- DM Lyrae
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DM Lyrae A/B Observation data
Epoch J2000.0 Equinox J2000.0Constellation Lyra Right ascension 18h 58m 44.43s Declination +30° 15′ 33.0″ Apparent magnitude (V) +18 (quiet), +13.6 (burst) Characteristics Spectral type ? / White dwarf Variable type SU UMa Other designations DM Lyr, AN 250.1929, 1RXS J185845.1+301548, AAVSO 1854+30DM Lyrae (DM Lyr for short) is a dwarf nova in the constellation Lyra. This binary system is composed of a primary star of unknown type, and a white dwarf companion. It erupted in 1928 and 1996 and reached about magnitude 13. Due to its position, coverage of the star by major northern hemisphere observatories is difficult during the winter months and very difficult by major southern hemisphere observatories all year round; it is quite possible that several outbursts have been missed.
The July 1996 outburst—unlike the others—proved to be a long, bright one, which caused several observers to wonder if it could possibly be a supermaximum which is indicative of a SU Ursae Majoris star. Observers at Kyoto University carried out V band CCD photometry with the 60 cm reflector and detected superhumps of 0.1 mag amplitude, thus reclassifying DM Lyrae as an SU UMa star. Their preliminary period analysis gave 0.066 ± 0.002 days as the best estimated superhump period.
See also
External links
- "DM Lyr: A new UGSU Star". http://www.britastro.org/vss/00516a.html. Retrieved June 22, 2006.
- "DM Lyr". VSNET. http://www.kusastro.kyoto-u.ac.jp/vsnet/gcvs2/LYRDM.html. Retrieved June 22, 2006.
- D. Nogami, H. Baba, K. Matsumoto, and T. Kato. "The SU UMa Nature of the Dwarf Nova, DM Lyrae". arXiv:astro-ph/0301036.
Categories:- Lyra constellation
- Dwarf novae
- Variable star stubs
- Multiple star stubs
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