may be sufficiently close to perturb their orbit. Further studies of the triple system are planned.

Key words: stars: binaries: spectroscopic – stars: early-type – stars: individual: HR 2875 – stars: white dwarfs – ultraviolet: stars

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© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000
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