19th European Workshop on White Dwarfs

Title:	19th European Workshop on White Dwarfs
Volume:	493	Year:	2015	View this Volume on ADS
Editors:	Dufour, P.; Bergeron, P.; Fontaine, G.
Synopsis:	19th EUROPEAN WORKSHOP ON WHITE DWARFS Montreal, Canada 11-15 August, 2014 The 19th European Workshop on White Dwarfs held at the Université de Montréal, Canada, August 11-15, 2014. This meeting was part of a series of biennial conferences founded some 40 years ago by the late Professor Volker Weidemann at the University of Kiel, Germany, and which now draws participants from around the globe. Indeed, the European Workshops on White Dwarfs have become the most significant scientific gatherings of researchers interested in this type of stars. These proceedings constitute a snapshot of current research on white dwarf stars suitable for scientists and graduate students studying these important stars. The 19th European Workshop on White Dwarfs in Montréal was attended by 130 participants from 21 different countries. A large fraction of the attendees were graduate students and postdocs, reflecting the youthfulness and vitality of the white dwarf community. The main scientific topics discussed were: 1) Atmospheres, Abundance Analyses, and Chemical Composition; 2) Structure, Evolution, and Ages; 3) Pulsating White Dwarfs and Asteroseismology; 4) Disks, Dust, and Planets around White Dwarfs; 5) Fundamental Properties of White Dwarfs; 6) Properties of White Dwarf Populations and Clusters; 7) Physical Processes in White Dwarfs; 8) Surveys: Results and Prospects; 9) White Dwarfs in Binaries; 10) Central Stars of Planetary Nebulae; and 11) Supernova Progenitors and Supernovae.
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Paper Title	Page	Authors

Book Cover		Dufour, P.; Bergeron, P.; Fontaine, G.
Front Matter
Front Matter	1	Dufour, P.; Bergeron, P.; Fontaine, G.
Conference Photos	2	Dufour, P.; Bergeron, P.; Fontaine, G.
Part I. Atmospheres, Abundance Analyses, Chemical Composition
Detection of Arsenic in the Atmospheres of Dying Stars	3	Chayer, P.; Dupuis, J.; Kruk, J. W.
HD188112: Supernova Ia Progenitor?	9	Latour, M.; Irrgang, A.; Heber, U.; Schaffenroth, V.
A Possible Solution to the Lyman/Balmer Line Problem in Hot DA White Dwarfs	15	Preval, S. P.; Barstow, M. A.; Badnell, N. R.; Holberg, J. B.; Hubeny, I.
Hot, Hydrogen-deficient White Dwarfs in the Sloan Digital Sky Survey Data Release 10	21	Reindl, N.; Rauch, T.; Werner, K.; Kepler, S. O.; Gänsicke, B.; Gentile Fusillo, N. P.
Trans-iron Elements in the Hot DO-type White Dwarf RE0503–289 and the Prospective Search for Technetium	27	Werner, K.; Rauch, T.; López-Urrutia, J. R. C.; Kruk, J. W.; Kučas, S.; Quinet, P.
On the Origin of Hydrogen in DB White Dwarfs	33	Bergeron, P.; Rolland, B.; Limoges, M.-M.; Giammichele, N.; Séguin-Charbonneau, L.; Green, E. M.
Magnetic Atmosphere Models for White Dwarfs with Heavy Elements	37	Dufour, P.; Jordan, S.; Blouin, S.; Tardif, F.; Groulx, J.; Kilic, M.; Gianninas, A.; Barber, S. D.; Gilligan, C.
Photometric and Spectroscopic Analysis of Warm DQ White Dwarfs	41	Fortier, A.; Dufour, P.
Comparative Analysis of Atmospheric Parameters Obtained from the Photometric and Spectroscopic Techniques	45	Genest-Beaulieu, C.; Bergeron, P.; Darveau-Bernier, A.
TheoSSA - Model WD Spectra on Demand: The Impact of Ne, Na, Mg, and Iron-group Elements on the Balmer Lines	49	Reindl, N.; Rauch, T.
