White Dwarfs and Isolated Neutron Stars

Working Group

• Members
  

  Vadim Burwitz (chair, ROSAT, Chandra, XMM,eROSITA)

  Jelle Kaastra (Chandra, Modeling)

  Herman Marshall (Chandra)

  Norbert Schulz (Chandra)

  Jeremy Drake (Chandra)

  Steve Sembay (XMM EPIC-MOS)
  Cor de Vries (XMM RGS)
  Vadim Burwitz (Chandra)
  
  Tadayasu Dotani, Eric Miller (Suzaku)

Isolated Neutron Stars

• Objects
  RX J1856.5-3754
  PSR B0656+14
  
  
• Data RX J1856.5-375

• Instruments:
  • Chandra LETG + ACIS-S / HRC-S
  • XMM  EPIC-pn SW
  • SWIFT
  • Astrosat SXT
  • Hitomi

• eROSITA calibration observations
  
  • 2019 09 13  80ksec to be done
  • 2019 09 24  80ksec to be done
  • 2020 03 11 - 04 22  80ksec after survey #1
• Chandra LETGS+HRC-S observations
  

  •  500ks OBS_IDs: 00113  03380  03381  03382  03399

  • 120ks  OBS_IDs: 14418  15293

  • 172ks  OBS_IDs: 21693 21896 (will be obvserved in the context of eROSITA calibration)

• Chandra LETG + ACIS-S

• Models

RX J1856.5-3754 based on the CHANDRA LETGS + HRCS Data

      delchisqr = 1 ( = 1 sigma for 1 parameter)

• • tbabs*bbodyrad   

    chiqs = 692.6
    dof =1251
    chired = 0.55367
    nh = (7.24 +/- 0.34 ) * 1e19 cm-2
    kT = ( 62.38 +/- 0.38 ) eV
    norm = (1.580 +/- 0.064) * 1e5
    
    

  • phabs*bbodyrad   

    chiqs = 696.0
    dof =1251
    chired = 0.55636
    nh = (7.37 +/- 0.35 ) * 1e19 cm-2
    kT = ( 62.43 +/- 0.38 ) eV
    norm = (1.576 +/- 0.065) * 1e5
    
    
    

White Dwarfs

• Objects
  HZ 43, Sirius B, GD 153

• Missions
  EUVE, ROSAT, Chandra, XMM-Newton

• Data
  • Chandra
    • HZ 43
    • Sirius B
    • GD 153

• Results
  see papers

Papers

• http://cdsads.u-strasbg.fr/abs/2006A%26A...458..541B Beuermann, K., Burwitz, V., Rauch, T. 2006: ''Establishing HZ43 A, Sirius B, and RX J185635-3754 as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPC'', A&A 458,541
• http://cdsads.u-strasbg.fr/abs/2008HEAD...10.0406K Kaastra, J. S., Lanz, T., Hubeny, I., Paerels, F. 2008: ''Establishing HZ43 A, Sirius B, and RX J185635-3754 as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPC'', HEAD 10.0406
• http://cdsads.u-strasbg.fr/abs/2008A%26A...481..807R Rauch, T. 2008, ''Uncertainties in (E)UV model atmosphere fluxes'', A&A 481, 807
• http://cdsads.u-strasbg.fr/abs/2006A%26A...458..541B Kaastra, J. S., Lanz, T.. Hubeny, I.. Paerels, F. B. S. 2009, ''Effective area calibration of the reflection grating spectrometers of XMM-Newton. II. X-ray spectroscopy of DA white dwarfs'', A&A 497, 311

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