Title: Hot Subdwarf Stars and Related Objects
Volume: 392 Year: 2008 View this Volume on ADS
Editors: Heber, Ulrich; Jeffery, C. Simon; Napiwotzki, Ralf
These are the proceedings of the third international workshop on Hot Subdwarf Stars and Related Objects, held in the historic city of Bamberg, Germany, in July 2007.

Hot Subdwarfs represent several stages in the very late evolution of low-mass stars. B-type subdwarfs are helium-core burners at the extreme end of the horizontal branch, while O types represent a rich mixture of post-giant branch, post-horizontal branch and post-asymptotic giant branch stars. They are important for many fields of modern astrophysics. Hot subdwarf stars provide:

• The UV light of old unresolved populations, such as giant elliptical galaxies, which may be used to measure their ages
• laboratories to study plasma processes in high-gravity atmospheres, including radiatively-driven atomic diffusion and its consequences for the chemical composition of the star’s outer layers.
• laboratories to study close binary evolution. Many have invisible companions, mostly white-dwarf mergers, while one has a planet, and others may have neutron-star or black-hole companions
• laboratories for asteroseismology. Pulsations check the evolution models by giving direct measurements of mass and radius, and the potential to explore other internal properties.

New instruments and theoretical models, as well as a vibrant young research community, are forcin rapid progress in all of these areas. These proceedings provide and informative snapshot of current research. They also include a small number of papers which have been extended to include an introduction for non-specialists. These papers offer a valuable resource useful to a wide audience including beginning graduate students and experienced reviewers for several years to come.