Model Atmosphere Analysis of the Magnetic Field in Cool, Hydrogen-line (DA) White Dwarfs	53	Rolland, B.; Bergeron, P.
Part II. Structure and Evolution, Ages
Amplitude Variability as Evidence of Crystallization in GD 518 and Other Massive Pulsating White Dwarfs	59	Hermes, J. J.; Kepler, S. O.; Montgomery, M. H.; Gianninas, A.; Castanheira, B. G.; Winget, D. E.
Rotation of White Dwarf Stars	65	Kawaler, S. D.
Rotation and Strong Magnetism of White Dwarfs	71	Kissin, Y.; Thompson, C.
Atmospheric Parameters and Carbon Abundance for Hot DB White Dwarfs	77	Koester, D.; Provencal, J.; Gänsicke, B. T.
Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results	83	Miller Bertolami, M. M.
Calibration of the Mixing-Length Free Parameter for White Dwarf Structures	89	Tremblay, P.-E.; Ludwig, H.-G.; Freytag, B.; Fontaine, G.; Steffen, M.; Brassard, P.
The Very Fast Evolution of the VLTP Object V4334 Sgr	95	van Hoof, P. A. M.; Kimeswenger, S.; Van de Steene, G. C.; Zijlstra, A. A.; Hajduk, M.; Herwig, F.
Fingering Convection and its Consequences for Accreting White Dwarfs	101	Vauclair, S.; Vauclair, G.; Deal, M.; Wachlin, F. C.
Deriving the Ages of Field White Dwarfs	107	von Hippel, T.; van Dyk, D.; Si, S.; Montgomery, M. H.; O'Malley, E.; Robinson, E.; Stenning, D.; Stein, N.; Kraczek, E. J.; Jefferys, W. H.; Webster, A.
Metal Accretion onto White Dwarfs. I. The Approximate Approach Based on Estimates of Diffusion Timescales	113	Fontaine, G.; Brassard, P.; Dufour, P.; Tremblay, P.-E.
Metal Accretion onto White Dwarfs. II. A Better Approach Based on Time-Dependent Calculations in Static Models	117	Fontaine, G.; Chayer, P.; Dupuis, J.; Dufour, P.; Brassard, P.
Metal Accretion onto White Dwarfs. III. A Still Better Approach Based on the Coupling of Diffusion with Evolution	121	Brassard, P.; Fontaine, G.
Improvements in the Montréal Evolutionary Code and Application to White Dwarfs	125	Brassard, P.; Fontaine, G.
On Thermohaline Mixing in Accreting White Dwarfs	129	Koester, D.
Testing Fundamental Particle Physics with the Galactic White Dwarf Luminosity Function	133	Miller Bertolami, M. M.; Melendez, B. E.; Althaus, L. G.; Isern, J.
Determination of the Core Composition of White Dwarfs in M67	137	Simon, A.; Fontaine, G.; Brassard, P.
The Born-again Planetary Nebulae Abell 30 and Abell 78	141	Todt, H.; Guerrero, M. A.; Fang, X.; Toalá, J. A.; Arthur, J. S.; Blair, W. P.; Chu, Y.-H.; Gruendl, R. A.; Hamann, W.-R.; Márquez-Lugo, R. A.; Oskinova, L.; Ruiz, N.; Steffen, M.; Schönberner, D.
Deriving Precise Ages of Field White Dwarfs using Bayesian Techniques	145	Webster, A.; von Hippel, T.; Si, S.; van Dyk, D.; Montgomery, M.; Robinson, E.; Stenning, D.; Stein, N.; Kraczek, E. J.; Jefferys, W. H.; O'Malley, E.
Part III. Pulsating White Dwarfs, Asteroseismology
Method and Tools for an Objective Approach of White Dwarf Asteroseismology	151	Charpinet, S.; Giammichele, N.; Brassard, P.; Van Grootel, V.; Fontaine, G.
