2012A&A...544L...6V

Query : 2012A&A...544L...6V

2012A&A...544L...6V - Astronomy and Astrophysics, volume 544, L6-6 (2012/8-1)

Photometry of two DQ white dwarfs. Search for spots.

VORNANEN T. and BERDYUGIN A.

Abstract (from CDS):

The intensity profiles of the C2 Swan bands in cool DQ white dwarfs cannot be adequately fitted with models that otherwise succesfully reproduce spectral features of the molecule CH in these stars. Initial modelling showed that a two-component atmosphere in the style of a spot might be able to solve the problem. We photometrically observed the two cool DQ white dwarfs GJ1117 and EGGR78 to search for variability caused by stellar spots. We have not found any such variability, but we estimate the effects of hypothetical spots on lightcurves. We also estimate detection probabilities for spots in different configurations. Alternative explanations of the problem are needed and briefly discussed.

Abstract Copyright: ∼

Journal keyword(s): white dwarfs - starspots - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/544/L6): table1.dat fits/*>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 EGGR 248 WD* 05 51 19.4818569216 -00 10 21.107152956   15.06 14.60     DQ8P 149 0
2 Ton 368 WD* 08 59 14.7138293023 +32 57 12.158356354   15.18   14.9   DQ6 99 0
3 LAWD 35 WD* 11 18 15.0642058690 -03 14 05.576521670   15.39 15.40     DC5 43 0
4 WG 39 WD* 21 57 38.3567715267 -51 00 31.521044535   14.94 14.73 14.53   DQ7 77 0
5 BD+38 4955 SB* 23 13 38.8205905578 +39 25 02.589638688 11.52 11.67 11.01 10.38 9.92 F6 121 0

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