2003MNRAS.343..125T

2003MNRAS.343..125T - Mon. Not. R. Astron. Soc., 343, 125-136 (2003/July-3)

A semi-analytical formula for the light variations due to low-frequency g modes in rotating stars.

Through the adoption of the so-called `traditional approximation', a new semi-analytical formula is derived for the light variations produced by low-frequency g modes in uniformly rotating stars. The formula is used to examine the influence of rotation on the variability produced by a stellar model representative of the slowly pulsating B-type class.

It is found that, for all apart from prograde sectoral modes, the Coriolis force acts to trap pulsation within an equatorial waveguide. Towards rapid rotation and/or low pulsation frequency, this waveguide becomes so narrow that only a thin band around the stellar equator makes any appreciable contribution toward flux changes. As a result, unless viewed from near the poles, the variability exhibited by the star becomes very small, possibly explaining why recent photometric observations of rapidly rotating stars have failed to find much evidence for the presence of low-frequency modes.

It is further demonstrated that the ratio between the variability amplitude in pairs of passbands depends, with the introduction of rotation, both on the azimuthal order of a mode, and on the location of the observer in relation to the rotation axis of the star. This means that the standard photometric techniques used to identify modes in non-rotating stars cannot easily be applied to systems where rotation is significant.

Journal keyword(s): methods: analytical - techniques: photometric - stars: oscillations - stars: rotation

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	* d Per	bC*	04 21 33.1662438000	+46 29 55.964841936	4.31	4.757	4.812			B4IV	200	1

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

To bookmark this query, right click on this link: simbad:objects in 2003MNRAS.343..125T and select 'bookmark this link' or equivalent in the popup menu

*` d Per`**	`GEN# +1.00027396`	`PMC 90-93 1227`	`UBV M 10082`
*` 53 Per`**	`GSC 03329-02516`	`PPM 47016`	`uvby98 100027396`
`AG+46 412`	`HD 27396`	`ROT 636`	*`V V469 Per`**
`ALS 7941`	`HIC 20354`	`SAO 39483`	`WEB 3884`
`BD+46 872`	`HIP 20354`	`SKY# 6706`	`[B10] 1003`
`CEL 388`	`HR 1350`	*`SV ZI 283`**	`Gaia DR2 257075615399416448`
`CSV 100379`	`JP11 879`	`TD1 3029`	`Gaia DR3 257075615399416448`
`FK5 2319`	`LS V +46 15`	`TIC 27206041`
`GC 5256`	`2MASS J04213315+4629559`	`TYC 3329-2516-1`
`GCRV 2507`	`NSV 1560`	`UBV 4182`

`AG+46 412`	`ALS 7941`	`BD+46 872`	`CEL 388`	`FK5 2319`
`GSC 03329-02516`	`HD 27396`	`HIC 20354`	`HIP 20354`	`HR 1350`
`LS V +46 15`	`2MASS J04213315+4629559`	`NSV 1560`	`PPM 47016`	`SAO 39483`
`TD1 3029`	`TYC 3329-2516-1`	`uvby98 100027396`	*`V V469 Per`**	`Gaia DR2 257075615399416448`
`Gaia DR3 257075615399416448`