Quasi-Periodic Variations of the Pulsation Frequencies of Three White Dwarfs	157	Dalessio, J.; Provencal, J. L.; Shipman, H. L.
Parametric Modeling in Action: High Accuracy Seismology of Kepler DAV Stars	163	Giammichele, N.; Fontaine, G.; Charpinet, S.; Brassard, P.; Greiss, S.
White Dwarfs in the Kepler Field - What's New?	169	Greiss, S.; Gänsicke, B. T.; Hermes, J. J.; Giammichele, N.; Fontaine, G.; Koester, D.; Bell, K.; Breedt, E.; Steeghs, D.
Patterns Emerging from the Asteroseismic Studies of DBVs	175	Bischoff-Kim, A.
An Amplitude Limitation Mechanism for Pulsating White Dwarfs	181	Montgomery, M. H.; Romero, A. D.; Córsico, A. H.
Nonlinear Analysis of Pulsating White Dwarf Lightcurves	187	Provencal, J. L.; Montgomery, M. H.; Shipman, H.; WET Team
Pulsations of Pre-White Dwarfs with Hydrogen-dominated Atmospheres	193	Maeda, K.; Shibahashi, H.
The Frequency Stability of the Pulsating White Dwarf L19-2	199	Sullivan, D. J.; Chote, P.
An Update on the Quirks of Pulsating, Accreting White Dwarfs	205	Szkody, P.; Mukadam, A. S.; Gänsicke, B. T.; Hermes, J. J.; Toloza, O.
The Instability Strip of ZZ Ceti White Dwarfs	211	Van Grootel, V.; Fontaine, G.; Brassard, P.; Dupret, M.-A.
SDSS J1618+3854: The Sixth Extremely Low-Mass White Dwarf Pulsator	217	Bell, K. J.; Kepler, S. O.; Montgomery, M. H.; Hermes, J. J.; Harrold, S. T.; Winget, D. E.
Theoretical Modeling of Pulsating Low-mass White Dwarfs	221	Córsico, A. H.; Althaus, L. G.
The Impact of the Uncertainties in the ¹²C(α,γ)¹⁶O Reaction Rate on the Asteroseismology of ZZ Ceti Stars: First Results	225	De Gerónimo, F. C.; Córsico, A. H.; Althaus, L. G.; Romero, A. D.
Asteroseismic Constraints on the Neutrino Magnetic Dipole Moment	229	Córsico, A. H.; Althaus, L. G.; Miller Bertolami, M. M.; Kepler, S. O.; García-Berro, E.
Determination of the Core Composition of ZZ Ceti Stars through Seismic Means	233	Giammichele, N.; Fontaine, G.; Charpinet, S.; Brassard, P.
High-speed Photometric Observations of ZZ Ceti White Dwarf Candidates	237	Green, E. M.; Limoges, M.-M.; Gianninas, A.; Bergeron, P.; Fontaine, G.; Dufour, P.; O'Malley, C. J.; Guvenen, B.; Biddle, L. I.; Pearson, K.; Deyoe, T. W.; Bullivant, C. W.; Hermes, J. J.; Van Grootel, V.; Grosjean, M.
Time Series Spectroscopic and Photometric Observations of the Massive DAV BPM 37093	241	Nitta, A.; Kepler, S. O.; Chené, A.-N.; Koester, D.; Provencal, J. L.; Kleinman, S. J.; Sullivan, D. J.; Chote, P.; Sefako, R.; Kanaan, A.; Romero, A.; Corti, M.; Kilic, M.; Montgomery, M. H.; Winget, D. E.
Amplitude Modulation in the ZZ Ceti Star GD 244	245	Bognár, Zs.; Paparó, M.; Molnár, L.; Plachy, E.; Sódor, Á.
The Puoko-nui Photometers	249	Sullivan, D. J.; Chote, P.; Harrold, S. T.; Winget, D. E.
