2019MNRAS.487.3904M

Query : 2019MNRAS.487.3904M

2019MNRAS.487.3904M - Mon. Not. R. Astron. Soc., 487, 3904-3913 (2019/August-2)

Magnetic inhibition of convection in O-star envelopes.

MacDONALD J. and PETIT V.

Abstract (from CDS):

It has been suggested that the absence of macroturbulence in the atmosphere of NGC 1624-2 is due its strong magnetic field (the strongest known for a massive O star) suppressing convection in its outer layers, removing the mechanism thought responsible for the observed macroturbulence in stars with lower field strengths. Here, we develop and apply a criterion for a uniform magnetic field to suppress convection in stellar envelopes in which radiation pressure is a significant contributor to hydrostatic balance. We find upper mass limits of ∼55 and ∼30 M_☉ for magnetic suppression to be possible in zero-age main-sequence and terminal-age main-sequence stars, respectively. For evolved stars, magnetic suppression of convection can significantly alter the stars' evolution. For NGC 1624-2, we find that a polar dipole strength of 16.5 ± 5.9 kG is required to suppress convection, in good agreement with the value ∼20 kG measured by spectropolarimetry.

Journal keyword(s): stars: early-type - stars: evolution - stars: magnetic fields - stars: massive

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	NGC 1624 2	*	04 40 37.2758720568	+50 27 41.040508572	11.9	12.47	11.57			O7f?cp	62	0

Query : 2019MNRAS.487.3904M

Basic data :

NGC 1624 2 -- Star

* (2010MNRAS,ALS,...), NIR (2MASS)

04 40 37.2758720568 +50 27 41.040508572 (Optical) [ 0.1429 0.0886 90 ] A 2020yCat.1350....0G

04 36 47.7723154211 +50 21 53.043836550 [ 0.1429 0.0886 90 ]

155.3596501201692 +02.6099917935919 [ 0.1429 0.0886 90 ]

0.025 0.108 [0.175 0.124 90] A 2020yCat.1350....0G

1.3965 [0.3624] A 2018yCat.1345....0G

O7f?cp D 2014ApJS..211...10S

U 11.9 [~] D 2003AJ....125.2531R

B 12.47 [0.38] D 2000A&A...355L..27H

V 11.57 [0.20] D 2000A&A...355L..27H

G 11.595191 [0.003003] C 2020yCat.1350....0G

J 10.380 [0.024] C 2003yCat.2246....0C

H 10.21 [0.03] C 2003yCat.2246....0C

K 10.059 [0.021] C 2003yCat.2246....0C

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`NGC 1624 1`	`GOS G155.36+02.61 01`	`MFJ SH 2-212 2`	`TYC 3350-255-1`
`ALS 18660`	`GSC 03350-00255`	`NGC 1624 2`	`Gaia DR2 260166892342134528`
`CSI+50-04368`	`2MASS J04403728+5027410`	`TIC 354879267`	`Gaia DR3 260166892342134528`

References (62 between 1850 and 2026) (Total 62)
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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`ALS 18660`	`GSC 03350-00255`	`2MASS J04403728+5027410`	`TYC 3350-255-1`	`Gaia DR2 260166892342134528`
`Gaia DR3 260166892342134528`

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