2023ApJ...958..101B

Query : 2023ApJ...958..101B

2023ApJ...958..101B - Astrophys. J., 958, 101 (2023/December-1)

Asteroseismic Study of KUV03442+0719 with Parallax Constraints.

BISCHOFF-KIM A.

Abstract (from CDS):

Hydrogen atmosphere white dwarf KUV03442+0719 was first reported as a pulsator by Gianninas et al. in 2006. Follow-up campaigns by Su et al. revealed more periods. Some spectroscopic results suggest that KUV03442+0719 has a slightly below-average mass and an effective temperature of 11,000 K. However, Gaia data (parallax and magnitude) suggest that it may be a low-mass white dwarf. Such an object would have a helium core. We perform asteroseismic fitting of KUV03442+0719, modeling it both as a carbon/oxygen normal mass white dwarf, and a helium-core low-mass white dwarf. To perform the study, we perform a grid search with WDEC models, refined by simplex minimization of the best fits. Both analyses result in best-fit models that are comparable in terms of quality of fit. More pulsation data would be required to allow us to distinguish between the two scenarios. We present and contrast our results with expectations from stellar evolution. We also provide analytic formulae for a temperature-dependent mass-radius relationship for helium-core white dwarfs.

Journal keyword(s): White dwarf stars - Periodic variable stars - Compact objects - DA stars - Asteroseismology - Stellar astronomy - Stellar 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	KUV 03442+0719	WD*	03 46 51.3356330712	+07 28 02.741132460		16.2	16.10	16.4		DA4.5	24	0

Query : 2023ApJ...958..101B

Basic data :

KUV 03442+0719 -- White Dwarf

WD* (2010ApJ,WD), * (USNO,Gaia), UV (GALEX,KUV), WD? (2021MNRAS), NIR (2MASS)

03 46 51.3356330712 +07 28 02.741132460 (Optical) [ 0.0605 0.0382 90 ] A 2020yCat.1350....0G

03 44 10.3878249076 +07 18 48.980763615 [ 0.0605 0.0382 90 ]

180.1922606793043 -35.2446448946376 [ 0.0605 0.0382 90 ]

-3.567 -24.074 [0.077 0.051 90] A 2020yCat.1350....0G

V(km/s) -1.5 [3.4] / z(spectroscopic) -0.000005 [0.000011] / cz -1.50 [3.40] (Opt) C 2020A&A...638A.131N

7.1846 [0.0643] A 2020yCat.1350....0G

DA4.5 C 2011ApJ...743..138G

B 16.2 [~] E ~

V 16.10 [~] D 2010ApJ...714.1037L

R 16.4 [~] E 2003AJ....125..984M

G 16.597692 [0.002916] C 2020yCat.1350....0G

J 16.47 [0.11] D 2003yCat.2246....0C

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`WD 0344+073`	`KUV 03442+0719`	`TIC 468887063`	`Gaia DR3 3277341526122556160`
`GALEX J034651.3+072802`	`2MASS J03465131+0728026`	`USNO-B1.0 0974-00044490`	`Gaia DR2 3277341526122556160`

References (24 between 1850 and 2026) (Total 24)
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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`WD 0344+073`	`GALEX J034651.3+072802`	`2MASS J03465131+0728026`	`USNO-B1.0 0974-00044490`	`Gaia DR3 3277341526122556160`
`Gaia DR2 3277341526122556160`

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