A New Sub-Period-Minimum Cataclysmic Variable With Partial Hydrogen Depletion And Evidence Of Spiral Disk Structure

dc.contributor.utaustinauthorVinko, J.en_US
dc.creatorLittlefield, C.en_US
dc.creatorGarnavich, P.en_US
dc.creatorApplegate, A.en_US
dc.creatorMagno, K.en_US
dc.creatorPogge, R.en_US
dc.creatorIrwin, J.en_US
dc.creatorMarion, G. H.en_US
dc.creatorVinko, J.en_US
dc.creatorKirshner, R.en_US
dc.description.abstractWe present time-resolved spectroscopy and photometry of CSS 120422:111127+571239 (=SBS 1108+574), a recently discovered SU UMa-type dwarf nova whose 55 minute orbital period is well below the cataclysmic variable (CV) period minimum of similar to 78 minutes. In contrast with most other known CVs, its spectrum features He I emission of comparable strength to the Balmer lines, implying a hydrogen abundance less than 0.1 of long-period CVs-but still at least 10 times higher than that in AM CVn stars. Together, the short orbital period and remarkable helium-to-hydrogen ratio suggest that mass transfer in CSS 120422 began near the end of the donor star's main-sequence lifetime, meaning that this CV is a strong candidate progenitor of an AM CVn system as described by Podsiadlowski et al. Moreover, a Doppler tomogram of the Ha line reveals two distinct regions of enhanced emission. While one is the result of the stream-disk impact, the other is probably attributable to spiral disk structure generated when material in the outer disk achieves a 2:1 orbital resonance with respect to the donor.en_US
dc.description.sponsorshipNSF AST-1211196, AST-9987045en_US
dc.description.sponsorshipDepartment of Physics at the University of Notre Dameen_US
dc.description.sponsorshipNSF Telescope System Instrumentation Program (TSIP)en_US
dc.description.sponsorshipOhio Board of Regentsen_US
dc.description.sponsorshipOhio State University Office of Researchen_US
dc.identifier.citationLittlefield, C., P. Garnavich, A. Applegate, K. Magno, R. Pogge, J. Irwin, G. H. Marion, J. Vinkó, and R. Kirshner. >A New Sub-period-minimum Cataclysmic Variable with Partial Hydrogen Depletion and Evidence of Spiral Disk Structure.> The Astronomical Journal, Vol. 145, No. 6 (Jun., 2013): 145.en_US
dc.relation.ispartofserialAstronomical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectnovae, cataclysmic variablesen_US
dc.subjectstars: dwarf novaeen_US
dc.subjectstars: evolutionen_US
dc.subjectstars: individual (css 120422:111127+571239, sbs 1108+574)en_US
dc.subjectam cvn starsen_US
dc.subjectaccretion disksen_US
dc.subjectdwarf novaen_US
dc.subjectorbital perioden_US
dc.subjectclose binariesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleA New Sub-Period-Minimum Cataclysmic Variable With Partial Hydrogen Depletion And Evidence Of Spiral Disk Structureen_US

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