2012MNRAS.419.3393K

Query : 2012MNRAS.419.3393K

2012MNRAS.419.3393K - Mon. Not. R. Astron. Soc., 419, 3393-3398 (2012/February-1)

δ Scuti light variations as a test for choosing the mechanism of cyclic orbital period changes in Algols.

KHALIULLIN K.F. and KHALIULLINA A.I.

Abstract (from CDS):

The temporal behaviour of the orbital period and pulsation period of the δ Scuti type primary component is studied in the eclipsing binary AB Cas, where the secondary fills its Roche lobe. Orbital period changes observed over 80 years are a superposition of secular variations due to mass exchange between the components and cyclic variations with a quasi-period of about 46 years. At the same time, the period of δ Scuti light variations is found to remain constant to a high accuracy. This result rules out the explanation of cyclic orbital period changes in AB Cas by the presence of a third body and forces us to seek other interpretations. In view of our results, the only mechanism that currently seems to be acceptable for the observed cyclic orbital period changes in AB Cas and, possibly, many other Algols is the mechanism proposed by [Applegate in 1992], which explains these modulations by the variations in the quadrupole moment of the component with a convective shell caused by its cyclic magnetic activity.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): binaries: eclipsing - stars: individual: AB Cas - stars: magnetic field - stars: oscillations

Simbad objects: 1

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Number of rows : 1

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	V* AB Cas	EB*	02 37 31.5117717168	+71 18 16.272987552		10.59	10.32			A3	166	0

Query : 2012MNRAS.419.3393K

Basic data :

V* AB Cas -- Eclipsing Binary

* (BD,GEN#,...), V* (AN,V*), dS* (2012MNRAS), EB* (2022yCat), NIR (2MASS)

02 37 31.5117717168 +71 18 16.272987552 (Optical) [ 0.0105 0.0135 90 ] A 2020yCat.1350....0G

02 32 55.1586741859 +71 05 14.519401860 [ 0.0105 0.0135 90 ]

131.2935351302214 +10.1758553183193 [ 0.0105 0.0135 90 ]

-33.069 19.733 [0.012 0.018 90] A 2020yCat.1350....0G

V(km/s) -67.10 [~] / z(~) -0.000224 [~] / cz -67.09 [~] D 1994A&AS..108..603B

3.0323 [0.0151] A 2020yCat.1350....0G

A3 E 1934BHarO.897...12C

B 10.59 [~] E ~

V 10.32 [~] E ~

G 10.119364 [0.004051] C 2020yCat.1350....0G

J 9.279 [0.020] C 2003yCat.2246....0C

H 9.074 [0.024] C 2003yCat.2246....0C

K 9.023 [0.020] C 2003yCat.2246....0C

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`BD+70 193`	`HIC 12235`	`TYC 4320-505-1`	`Gaia DR1 545203182914118784`
`AN 259.1928`	`HIP 12235`	*`V AB Cas`**
`GEN# +0.07000193`	`2MASS J02373151+7118163`	`Gaia DR2 545203187211651072`
`GSC 04320-00505`	`TIC 354922610`	`Gaia DR3 545203187211651072`

References (166 between 1850 and 2026) (Total 166)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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`BD+70 193`	`GSC 04320-00505`	`HIC 12235`	`HIP 12235`	`2MASS J02373151+7118163`
`TYC 4320-505-1`	*`V AB Cas`**	`Gaia DR2 545203187211651072`	`Gaia DR3 545203187211651072`	`Gaia DR1 545203182914118784`

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