2023ApJ...943..113S

Query : 2023ApJ...943..113S

2023ApJ...943..113S - Astrophys. J., 943, 113 (2023/February-1)

Asteroseismology of the Pulsating Extremely Low-mass White Dwarf SDSS J111215.82 + 111745.0: A Model with p-mode Pulsations Consistent with the Observations.

SU J. and LI Y.

Abstract (from CDS):

SDSS J111215.82+111745.0 is the second pulsating extremely low-mass white dwarf discovered. Two short-period pulsations, 107.56 and 134.275 s, were detected on this star, which would be the first observed pressure mode (p-mode) pulsations observed on a white dwarf. While the two potential p-modes have yet to be confirmed, they make SDSS J111215.82+111745.0 an interesting object. In this work, we analyzed the whole set of seven periods observed on SDSS J111215.82+111745.0. We adopt three independent period-spacing tests to reveal a roughly 93.4 s mean period spacing of ℓ = 1 g-modes, which gives added credence to the ℓ = 1 identifications. Then we perform asteroseismic modeling for this star, in which the H chemical profile is taken as a variable. The stellar parameters M = 0.1650 ± 0.0137 M☉ and Teff = 9750 ± 560 K are determined from the best-fit model, and the H/He chemical profiles are also defined. The two suspected p-modes are also well represented in the best-fit model, and both the stellar parameters and the pulsation frequencies are in good agreement with the values derived from spectroscopy.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): White dwarf stars - Asteroseismology - Stellar pulsations - Pulsation modes

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 GALEX J111215.8+111745 WD* 11 12 15.8349560304 +11 17 45.120382836   16.54 16.31 16.2   DA 32 0

Query : 2023ApJ...943..113S

Basic data :
GALEX J111215.8+111745 -- White Dwarf
Other object types: otypes_help 		* (UCAC4,USNO,...), MIR (WISEA,WISE), WD* (2012ApJ), PM* (2018yCat), Pu* (2013MNRAS), UV (GALEX), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		11 12 15.8349560304 +11 17 45.120382836 (Optical) [ 0.0484 0.0391 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		11 09 39.4047684771 +11 34 05.053988596 [ 0.0484 0.0391 90 ]
Gal coord. (ep=J2000) : 		242.3207316439490 +61.8382172048491 [ 0.0484 0.0391 90 ]
Proper motions mas/yr : 		-55.539 -12.636 [0.053 0.045 90] A 2020yCat.1350....0G
Parallaxes (mas): 		2.7508 [0.0532] A 2020yCat.1350....0G
Spectral type: 		DA D 2012ApJ...744..142B
Fluxes (11) :
B 16.54 [0.14] D 2012yCat.1322....0Z
V 16.31 [0.04] D 2012yCat.1322....0Z
R 16.2 [0.35] D 1998USNO2.C......0M
G 16.335196 [0.002997] C 2020yCat.1350....0G
J 16.059 [0.105] D 2003yCat.2246....0C
H 16.145 [0.241] D 2003yCat.2246....0C
u (AB) 17.151 [0.010] B 2009ApJS..182..543A
g (AB) 16.251 [0.003] B 2009ApJS..182..543A
r (AB) 16.395 [0.004] B 2009ApJS..182..543A
i (AB) 16.529 [0.004] B 2009ApJS..182..543A
z (AB) 16.696 [0.011] C 2009ApJS..182..543A
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Identifiers (12) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

UCAC4 507-051560 SDSS J111215.82+111745.0 USNO-B1.0 1012-00190926 EQ J1112+1117
GALEX J111215.8+111745 TIC 290904838 WISEA J111215.79+111745.1 Gaia DR3 3963587822967516032
2MASS J11121585+1117448 USNO-A2.0 0975-06673059 WISE J111215.79+111745.0 Gaia DR2 3963587822967516032

References (32 between 1850 and 2026) (Total 32)
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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Collections of Measurements Description of Measurements

Distance : 3    Fe/H : 1    Plx : 2    PM : 2    SpT : 2   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : GALEX J111215.8+111745

Link by name to the catalogue in VizieR :

UCAC4 507-051560 GALEX J111215.8+111745 2MASS J11121585+1117448 SDSS J111215.82+111745.0 USNO-A2.0 0975-06673059
USNO-B1.0 1012-00190926 WISEA J111215.79+111745.1 WISE J111215.79+111745.0 Gaia DR3 3963587822967516032 Gaia DR2 3963587822967516032

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