2005A&A...442..651E

Query : 2005A&A...442..651E

2005A&A...442..651E - Astronomy and Astrophysics, volume 442651-660 (2005/11-1)

Zeeman tomography of magnetic white dwarfs. II. The quadrupole-dominated magnetic field of HE1045-0908.

EUCHNER F., REINSCH K., JORDAN S., BEUERMANN K. and GAENSICKE B.T.

Abstract (from CDS):

We report time-resolved optical flux and circular polarization spectroscopy of the magnetic DA white dwarf HE1045-0908 obtained with FORS1 at the ESO VLT. Considering published results, we estimate a likely rotational period of P_rot≃2.7h, but cannot exclude values as high as about 9h. Our detailed Zeeman tomographic analysis reveals a field structure which is dominated by a quadrupole and contains additional dipole and octupole contributions, and which does not depend strongly on the assumed value of the period. A good fit to the Zeeman flux and polarization spectra is obtained if all field components are centred and inclinations of their magnetic axes with respect to each other are allowed for. The fit can be slightly improved if an offset from the centre of the star is included. The prevailing surface field strength is 16MG, but values between 10 and ∼75MG do occur. We derive an effective photospheric temperature of HE1045-0908 of T_eff=10000±1000K. The tomographic code makes use of an extensive database of pre-computed Zeeman spectra (Paper I, Euchner et al., 2002A&A...390..633E).

Abstract Copyright: ∼

Journal keyword(s): white dwarfs - stars: magnetic fields - stars: atmospheres - stars: individual: HE1045-0908 - polarization

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	HE 1045-0908	WD*	10 47 36.1228977120	-09 24 32.628359808		16.78	16.74			DA	31	0

Query : 2005A&A...442..651E

Basic data :

HE 1045-0908 -- White Dwarf

WD* (1994A&A,WD), WD? (2018MNRAS), PM* (2018yCat), * (Gaia), UV (GALEX), NIR (2MASS)

10 47 36.1228977120 -09 24 32.628359808 (Optical) [ 0.0616 0.0529 90 ] A 2020yCat.1350....0G

10 45 05.6337544983 -09 08 40.638254287 [ 0.0616 0.0529 90 ]

259.2420084376628 +42.7174754102251 [ 0.0616 0.0529 90 ]

55.985 -20.764 [0.073 0.060 90] A 2020yCat.1350....0G

18.4767 [0.0739] A 2020yCat.1350....0G

DA D 1994A&A...285..995R

B 16.78 [~] E ~

V 16.74 [~] E ~

G 16.447231 [0.002987] C 2020yCat.1350....0G

J 16.239 [0.080] C 2003yCat.2246....0C

H 16.229 [0.163] D 2003yCat.2246....0C

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`WD 1045-091`	`GALEX J104736.1-092432`	`2MASS J10473610-0924324`	`Gaia DR2 3761499853524374784`
`EC 10450-0908`	`HE 1045-0908`	`TIC 55096188`	`Gaia DR3 3761499853524374784`

References (31 between 1850 and 2026) (Total 31)
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 1045-091 GALEX J104736.1-092432 2MASS J10473610-0924324 Gaia DR2 3761499853524374784 Gaia DR3 3761499853524374784

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