white dwarfs in nova-like variables
DESCRIPTION
WHITE DWARFS IN NOVA-LIKE VARIABLES. Edward M.Sion Department of Astronomy & Astrophysics, Villanova University. Collaborators. Patrick Godon, Villanova University Al Linnell, University of Washington Paula Szkody, University of Washington Ivan Hubeny, University of Arizona - PowerPoint PPT PresentationTRANSCRIPT
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WHITE DWARFS IN NOVA-LIKE VARIABLES
Edward M.Sion
Department of Astronomy & Astrophysics, Villanova University
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Collaborators
• Patrick Godon, Villanova University
• Al Linnell, University of Washington
• Paula Szkody, University of Washington
• Ivan Hubeny, University of Arizona
• Current and Former Villanova Students
Ryan Hamilton, Joel Urban, Trisha Mizusawa, Ronald-Louis Ballouz
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Detection of WDs in Nova-Likes
• Systems (except BK Lyn) Above the Gap
• Luminous Disks
• Outflowing Wind
• Low states relatively rare & shorter than high states
Many nova-likes are viewed at high inclination (obscures WD and BL)
Low Inclination NLs (WD hidden?)
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{BK Lyn }
{V442 Oph}
{KR Aur}
IX Vel
{V3885 Sgr}
VY Scl
{BB Dor}
MV Lyr
DW UMa
TT Ari
V794 Aql
CENSUS of WDs in Nova-Likes
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RW Tri (Mizusawa et al.2009, PASP in preparation)
d = 341 + 38/-41 pc
M_wd = 0.4 Msun, Mdot = 6.3 x 10^-9 Msun/yr
7 Archival IUE Spectra from Feb.1980 to Aug.1982
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KR Aur Mizusawa et al.2009, PASP, in prep.
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V442 Oph Ballouz & Sion, 2009, ApJ, in press
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BB Dor Mdot = 1 x 10^-9 Msun/yr T_wd ~ 32000K (T_wd =37,000K) i = 8 degrees (80 degrees)
Godon et al. 2008, ApJ, 687, 532
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BK Lyn
• VY Scl-type Nova-Like Variable• Only Nova-Like below the Period Gap• P_orb = 108 min• i < 80 degrees; i > 20 degrees• M_wd = 0.3 +0.35 /- 0.12 Msun (Dobrzycka & Howell
1992)• d = 116 to 1.5 kpc?• HST STIS G140L Obs (4/13/03) B.Gaensicke, PI• No P Cygni features, strong emission, sharp LyA• Spectroscopic Twin of V794 Aql (P_orb = 221min)
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BK Lyn Ballouz, Sion, Gaensicke, Long, 2009, in preparation
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Mwd Mdot i chi^2 d (pc) 1.2 -9/-9.5 75-81 1.84-1.9 300-5501.0 -9.0 75-81 1.94 400-7000.8 -8.5 75-81 1.97 560-940 0.55 -8.0 75-81 1.97-2.00 730-12200.40 -8.0 75 2.07 860
BK Lyn Disk Fitting Results
(Ballouz et al. 2009, in preparation)
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V3885 Sgr
• UX UMa-type Nova-Like
• P_orb =
• Luminous Disk, Wind
• Mdot = 5 x 10^-9 Msun/yr
• M_wd = 0.8 Msun
• i = 40 – 60 degrees
• d = 500 pc
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V3885 Sgr
T_wd = 57,000 +/- 5000K
Linnell et al. 2009, ApJ, submitted
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Conclusions
• # of NL WDs with Teff’s slowly increasing
• All (so far) have Teff > 30,000K
• All are hottest WDs at their P_orb
• V3885 Sgr has T_wd = 57,000 +/- 5000K
• We must have TOO program with HST
to Catch NL Systems in Low States