GW Lib: a Unique Laboratory for White Dwarf Pulsations	253	Toloza, O.; Gänsicke, B. T.; Hermes, J. J.; Townsley, D. M.; Szkody, P.; Beuermann, K.; Bildsten, L.; de Martino, D.; Godon, P.; Henden, A. A.; Hubeny, I.; Knigge, C.; Long, K. S.; Marsh, T. R.; Patterson, J.; Schreiber, M. R.; Sion, E. M.; Zorotovic, M.
A First Look at the Nonadiabatic Properties of Pulsating Accreting White Dwarfs of the GW Lib Type	257	Van Grootel, V.; Fontaine, G.; Brassard, P.; Dupret, M.-A.
Evidence of Resonant Mode Coupling in the Pulsating DB White Dwarf Star KIC 08626021	261	Zong, W.; Charpinet, S.; Vauclair, G.
Part IV. Disks, Dust, and Planets Around White Dwarfs
Evolved Planetary Systems around Very Cool and Old White Dwarfs	267	Hollands, M. A.; Gänsicke, B. T.; Koester, D.
Is the Oxygen-Rich White Dwarf SDSS J1242+5226 Accreting Water-Abundant Debris?	273	Raddi, R.; Gänsicke, B. T.; Koester, D.; Farihi, J.; Hermes, J. J.; Scaringi, S.; Breedt, E.; Girven, J.
Variable Emission from a Gaseous Disc around a Metal-Polluted White Dwarf	279	Wilson, D. J.; Gänsicke, B. T.; Koester, D.; Raddi, R.; Breedt, E.; Southworth, J.; Parsons, S. G.
Limits from the Ongoing Search for Planets Around White Dwarf Stars Using Pulsation Timings	285	Winget, D. E.; Hermes, J. J.; Mullally, F.; Bell, K. J.; Montgomery, M. H.; Williams, S. G.; Harrold, S. T.; Kepler, S. O.; Castanheira, B.; Chandler, D. W.; Winget, K. I.; Mukadam, A. S.; Nather, R. E.
Recognition of the First Observational Evidence of an Extrasolar Planetary System	291	Zuckerman, B.
The Search for Transits Around White Dwarfs	295	Braker, I. P.; Burleigh, M. R.; Lawrie, K. A.; Faedi, F.; Goad, M. R.; West, R. G.
Part V. Fundamental Properties of White Dwarfs
Constraining the Initial-Final Mass Relation with Wide Double White Dwarfs	301	Andrews, J. J.; Agüeros, M. A.; Gianninas, A.; Kilic, M.; Dhital, S.; Anderson, S.
Refining our Knowledge of the White Dwarf Mass-Radius Relation with HST Observations of Sirius-type Binaries	307	Barstow, M. A.; Bond, H. E.; Burleigh, M. R.; Casewell, S. L.; Farihi, J.; Holberg, J. B.; Hubeny, I.
A Detailed Study of CSS 41177: an Eclipsing Double White Dwarf	313	Bours, M. C. P.; Marsh, T. R.; Parsons, S. G.; Copperwheat, C. M.; Dhillon, V. S.; Littlefair, S. P.; Gänsicke, B. T.; Gianninas, A.; Tremblay, P.-E.
Cluster White Dwarfs and the Initial Mass-Final Mass Relation	319	Casewell, S. L.; Dobbie, P. D.
Calibrating the Initial-Final Mass Relationship with White Dwarf Binaries	325	Catalán, S.
Constraints to Post-AGB Evolution Speed and to IFMR Derived from Planetary Nebulae	331	Gesicki, K.; Zijlstra, A. A.
New Insights on the White Dwarf Luminosity and Mass Functions from the LSS-GAC Survey	337	Rebassa-Mansergas, A.; Liu, X.-W.; Cojocaru, R.; Yuan, H.-B.; García–Berro, E.; Torres, S.; Xiang, M.-X.; Huang, Y.
Removing the "Plateau" from Hot White Dwarf Luminosity Functions	343	Krzesinski, J.; Torres, S.; García–Berro, E.
Cool White Dwarfs Selection with Pan-STARRS Proper Motions	347	Lam, M. C.; Hambly, N. C.
