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J-, H-, and K-band Spectra of Three SU UMa-Type Dwarf Novae

Published online by Cambridge University Press:  09 August 2007

Ryoko Ishioka ,
Kazuhiro Sekiguchi  and
Hiroyuki Maehara
Ryoko Ishioka
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720, USA
Kazuhiro Sekiguchi
Affiliation:
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720, USA
Hiroyuki Maehara
Affiliation:
VSOLJ, Namiki 1-13-4, Kawaguchi, Saitama 332-0034, Japan email: ishioka@subaru.naoj.org
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Abstract

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We present the results of J-, H-, and K-band spectroscopy on three SU UMa-type dwarf novae with orbital periods of 1.33 – 1.37 hr. We performed the SED fitting for the obtained spectra by assuming a power-law distribution for the accretion disk and using template spectra of late-type dwarfs for secondary star. ASAS 002511+1217.2 and EQ J183926+260409 are WZ Sge-type or WX Cet-type dwarf novae. We found strong water absorption features in their spectra, which are characteristic in late M- or L-type dwarfs. The SED fitting suggests that their secondary contributions to the overall SED are less than one third. We identified the secondary stars as M9 and L1 type dwarfs, which are rather less massive but still normal stars. The spectrum of SDSS J013701−091235 is dominated by the secondary component. Spectral features of this object are similar to those of an early M-type dwarf in spite of its short orbital period. The spectrum of SDSS 0137 strongly suggests that the evolutionary path of this object is different from that of ordinary CVs, and this object is a candidate of EI Psc-like systems.

Keywords

stars: dwarf novaebinaries: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 547 - 549
Copyright
Copyright © International Astronomical Union 2007

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