2015MNRAS.454.2344P

Query : 2015MNRAS.454.2344P

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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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1150 2
3 V* FK Com PM* 13 30 46.7996390256 +24 13 57.781233768   9.04 8.245   7.204 G4III 384 1
4 * del Sge SB* 19 47 23.2655973192 +18 32 03.528856248 6.20 5.12 3.81 2.37 1.08 M2II+B0V 208 0
5 * chi Cyg S* 19 50 33.9213430345 +32 54 50.575531294 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 721 0

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