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Activity on Magnetic CV Secondaries: Nature or Nurture? Stella Kafka Spitzer Science Center / Caltech Stella Kafka Spitzer Science Center / Caltech Wild.

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Presentation on theme: "Activity on Magnetic CV Secondaries: Nature or Nurture? Stella Kafka Spitzer Science Center / Caltech Stella Kafka Spitzer Science Center / Caltech Wild."— Presentation transcript:

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

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

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

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

5 JD Data: RoboScope (Honeycutt ) SS Cyg BY Cam V Mag. 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 Animation: A. Beardmore 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)

7 AM Her: JD V Mag. Shakhovskoy et al Kafka et al. 2006, 2007, data: RoboScope & AAVSO

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

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

10 Wavelength (Å) Sept 2006 H α trailed spectrum

11 H α doppler map v x (km/sec) v y (km/sec)

12 H α - 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 Wavelength (Å) Sept 2006

13 Other systems* *Also see poster #35 by Howell et al. Phase RV (km/sec) Relative Intensity ST LMi VV Pup Phase RV (km/sec) F (ergs cm -2 s -1 Å -1 ) AM HerST Lmi (Kafka et al. 2007) VV Pup (Mason, E. et al. 2008) EF Eri (Kafka et al. in prep) P orb (h) Donor star M4-M5M8 L4?? B (MG) / Kafka et al Mason, E. et al. 2008

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

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

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

17 AM Her vs J2048 v x (km/sec) v y (km/sec) v x * 10 3 (km/sec) v y * 10 3 (km/sec) M-dot: M sun /year (low state) 6* M sun /year

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

19 Conclusions: Direct detection of (induced) magnetic structures on the donor star of magnetic CVs Grounds for modeling SDSS J2048AM Her ?


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