SIMBAD references

2000MNRAS.318..974J - Mon. Not. R. Astron. Soc., 318, 974-982 (2000/November-2)

Radial velocities of pulsating subdwarf B stars: KPD 2109+4401 and PB 8783.

JEFFERY C.S. and POLLACCO D.

Abstract (from CDS):

High-speed spectroscopy of two pulsating subdwarf B stars, KPD 2109+4401 and PB 8783, is presented. Radial motions are detected with the same frequencies as reported from photometric observations and with amplitudes of ∼2km.s–1 in two or more independent modes. These represent the first direct observations of surface motion arising from multimode non-radial oscillations in subdwarf B stars. In the case of the sdB+F binary PB8783, the velocities of both components are resolved; high-frequency oscillations are found only in the sdB star and not the F star. There also appears to be evidence for mutual motion of the binary components. If confirmed, it implies that the F-type companion is ≳1.2 times more massive than the sdB star, while the amplitude of the F-star acceleration over 4h would constrain the orbital period to lie between 0.5 and 3.2d.

Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): stars: individual: KPD 2109+4401 - stars: individual: PB 8783 - stars: oscillations - subdwarfs - stars: variables: other

Simbad objects: 4

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