2019AstBu..74..490S

Query : 2019AstBu..74..490S

2019AstBu..74..490S - Astrophys. Bull., 74, 490-496 (2019/December-0)

Long-Term Activity of a Little Known Dwarf Nova DT Octantis.

SIMON V. and EDELMANN H.

Abstract (from CDS):

We analyze the long-term activity of a little known dwarf nova (DN) DT Oct. We use photographic observations from the Bamberg Observatory (Southern Patrol Photographic Sky Survey), CCD data from ASAS-3 survey, and AAVSO data (both CCD and visual). We determined the recurrence times of the superoutbursts, TCso, and of the normal outbursts, TCno, to be approximately 311 d and about 30 d, respectively. Although the length of TCso evolves gradually and undergoes only small variations (increases and decreases) of the nearby or neighbouring events (on the timescale of a few epochs), the evolution of TCso displays considerably larger changes on the longer timescales. They suggest a dominant trend of a decrease of TCso on the timescale of tens of years. The possibly magnetized white dwarf does not prevent DT Oct to show the long-term activity of the SU UMa systems. We place the time evolution of the superoutbursts of DT Oct in the context of DNe of various sub-types.A CT + 1 object quotations

Abstract Copyright: ∼

Journal keyword(s): accretion - accretion disks-binaries: close-novae - cataclysmic variables-stars: dwarf novae-circumstellar matter stars - magnetic field-stars - Ae/Be Herbig-stars - statistics

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	V* DT Oct	CV*	18 40 52.4023476744	-83 43 10.001234784						~	38	0

Query : 2019AstBu..74..490S

Basic data :

V* DT Oct -- Cataclysmic Binary

V* (NSV,V*,...), * (GSC2,USNO,...), CV* (2015PASJ), X (1eRASS,1RXS), UV (2012ApJS), NIR (2MASS)

18 40 52.4023476744 -83 43 10.001234784 (Optical) [ 0.0309 0.0311 90 ] A 2020yCat.1350....0G

18 28 16.2245028278 -83 45 38.784140594 [ 0.0309 0.0311 90 ]

309.9559546376105 -26.6641933678354 [ 0.0309 0.0311 90 ]

-0.886 -36.752 [0.056 0.049 90] A 2020yCat.1350....0G

3.5818 [0.0362] A 2020yCat.1350....0G

G 16.277216 [0.018712] C 2020yCat.1350....0G

J 14.442 [0.041] C 2003yCat.2246....0C

H 14.206 [0.054] C 2003yCat.2246....0C

K 14.039 [0.074] C 2003yCat.2246....0C

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`NSV 10934`	`2MASS J18405228-8343099`	`TIC 277074217`	`AAVSO 1815-83`
`1eRASS J184050.8-834309`	`1RXS J184050.3-834305`	`USNO-A2.0 0000-01624640`	`Gaia DR3 6347097928386163072`
`GSC2 S31002132326`	*`SV BV 966`**	*`V DT Oct`**	`Gaia DR2 6347097928386163072`

References (38 between 1850 and 2026) (Total 38)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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`NSV 10934`	`2MASS J18405228-8343099`	`1RXS J184050.3-834305`	`USNO-A2.0 0000-01624640`	*`V DT Oct`**
`Gaia DR3 6347097928386163072`	`Gaia DR2 6347097928386163072`

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