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20 April 2024 |
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1RXS J232953.9+062814: a New SU UMa Dwarf Nova below the Period Minimum | | J.Y. Wei
; X.J. Jiang
; D.W. Xu
; A.Y. Zhou
; J.Y. Hu
; | | Date: |
2 Dec 2001 | | Subject: | astro-ph | | Affiliation: | National Astronomical Observatories, China | | Abstract: | 1RXS J232953.9+062814 was identified as a cataclysmic variable by Wei et al. (1999). Four low-resolution spectra of 1RXS J232953.9+062814 were obtained by using the 2.16-m telescope of the National Astronomical Observatories, in which two of them were at outburst, and the other two were at quiescence. The system is about 16.8 B and 16.5 V at quiescence, and 12.6 B and 12.6 V at outburst. The quiescent spectra were dominated by double-peaked Balmer emissions, which indicates a hydrogen-rich system with a high-inclination accretion disc. MgH and TiO absorption bands appeared in the quiescent spectrum imply a companion with a spectral type of early M dwarf. If we take it as a M0 dwarf, the system is located at a distance of 350 pc with a proper motion velocity 150 km s$^{-1}$. The superhump period of 0.046311 days (Uemura et al. 2001) was confirmed by our V photometry. The short period and the hydrogen-rich nature reveal that this system is another SU Ursae Majoris-type dwarf nova below the period minimum after V485 Centauri. 1RXS J232953.9+062814 is one of the most important systems for studying the evolutionary scenario of cataclysmic variables since it is much brighter than V485 Cen. | | Source: | arXiv, astro-ph/0112014 | | Services: | Forum | Review | PDF | Favorites | |
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