The Initial-Final Mass Relation and its Dependence with Metallicity	351	Romero, A. D.; Campos, F.; Kepler, S. O.
Derivation of the Stellar Formation History from White Dwarfs in the Solar Neighborhood	355	Tremblay, P.-E.; Kalirai, J. S.; Soderblom, D. R.; Cignoni, M.; Cummings, J.
Part VI. Properties of White Dwarf Populations, Clusters
A Population Synthesis Study of the MS+WD Population in the SDSS	361	García–Berro, E.; Torres, S.; Camacho, J.; Rebassa–Mansergas, A.; Gänsicke, B. T.; Schreiber, M. R.; Zorotovic, M.
Commentary and Casual Observations on the SDSS DR7 Spectroscopic Sample	367	Holberg, J. B.
Deep Observations of the Open Cluster NGC 6253	373	Jeffery, E. J.
A Population Synthesis Study of the White Dwarf Cooling Sequence of 47 Tucanae	379	Torres, S.; García–Berro, E.; Althaus, L. G.; Miller Bertolami, M. M.
The Blue Turn in the White Dwarf Stars of Globular Clusters	385	Campos, F.; Bergeron, P.; Romero, A. D.; Kepler, S. O.; Bonatto, C. J.; Winget, D. E.; Montgomery, M. H.
A Study of the Effects of Metallicity on the Population of Galactic Disk White Dwarfs	389	Cojocaru, R.; Torres, S.; Isern, J.; García–Berro, E.
White Dwarfs in the Galactic Plane: an Outlook to the Field and Clustered Population	393	Raddi, R.; Catalán, S.; Steeghs, D.; Gänsicke, B. T.; Hermes, J. J.; Drew, J. E.; Mohr-Smith, M.; EGAPS consortium
Part VII. Physical Processes in White Dwarfs
Which Hydrogen Balmer Lines are Most Reliable for Determining White Dwarf Atmospheric Parameters?	399	Falcon, R. E.; Rochau, G. A.; Bailey, J. E.; Gomez, T. A.; Montgomery, M. H.; Winget, D. E.; Nagayama, T.
High Transparency of Photosphere Plasma for Electromagnetic Waves Polarized Across Strong Magnetic Field on White Dwarfs	405	Koryagin, S. A.
Completely Bound Motion of Electrons with Positive Energy near Protons in a Cool White Dwarf Photosphere Plasma with Strong Magnetic Field	411	Koryagin, S. A.; Arsenyev, S. A.
Do the Constants of Nature Couple to Strong Gravitational Fields?	415	Preval, S. P.; Barstow, M. A.; Holberg, J. B.; Barrow, J. D.; Berengut, J. C.; Webb, J. K.; Dougan, D.; Hu, J.
Diffusion Coefficients in White Dwarfs	419	Saumon, D.; Starrett, C. E.; Daligault, J.
Part VIII. Surveys: Results and Prospects
White Dwarf Pulsations in LSST	425	Bell, K. J.; Claver, C. F.; Krughoff, K. S.; Montgomery, M. H.; Mukadam, A. S.; Winget, D. E.
White Dwarfs in HETDEX: Preparation for the Survey	431	Castanheira, B. G.; Winget, D. E.
White Dwarfs in SDSS DR9 and DR10	437	Gentile Fusillo, N. P.; Gänsicke, B.; Koester, D.
White Dwarf Research with Gaia	443	Jordan, S.
New White Dwarfs in the SDSS DR10	449	Kepler, S. O.; Pelisoli, I.; Koester, D.; Ourique, G.; Kleinman, S. J.; Romero, A. D.; Nitta, A.; Eisenstein, D. J.; Costa, J. E. S.; Külebi, B.; Jordan, S.; Dufour, P.; Giommi, P.; Rebassa-Mansergas, A.
Detectability of Substellar Companions Around White Dwarfs with Gaia	455	Silvotti, R.; Sozzetti, A.; Lattanzi, M.; Morbidelli, R.