ISBN: 978-1-58381-654-7 eISBN: 978-1-58381-655-4

Paper Title Page Authors
Volume 392 Cover Heber, U.; Jeffery, C.S.; Napiwotzki, R.
Front Matter   
Volume 392 Front Matter 1 Heber, U.; Jeffery, C.S.; Napiwotzki, R.
Conference Photo   
Volume 392 Conference Photograph 2 Heber, U.; Jeffery, C.S.; Napiwotzki, R.
Part 1.
Hot Subdwarfs in Galaxies and Globular Clusters
The Current Understanding on the UV Upturn 3 Yi, S.K.
Hot Subdwarfs in Binaries as the Source of the Far-UV Excess in Elliptical Galaxies* 15 Podsiadlowski, P.; Han, Z.; Lynas-Gray, A.E.; Brown, D.
Binaries among Extreme Horizontal Branch Stars in Globular Clusters 27 Moni Bidin, C.; Catelan, M.; Villanova, S.; Piotto, G.; Altmann, M.; Momany, Y.; Moehler, S.
The UV Spectrum of the Galactic Bulge 39 Busso, G.; Moehler, S.
New Views of the Hot Horizontal Branch in ω Centauri 47 Moehler, S.; Dreizler, S.; Lanz, T.; Bono, G.; Sweigart, A.V.; Calamida, A.; Monelli, M.; Nonino, M.
Variability of EHB Stars in the Globular Cluster NGC 6752 55 Kaluzny, J.; Thompson, I.
An Eclipsing “Blue Straggler” V228 from 47 Tuc: Evolutionary Consideration 59 Sarna, M.J.
Part 2.
Atmospheres and Evolution
Helium and the Hot Horizontal Branch 67 O'Toole, S.J.
Systematics of Hot Subdwarfs Obtained from a Large Low Resolution Survey 75 Green, E.M.; Fontaine, G.; Hyde, E.A.; For, B.-Q.; Chayer, P.
Binary Population Synthesis and sdB Stars at Different Metallicities 83 Brown, D.
Diffusion Calculations in the Atmospheres of Subdwarf B Stars 87 Behara, N.T.; Jeffery, C.S.
The Mass Loss Rates of sdB Stars 95 Unglaub, K.
A New Determination of Abundances for the Subdwarf B Star HD 4539 109 Sale, S.E.; Schoenaers, C.; Lynas-Gray, A.E.
Evolutionary and Observational Constraints on PG 1336−018 (NYVir) 117 Hu, H.; Vuckovic, M.; Østensen, R.; Nelemans, G.; Aerts, C.; Groot, P.J.
An Abundance Analysis of Pulsating and Non-Pulsating Subluminous B Stars: Preliminary Results 123 Pereira, C.; Jeffery, C.S.
Hot Subdwarfs from SDSS and SPY 131 Hirsch, H.A.; Heber, U.; O’Toole, S.J.
The Origin of Subdwarf O Stars 139 Napiwotzki, R.
Meet the COG’s 151 Altmann, M.; Catelan, M.; Zoccali, M.
Metal Abundances of Subdwarf B Stars from SPY – a Pattern Emerges 159 Geier, S.; Heber, U.; Napiwotzki, R.
Model Spectra of Hot Subdwarfs for the Gaia Mission 163 Hindson, L.; Napiwotzki, R.; Heber, U.; Lemke, M.
Hypervelocity Stars: Young and Heavy or Old and Light? 167 Heber, U.; Hirsch, H.A.; Edelmann, H.; Napiwotzki, R.; O’Toole, S.J.; Brown, W.; Altmann, M.
Searching for Hyper-Velocity Stars 175 Tillich, A.; Heber, U.; Hirsch, H.A.
Part 3.
SuperWASP Lightcurves of Subdwarf Stars 179 Maxted, P.F.L.; Norton, A.J.; West, R.G.; Copperwheat, C.; Marsh, T.R.
HW Vir’s Companion: an M-type Dwarf, or maybe a Giant Rotating Spherical Mirror? 187 Edelmann, H.
FUV Spectroscopy of the sdOB Primary of the Eclipsing Binary System AA Dor 195 Fleig, J.; Rauch, T.; Werner, K.; Kruk, J.W.
Orbital Effects in VLT–UVES Spectra of AADor and NYVir 199 Vuckovic, M.; Østensen, R.; Bloemen, S.; Decoster, I.; Aerts, C.
KBS 13 – a Rare Reflection Effect sdB Binary with an M Dwarf Secondary 203 For, B.-Q.; Edelmann, H.; Green, E.M.; Drechsel, H.; Nesslinger, S.; Fontaine, G.
Binary sdB Stars with Massive Compact Companions 207 Geier, S.; Karl, C.; Edelmann, H.; Heber, U.; Napiwotzki, R.
The Subdwarf B+Giant Planet System V391 Peg: Different Scenarios for its Previous Evolution 215 Silvotti, R.
HS 2231+2441: An Eclipsing sdB Binary with a Substellar Companion 221 Østensen, R.H.; Oreiro, R.; Hu, H.; Drechsel, H.; Heber, U.
Radial Velocity Variable sdO/Bs from SPY – Preliminary Orbits of Three New Short Period Binaries 225 Geier, S.; Heber, U.; Napiwotzki, R.
Part 4.
Pulsating sdB/O Stars
