2014A&A...561L...3G


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET01:59:21

2014A&A...561L...3G - Astronomy and Astrophysics, volume 561, L3-3 (2014/1-1)

Multiplicity of galactic cepheids from long-baseline interferometry. II. The companion of AX Circini revealed with VLTI/PIONIER.

GALLENNE A., MERAND A., KERVELLA P., BREITFELDER J., LE BOUQUIN J.-B., MONNIER J.D., GIEREN W., PILECKI B. and PIETRZYNSKI G.

Abstract (from CDS):

We aim at detecting and characterizing the main-sequence companion of the Cepheid AX Cir (Porb ∼18yrs). The long-term objective is to estimate the mass of both components and the distance to the system. We used the PIONIER combiner at the VLT Interferometer to obtain the first interferometric measurements of the short-period Cepheid AX Cir and its orbiting component. The companion is resolved by PIONIER at a projected separation ρ= 29.2 ±0.2mas and projection angle PA = 167.6 ±0.3°. We measured H-band flux ratios between the companion and the Cepheid of 0.90 ±0.10% and 0.75 ±0.17%, at pulsation phases for the Cepheid of φ= 0.24 and 0.48, respectively. The lower contrast at φ= 0.48 is due to the increased brightness of the Cepheid compared to φ= 0.24. This gives an average apparent magnitude mH (comp) = 9.06 ±0.24mag. The limb-darkened angular diameter of the Cepheid at the two pulsation phases was measured to be θLD = 0.839 ±0.023mas and θLD = 0.742 ±0.020mas, at φ= 0.24 and 0.48, respectively. A lower limit on the total mass of the system was also derived based on our measured separation, and we found MT ≥9.7 ±0.6 M.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - techniques: high angular resolution - stars: variables: Cepheids - binaries: close

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 129462 RG* 14 44 55.4749612588 -58 28 38.974371730   7.122 6.098     K0III 13 0
2 * 26 Cir cC* 14 52 35.2532439095 -63 48 35.417176347   6.66 5.96   4.993 F8II 121 0
3 HD 133869 * 15 09 40.1324267976 -61 29 13.500286670   9.80 7.97     K3III 10 0

    Equat.    Gal    SGal    Ecl

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2019.12.12-01:59:21

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