2018A&A...616A.130L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.12CEST21:46:24

2018A&A...616A.130L - Astronomy and Astrophysics, volume 616A, 130-130 (2018/8-1)

KIC 8553788: A pulsating Algol with an extreme mass ratio.

LIAKOS A.

Abstract (from CDS):


Context. The present research paper focuses on the eclipsing binary KIC 8553788 which belongs to two different types of binary systems regarding its physical properties. In particular, it is one of the 71 oscillating stars of Algol-type that have been discovered so far and one of the six that have been published based on high-cadence photometric data of the Kepler mission. In addition, it is one of the four semi-detached binaries of the group of R CMa-type systems, while its pulsating component has the fourth fastest frequency among the δ Scuti stars-members of semi-detached binaries. Detailed light curves as well as spectroscopic and pulsation analyses are presented, while possible explanation scenarios for the evolution of the system involving past mass transfer, mass loss, and/or angular momentum loss due to the presence of a tertiary component are discussed.
Aims. The goal of the study is to extract the pulsational characteristics of the oscillating star of the system, to estimate the absolute parameters of its components, and to provide a possible explanation for its extreme evolutionary status.
Methods. Ground-based spectroscopic observations using the 2.3m "Aristarchos" telescope were obtained and used for the estimation of the spectral type of the primary component and to model the light curves of the system with higher certainty. The short-cadence photometric data provided by the Kepler mission were analysed using standard eclipsing binary modelling techniques, while Fourier analysis was applied on their residuals aiming to reveal the properties of the intrinsic oscillations. The resulting photometric model was combined with a published radial velocity curve to obtain accurate absolute parameters for the components of the system.
Results. The results show that the primary component of the system is of A8 spectral type, has a mass of 1.6M, and a radius of 2R. It is a relatively fast pulsator of δ Scuti type that oscillates in 89 frequency modes with the dominant one being 58.26 cycles/day. On the other hand, the secondary component has a mass of only 0.07M, a radius of 1R, and a temperature of 4400K. In addition, it was found to be magnetically active with migrating cool spots on its surface.
Conclusions. KIC 8553788, according to its geometrical configuration and its pulsational properties, belongs to the group of oscillating stars of Algol type, while according to its very low mass ratio and its relatively short orbital period belongs also to the group of R CMa stars. If confirmed by radial velocity data of the secondary component, the system would have the lowest mass ratio that has ever been found in semi-detached systems and could therefore be considered as one of the most extreme cases.

Abstract Copyright: © ESO 2018

Journal keyword(s): binaries: eclipsing - stars: fundamental parameters - binaries: close - stars: oscillations - stars: variables: delta Scuti - stars: individual: KIC 8553788

Simbad objects: 20

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Number of rows : 20

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 OGLE SMC-ECL- 63 Al* 00 26 08.86 -72 07 01.6   16.12 15.844   15.482 ~ 21 0
2 HD 14221 PM* 02 19 22.6770593690 +48 57 19.662639303 6.800 6.820 6.410     F4V 54 0
3 V* RZ Cas Al* 02 48 55.5096536172 +69 38 03.441544807   6.40 6.26     A3V 438 0
4 HD 18660 * 02 59 01.3518884016 -34 11 20.660574138   8.26 6.68     K5/M0III 10 0
5 V* AS Eri Al* 03 32 25.1262238528 -03 18 48.096045754   8.49 8.30     A1V 159 0
6 V* R CMa Al* 07 19 28.1782479807 -16 23 42.900652548 6.09 6.05 5.70     F2III/IV 263 0
7 V* OO Dra Al* 11 40 01.4401139924 +75 09 21.466975904   11.42 11.386     ~ 19 0
8 1SWASP J162842.31+101416.7 EB* 16 28 42.2807606122 +10 14 16.522433206   13.10 12.87 12.90   ~ 15 1
9 HD 169840 PM* 18 26 00.9998162862 +15 45 30.361086583   7.82 7.40     F3V 20 0
10 KIC 11175495 bL* 18 50 11.3304081254 +48 51 23.063924912           A4V 16 0
11 V* WX Dra Al* 18 52 10.4970196876 +47 48 16.781598239   13.260 12.794 13.495 12.381 A7V 38 0
12 KIC 8087799 EB* 19 12 16.6112022037 +43 54 18.325126686           ~ 8 0
13 KOI-7055 Al* 19 17 42.9140596274 +44 38 29.023885943   12.69 12.19   12.358 A7V 25 0
14 TYC 3547-2135-1 bL* 19 21 11.6185430446 +47 58 42.954059789   9.79 9.53   9.330 A5IV 45 0
15 KOI-5894 EB* 19 25 11.2789535623 +49 14 40.009649413           ~ 15 0
16 TYC 3556-2801-1 dS* 19 34 59.8377574440 +45 45 42.260282451   12.95 12.27     ~ 14 0
17 KOI-7397 SX* 19 49 34.4306699452 +48 24 38.693651228       14.12   A5V 17 0
18 [DCO2008] T-Cyg1-01956 Al* 19 53 29.111664 +47 48 49.81320   12.07 11.62 11.75   ~ 22 0
19 KOI-7004 bL* 20 01 19.8042828144 +44 08 38.852060885   12.97 12.87     ~ 35 0
20 V* AU Lac Al* 22 15 17.0819339418 +48 43 16.908026647   12.15 11.81     A5: 34 0

    Equat.    Gal    SGal    Ecl

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2020.08.12-21:46:24

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