k-band observations of sub-gap cataclysmic variables
TRANSCRIPT
![Page 1: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/1.jpg)
K-band Observations of Sub-Gap
Cataclysmic Variables
Ryan T. Hamilton, Thomas E. HarrisonNew Mexico State University
Claus TappertUniversidad de Valparaiso
Steve B. HowellNOAO
217th AAS, Seattle, WA
![Page 2: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/2.jpg)
Motivation
● CV's in 6 words or less:– White dwarf, low-mass dwarf, accretion, boom
● Explanation for 2-3 hr period gap rough● NIR spectra examine secondary directly
– NIR UV connection? CVs with UV CNO →anomaly tend to show weak CO bands...● Need more observations! Have any to share? ☺
– 61 systems with NIR spectra● 19 Pre-CVs, 31 Non-Mag., 11 Mag./IP
![Page 3: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/3.jpg)
OriginalsOriginals
![Page 4: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/4.jpg)
Fit continuum, raise to an exponentFit continuum, raise to an exponent
OriginalsOriginals
'Stretches''Stretches'
![Page 5: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/5.jpg)
![Page 6: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/6.jpg)
![Page 7: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/7.jpg)
![Page 8: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/8.jpg)
Thesis Work● Short period systems normal
– Pre-CV/Magnetic systems appear normal too
● Long period systems strange – 13/19 show weak/absent CO features (~70%)– Some enhanced 13CO (Harrison et al. 2005)
● Synthetic spectra to play with– Weak CO low C abundance?→– PHOENIX & MOOG modeling
![Page 9: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/9.jpg)
Thesis Work● Short period systems normal
– Pre-CV/Magnetic systems appear normal too
● Long period systems strange – 13/19 show weak/absent CO features (~70%)– Some enhanced 13CO (Harrison et al. 2005)
● Synthetic spectra to play with– Weak CO low C abundance?→– PHOENIX & MOOG modeling
![Page 10: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/10.jpg)
Thesis Work● Short period systems normal
– Pre-CV/Magnetic systems appear normal too
● Long period systems strange – 13/19 show weak/absent CO features (~70%)– Some enhanced 13CO (Harrison et al. 2005)
● Synthetic spectra to play with– Weak CO low C abundance?→– PHOENIX & MOOG modeling
μ Aql vs. MOOG Modelμ Aql vs. MOOG Model
PHOENIX Nextgen M DwarfPHOENIX Nextgen M Dwarf
![Page 11: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/11.jpg)
Thanks!
Our paper is available! ApJ soon and arXiv now:
arXiv:1012.1368
Special thanks to K. Cunha, V. Smith, and E. Sion for all their helpful
discussions!
R.T. Hamilton, T.E. Harrison, C. Tappert, S.B.
Howell
http://astronomy.nmsu.edu/rthamilt/conferences
![Page 12: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/12.jpg)
Extra Slides
![Page 13: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/13.jpg)
Knigge Comparison
![Page 14: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/14.jpg)
Comparison Colors
![Page 15: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/15.jpg)
Big List (PreCV, NonMag)
![Page 16: K-band Observations of Sub-Gap Cataclysmic Variables](https://reader031.vdocument.in/reader031/viewer/2022020916/61a395cee3fb41068f504bff/html5/thumbnails/16.jpg)
Big List (Magnetics)