SIMBAD references

2015MNRAS.454.2344P - Mon. Not. R. Astron. Soc., 454, 2344-2352 (2015/December-2)

The orbit and variations of δ Sagittae.

PUGH T., GRAY D.F. and GRIFFIN R.F.

Abstract (from CDS):

Radial-velocity observations spanning more than a century are used to produce a reliable orbit of the δ Sagittae system. We find an orbital period of 3703.7±1.5 d and a semi-amplitude of 7.73±0.05 km/s. In addition, we find quasi-periodic variations with time-scales in the range of 550-750 d and a typical amplitude of 1 km/s. The phase and amplitude are both irregular, sometimes changing very abruptly. We consider pulsation, rotational modulation and convection as possible causes of the variations, finally favouring convection.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): techniques: radial velocities - binaries: spectroscopic - stars: individual: δ Sge - stars: late-type - stars: variables: general

VizieR on-line data: <Available at CDS (J/MNRAS/454/2344): table2.dat>

Simbad objects: 5

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