sdB star research

1
sdB star research

• Armagh Observatory 2007

2
Overview

• Classification
• Stellar Atmospheres
• Asteroseismology
• Evolution
• Binaries
• Oddballs

3
Classification cwr/csj/jsd

• Drilling classification scheme
• Neural net classification
• SDSS DR5

4
Stellar Atmospheres

• SterneOS / Sterne_diff / Spectrum
• Model spectra for GAIA
• SDSS DR5
• FUVUVOptical abundances
• Individual stars Balloon, LS IV-14 .
• sdBs with stratified atmospheres
• Magnetic fields ?
• Spots ?

5
Asteroseismology cap/aa/csj

• Balloon 09010001
• Feige48
• sdO star (2007) (aa, mv, )
• PB8783 (2007)
• BHBs (cap, cwr, )
• Nonadiabatic lpv models
• Nonlinear pulsation models

6
Asteroseismology Balloon 09010001

• Photometry periods -- cap
• Mode identification -- gf
• Asteroseismology -- sc
• Abundances -- csj ro
• Nonlinear models -- csj / pmr? (l1?)

7
Asteroseismology Feige 48

• Velocities
• Bruce/kylie simulations - csj

8
Asteroseismology PB8783 (2007)

• Ultracam observations ?
• WHT ISIS spectroscopy ?

9
Evolution

• Smk
• Hybrid mergers (CO/He He)

10
Binaries

• SPY SB2s
• Shifter companions

11
Oddballs

• BW Vul (? Cepheid)
• BI Lyn (HdB/sdB ??)
• PG1544488

12
3rd Conf. Bamberg 2007

• Ahmad
• Poster - LS IV-14 116 analysis
• Poster - very deep images of sdB stars
• Poster - Feige 48 ?

13
Papers

• PG1336-018