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Activity on Magnetic CV Secondaries: Nature or Nurture?

Activity on Magnetic CV Secondaries: Nature or Nurture?. Stella Kafka Spitzer Science Center / Caltech. R.K. Honeycutt (IU), C. Tappert (UC), T. Ribeiro (UFSC), S. Howell (NOAO), D.W Hoard (SSC/Caltech). Wild stars in the old west II - Tucson 2009. Magnetic CVs - Secondary Star.

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Activity on Magnetic CV Secondaries: Nature or Nurture?

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  1. Activity on Magnetic CV Secondaries:Nature or Nurture? Stella Kafka Spitzer Science Center / Caltech R.K. Honeycutt (IU), C. Tappert (UC), T. Ribeiro (UFSC), S. Howell (NOAO), D.W Hoard (SSC/Caltech) Wild stars in the old west II - Tucson 2009

  2. Magnetic CVs - Secondary Star • Late K/M V • Survive common envelope phase & nova explosions • M-dot ~ 10-11-10-9 M¤/yr • P<7h • Magnetically active Animation: A. Beardmore

  3. MDI, SOHO, ESA, NASA Vacuum Tower Telescope, NSO, NOAO TRACE Project, NASA Stellar Activity: our Sun

  4. AB Dor EV Lac – Flare M3-inactive M3-active Hα Wavelength (Å) Stellar activity in field stars Strassmeier, K.

  5. SS Cyg V Mag. BY Cam JD-2448400 Data: RoboScope (Honeycutt 1990-2005) Consequences of activity • Disrupted magnetic braking (eg Ritter 1985; Taam & Spruit 1989; Hameury 1991) • Long-term lc modulations (eg Bianchini 1987, 1988; Warner 1988; Ak et al 2001) Animation: A. Beardmore

  6. Consequences of activity • Disrupted magnetic braking (eg Ritter 1985; Taam & Spruit 1989; Hameury 1991) • Long-term lc modulations (eg Bianchini 1987, 1988; Warner 1988; Ak et al 2001) • Dwarf nova outburst periodic behavior (eg Meyer-Hofmeister, Vogt & Meyer 1996) • VY Scl low states (Livio & Pringle 1994; Kafka & Honeycutt 2005) Animation: A. Beardmore

  7. AM Her: 1990 - 2008 Shakhovskoy et al. 1993 V Mag. JD - 2448200 Kafka et al. 2006, 2007, 2008 - data: RoboScope & AAVSO

  8. KPNO 2m WIYN 3.5m WIYN 3.5m MMT 6.5m V Mag. JD - 2448200. AM Her: 1990 - 2008 V Mag. JD - 2448200 Kafka et al. 2006, 2007, 2008 - data: RoboScope & AAVSO

  9. AM Her Spectrum F (ergs/cm2/sec/Å)*10-15 Wavelength (Å) Kafka et al. 2008

  10. Sept 2006 Wavelength (Å) Hα trailed spectrum

  11. Hα doppler map vy (km/sec) vx (km/sec)

  12. Sept 2006 Wavelength (Å) Hα- satellites • Secondary’s side of CM • Same shape & curvature • Visible for ½ phase • Resemble partial ring around the secondary • Structure • Persistent Magnetic Activity (“Prominences”) Kafka et al. 2008

  13. VV Pup ST LMi RV (km/sec) F (ergs cm-2 s-1Å-1) RV (km/sec) Relative Intensity Phase Phase Other systems* *Also see poster #35 by Howell et al. Kafka et al. 2007 Mason, E. et al. 2008

  14. Magnetic activity on CV donor stars: Nature or Nurture? ? ? Artwork: A. Beardmore

  15. SDSS J204827.9+005008.9Low Accretion Rate Polar(LARP) WD (0.6Msun) + M3 P~4h counts M-dot ~ 6*10-14Msun/year (Schmidt et al. 2005) Wavelength (Å) Kafka et al. 2009, in prep.

  16. SDSS J204827.9+005008.9Low Accretion Rate Polar(LARP) WD (0.6Msun) + M3 P~4h counts Wavelength (Å) Wavelength (Å) Kafka et al. 2009, in prep.

  17. AM Her vs J2048 vy (km/sec) vy * 103(km/sec) vx * 103(km/sec) vx (km/sec) M-dot: 10-12Msun/year (low state) 6*10-14Msun/year

  18. Magnetic activity on CV donor stars: Nature or Nurture? ? ? Artwork: A. Beardmore Artwork: P. Marenfeld (NOAO/NSF)

  19. Conclusions: • Direct detection of (induced) magnetic structures on the donor star of magnetic CVs • Grounds for modeling ? AM Her SDSS J2048

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