2022PASJ...74..857S

Query : 2022PASJ...74..857S

2022PASJ...74..857S - Publ. Astron. Soc. Jap., 74, 857-876 (2022/August-4)

Analytic model for photometric variation due to starspots on a differentially rotating star.

SUTO Y., SASAKI S., NAKAGAWA Y. and BENOMAR O.

Abstract (from CDS):

We present an analytic model of the light-curve variation for stars with non-evolving starspots on a differentially rotating surface. The Fourier coefficients of the harmonics of the rotation period are expressed in terms of the latitude of the spot, ℓ_s, and the observer's line-of-sight direction, ℓ_o, including the limb-darkening effect. We generate different realizations of multi-spots according to the model, and perform mock observations of the resulting light-curve modulations. We discuss to what extent one can recover the properties of the spots and the parameters for the differential rotation law from the periodogram analysis. Although our analytical model neglects the evolution of spots on the stellar surface (dynamical motion, creation, and annihilation), it provides a basic framework to interpret the photometric variation of stars, in particular from the existing Kepler data and the future space-born mission. It is also applicable to photometric modulations induced by rotation of various astronomical objects.

Abstract Copyright: © The Author(s) 2022. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): stars: rotation - starspots - Sun: faculae, plages - sunspots

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	Cl* NGC 6819 SHLP 10328	BY*	19 39 19.9396354224	+40 14 26.588985144			16.900	16.390		~	13	0

Query : 2022PASJ...74..857S

Basic data :

Cl* NGC 6819 SHLP 10328 -- BY Dra Variable

BY* (), * (2021ApJS,Cl*,...), Er* (2019ApJS), Ro* (2013A&A), NIR (2MASS)

19 39 19.9396354224 +40 14 26.588985144 (Optical) [ 0.0355 0.0424 90 ] A 2020yCat.1350....0G

19 37 37.4621409285 +40 07 29.514984407 [ 0.0355 0.0424 90 ]

073.8453419187621 +08.8370465025533 [ 0.0355 0.0424 90 ]

-2.184 -8.246 [0.049 0.052 90] A 2020yCat.1350....0G

0.6114 [0.0438] A 2020yCat.1350....0G

V 16.900 [0.400] D 2005MNRAS.358..795S

R 16.390 [0.406] D 2005MNRAS.358..795S

G 16.773987 [0.003517] C 2020yCat.1350....0G

J 15.093 [0.042] C 2003yCat.2246....0C

H 14.630 [0.053] C 2003yCat.2246....0C

K 14.402 [0.092] C 2003yCat.2246....0C

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*`Cl NGC 6819 SHLP 10328`**	`2MASS J19391993+4014266`	`Gaia DR2 2076497394911441792`
`KIC 5110407`	`TIC 138728045`	`Gaia DR3 2076497394911441792`

References (13 between 1850 and 2026) (Total 13)
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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KIC 5110407 2MASS J19391993+4014266 Gaia DR2 2076497394911441792 Gaia DR3 2076497394911441792

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