2023ApJ...958L..22G

Query : 2023ApJ...958L..22G

2023ApJ...958L..22G - Astrophys. J., 958, L22 (2023/December-1)

Rapid Evolution of the White Dwarf Pulsar AR Scorpii.

GARNAVICH P., POTTER S.B., BUCKLEY D.A.H., VAN DYK A., EGBO D., LITTLEFIELD C. and GREIVELDINGER A.

Abstract (from CDS):

Analysis of AR Sco optical light curves spanning 9 yr shows a secular change in the relative amplitudes of the beat pulse pairs generated by the two magnetic poles of its rotating white dwarf. Recent photometry now shows that the primary and secondary beat pulses have similar amplitudes, while in 2015 the primary pulse was approximately twice that of the secondary peak. The equalization in the beat pulse amplitudes is also seen in the linearly polarized flux. This rapid evolution is consistent with precession of the white dwarf spin axis. The observations imply that the pulse amplitudes cycle over a period of ≳40 yr but that the upper limit is currently poorly constrained. If precession is the mechanism driving the evolution, then over the next 10 yr the ratio of the beat pulse amplitudes will reach a maximum followed by a return to asymmetric beat pulses.

Journal keyword(s): Cataclysmic variable stars - DQ Herculis stars - White dwarf stars - Magnetic poles - Rotation powered pulsars

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* AR Sco	EB*	16 21 47.2831986456	-22 53 10.385689092		14.94	14.75			M5+D?	141	0

Query : 2023ApJ...958L..22G

Basic data :

V* AR Sco -- Eclipsing Binary

* (EPIC,SOPS,...), EB* (2016Natur), V* (AN,V*), dS* (2003AstL), Psr (2017NatAs), WD? (2016Natur), PM* (2018yCat), NIR (2MASS), MIR (SSTc2d)

16 21 47.2831986456 -22 53 10.385689092 (Optical) [ 0.0331 0.0210 90 ] A 2020yCat.1350....0G

16 18 47.9651829570 -22 46 05.334886423 [ 0.0331 0.0210 90 ]

353.5192293487943 +18.7120709912035 [ 0.0331 0.0210 90 ]

9.690 -51.489 [0.047 0.038 90] A 2020yCat.1350....0G

8.5437 [0.0376] A 2020yCat.1350....0G

M5+D? D 2016Natur.537..374M

B 14.94 [0.04] E 2012yCat.1322....0Z

V 14.75 [~] D 2017MNRAS.469.3688D

G 14.989848 [0.031394] C 2020yCat.1350....0G

J 12.696 [0.027] C 2003yCat.2246....0C

H 12.080 [0.024] C 2003yCat.2246....0C

K 11.715 [0.024] C 2003yCat.2246....0C

g 14.81 [0.01] E 2012yCat.1322....0Z

r 14.37 [0.01] E 2012yCat.1322....0Z

i 14.28 [0.01] E 2012yCat.1322....0Z

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*`SV HV 1064`**	`EPIC 204298485`	`SSTc2d J162147.3-225310`	*`V AR Sco`**
`AN 216.1904`	`2MASS J16214728-2253102`	`TIC 50098516`	`Gaia DR3 6050296829033196032`
`CRTS J162147.3-225310`	`SOPS IV g-2`	`UCAC4 336-082331`	`Gaia DR2 6050296829033196032`

References (141 between 1850 and 2026) (Total 141)
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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2MASS J16214728-2253102 UCAC4 336-082331 V* AR Sco Gaia DR3 6050296829033196032 Gaia DR2 6050296829033196032

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