EDP Sciences
Free access
Issue
A&A
Volume 396, Number 2, December III 2002
Page(s) 629 - 632
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021519


A&A 396, 629-632 (2002)
DOI: 10.1051/0004-6361:20021519

Research Note

Is KT Mon a classical nova?

T. Kato1 and H. Yamaoka2

1  Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
2  Faculty of Science, Kyushu University, Fukuoka 810-8560, Japan

(Received 23 September 2002 / Accepted 15 October 2002 )

Abstract
KT Mon has been considered as a classical nova in 1942 based on its light curve and spectroscopy. However, we noticed a unusual feature for a nova soon after its maximum: the early presence of high excitation emission lines such as HeII and NIII. We propose previously overlooked interpretations that KT Mon can be either a WZ Sge-type dwarf nova and an X-ray transient, although the possibility of an unusual or a recurrent nova is not completely excluded. If KT Mon is a WZ Sge-type dwarf nova, the system is expected to have a brown dwarf secondary. If KT Mon is an X-ray transient, the system is a good candidate for the nearest black-hole binary. Within our knowledge, the observed features seem to more strongly support the latter possibility. In all possibilities, we can expect a recurrent outburst in meaningfully near future.


Key words: accretion, accretion disks -- novae, cataclysmic variables -- stars: dwarf novae -- X-rays: bursts -- stars: individual: KT Mon

Offprint request: T. Kato, tkato@kusastro.kyoto-u.ac.jp

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