Achievements and Challenges in the Field of sdB Asteroseismology 231 Fontaine, G.; Brassard, P.; Charpinet, S.; Green, E.M.; Chayer, P.; Randall, S.K.; Van Grootel, V.
Improved Opacities and Pulsation Models for sdB and sdO Stars 245 Jeffery, C.S.; Saio, H.
Spectroscopic Mode Identification in Slowly-Pulsating Subdwarf B Stars 253 Schoenaers, C.; Lynas-Grey, A.E.
Improved Models of sdB Stars and the Case of PG0014+067 261 Brassard, P.; Fontaine, G.
Time-Resolved High-Resolution Spectroscopy of the Bright sdBV Balloon 090100001 265 Telting, J.H.; Østensen, R.H.; Geier, S.; Heber, U.; Glowienka, L.; Nielsen, T.; Frandsen, S.
Results for Three-Season Photometry of Balloon 090100001 273 Baran, A.; Oreiro, R.; Pigulski, A.; Pérez Hernández, F.; Ulla, A.; Reed, M.D.
Comparing the Observed Frequencies of Balloon 09010001 with Theoretical Modes of Oscillation 277 Oreiro, R.; Baran, A.; Pérez Hernández, F.; Ulla, A.; Pigulski, A.
Asteroseismic Solutions for the Two Fast Subdwarf B Pulsators Balloon 090100001 and PG 1336−018 285 Charpinet, S.; Van Grootel, V.; Brassard, P.; Fontaine, G.; Green, E.M.; Randall, S.K.; Chaye, P.
Multisite Multicolour Photometric Observations of the Nonradially Pulsating SdB Star Balloon 090100001: A White Light Frequency Analysis 293 Pereira, C.; Jeffery, C.S.; Fontaine, G.; Charpinet, S.; Aerts, C.; Ahmad, A.; Connolly, E.; Vuckovic, M.; Dhillon, V.S.; Marsh, T.R.
Constraints on Seismic Models of Balloon 090100001 through High-Sensitivity Multicolour Photometry 297 Charpinet, S.; Fontaine, G.; Brassard, P.; Randall, S.K.; Van Grootel, V.; Green, E.M.; Chayer, P.
Time Resolved Spectroscopy of Balloon 090100001: Observations and Modelling of Variations in Atmospheric Parameters 301 Østensen, R.H.; Telting, J.H.; Heber, U.; Jeffery, C.S.
An Asteroseismological Study of the Rapidly Pulsating Subdwarf B Star PG 0911+456 309 Randall, S.K.; Green, E.M.; Van Grootel, V.; Fontaine, G.; Brassard, P.; Charpinet, S.
An Asteroseismological Analysis of the Pulsating B Subdwarf Feige 48 Taking into Account Rotation 317 Van Grootel, V.; Charpinet, S.; Fontaine, G.; Brassard, P.; Green, E.M.; Chayer, P.
Towards Asteroseismology of the Multiperiodic Pulsating Subdwarf B Star PG1605+072 327 Tillich, A.; Heber, U.; O’Toole, S.J.; Østensen, R.; Schuh, S.
High Speed Photometry for BUSCA 335 Cordes, O.; Reif, K.
Light Curve Analysis of the Hybrid SdB Pulsators HS 0702+6043 and HS 2201+2610 339 Lutz, R.; Schuh, S.; Silvotti, R.; Dreizler, S.; Green, E.M.; Fontaine, G.; Stahn, T.; Hügelmeyer, S.D.; Husser, T.-O.
Simultaneous Time-Series Spectroscopy and Photometry of PG 1219+534 (KY UMa) 343 Reed, M.D.; Eggen, J.R.; Harms, S.L.; Zhou, A.-Y.; VanWey, R.L.; Telting, J.H.; Østensen, R.H.; O’Toole, S.J.; Terndrup, D.M.
A Search for EHB Pulsators in the Globular Cluster NGC 6752 347 Catelan, M.; Prieto, G.E.; Zoccali, M.; Weidner, C.; Stetson, P.B.; Moni Bidin, C.; Altmann, M.; Smith, H.A.; Pritzl, B.J.; Borissova, J.; De Medeiros J.R.
Follow-up Observations of 23 EC14026 Pulsators: Data in Search of an Interpretation 351 Reed, M.D.
Small Frequency Spacings in the Pulsation Spectra of sdB Stars: Two Years Later 359 Fontaine, G.; Brassard, P.; Charpinet, S.
Stability Analyses of sdO Stars 363 Rodríguez–López, C.; Garrido, R.; Moya, A.; MacDonald, J.; Ulla, A.
The First Extensive Search for sdO Pulsators 371 Rodríguez-López, C.; Ulla, A.; Garrido, R.
Part 5. Conference Summary   
Hot Subdwarfs in Bamberg 379 Warner, B.
Back Matter   
Volume 392 Back Matter 385 Heber, U.; Jeffery, C.S.; Napiwotzki, R.
Modeling the Pulsating sdB Star PG 1605+072 387 van Spaandonk, L.; Fontaine, G.; Brassard, P.; Aerts, C.
Volume 392 Photographs 999 Heber, U.; Jeffery, C.S.; Napiwotzki, R.