Using White Dwarfs to Calibrate the Dark Energy Survey	459	Smith, J. A.; Tucker, D. L.; Fix, M. B.; Wester, W. C.; Tremblay, P.-E.; Charbonnier, S.
Future Observations of White Dwarfs from Space	463	Barstow, M. A.; Casewell, S. L.
Part IX. White Dwarfs in Binaries
Testing Common Envelopes on Double White Dwarf Binaries	469	Nandez, J. L. A.; Ivanova, N.; Lombardi Jr., J. C.
The Population of White Dwarf Binaries with Hot Subdwarf Companions	475	Geier, S.; Kupfer, T.; Heber, U.; Barlow, B. N.; Maxted, P. F. L.; Heuser, C.; Schaffenroth, V.; Ziegerer, E.; Østensen, R. H. O.; Gänsicke, B. T.
The Search for the Shortest Period Binary White Dwarfs: The Latest Results from the ELM Survey	481	Gianninas, A.; Kilic, M.; Brown, W. R.; Canton, P.; Hermes, J. J.; Bell, K. J.; Harrold, S. T.
The Formation of Low-mass Helium White Dwarfs in Close Binaries	487	Istrate, A. G.
Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog	493	Liebert, J.; Smith, P. S.; Ferrario, L.; Wickramasinghe, D. T.
Angular Momentum Evolution of V455 Andromedae	495	Mukadam, A. S.; Pyrzas, S.; Townsley, D. M.; Gänsicke, B. T.; Hermes, J. J.; Szkody, P.
Dynamical Masses of Cool White Dwarfs in Double Degenerate Binary Systems	501	Nelan, E. P.; Bond, H. E.; Schaefer, G.
Evolution of Nova TrA 2008 into a High Mass-Accretion Rate Post-Nova	507	Walter, F. M.
Analysis of Eclipses in V1032 Ophiuchi	513	Bkakowska, K.; Olech, A.
Study of Dwarf Novae Outbursts	517	Otulakowska-Hypka, M.; Olech, A.
An Intensive HST/COS Study of 31 CV WDs	521	Pala, A. F.; Gänsicke, B. T.; Beuermann, K.; Bildsten, L.; De Martino, D.; Godon, P.; Henden, A. A.; Hubeny, I.; Knigge, C.; Long, K. S.; Marsh, T. R.; Patterson, J.; Schreiber, M. R.; Sion, E. M.; Szkody, P.; Townsley, D.; Zorotovic, M.
Part X. Central Stars of Planetary Nebulae
When a Couple's Squabbling Leads to Cosmic Bubbles	527	Boffin, H. M. J.
Evolution of the Central Stars of Young Planetary Nebulae	533	Hajduk, M.; van Hoof, P. A. M.; Zijlstra, A. A.
Hydrogen-deficient Central Stars of Planetary Nebulae	539	Todt, H.; Kniazev, A. Y.; Gvaramadze, V. V.; Hamann, W.-R.; Peña, M.; Gräfener, G.; Buckley, D.; Crause, L.; Crawford, S. M.; Gulbis, A. A. S.; Hettlage, C.; Hooper, E.; Husser, T.-O.; Kotze, P.; Loaring, N.; Nordsieck, K. H.; O'Donoghue, D.; Pickering, T.; Potter, S.; Romero-Colmenero, E.; Vaisanen, P.; Williams, T.; Wolf, M.
Part XI. Supernova Progenitors, Supernovae
Hot DQ White Dwarf Stars as Failed Type Ia Supernovae	547	Dunlap, B. H.; Clemens, J. C.
Long Term Modelling of Recurrent Novae Resulting in SNIa	553	Hillman, Y.; Prialnik, D.; Kovetz, A.; Shara, M. M.
A Spherical Chandrasekhar-Mass Delayed-Detonation Model for a Normal Type Ia Supernova	559	Blondin, S.; Dessart, L.; Hillier, D. J.
The Physics and End-Products of Merging CO WD Binaries	563	Zhu, C.
Back Matter
Author Index	569	Dufour, P.; Bergeron, P.; Fontaine, G.
Back Matter	573