2012A&A...539A.153P


Query : 2012A&A...539A.153P

2012A&A...539A.153P - Astronomy and Astrophysics, volume 539A, 153-153 (2012/3-1)

Period changes of the long-period cataclysmic binary EX Draconis.

PILARCIK L., WOLF M., DUBOVSKY P.A., HORNOCH K. and KOTKOVA L.

Abstract (from CDS):

The cataclysmic variable star EX Dra is a relatively faint but frequently investigated eclipsing dwarf nova. In total 35 new eclipses were measured photometrically as part of our long-term monitoring of interesting eclipsing systems. Using published and new mid-eclipse times obtained between 2004 and 2011 we constructed the observed-minus-calculated diagram. The current data present 21 years of period modulation with a semi-amplitude of 2.5 min. The eclipse timings show significant deviations from the best sinusoidal fit, which indicates that this ephemeris is not a complete description of the data. The fractional period change is roughly ΔP/P=3x10–6.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: eclipsing - stars: dwarf novae - stars: individual: EX Draconis - novae, cataclysmic variables

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* HT Cas CV* 01 10 13.1213394144 +60 04 35.489642700     14.10     M5.5e 379 0
2 V* RW Tri CV* 02 25 36.1556820000 +28 05 50.891220600   13.50 12.50     M0V 300 0
3 V* UZ For CV* 03 35 28.6518733656 -25 44 21.768755424           M4.5 258 0
4 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 325 0
5 V* T Aur No* 05 31 59.1180488976 +30 26 45.034081044           ~ 270 0
6 V* V470 Cam HS* 07 10 42.0513241680 +66 55 43.521505680           sdB+dM 105 1
7 V* U Gem CV* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1084 0
8 V* Z Cha CV* 08 07 27.7517751528 -76 32 00.665029356           M5.5 602 1
9 V* AC Cnc CV* 08 44 27.1121665272 +12 52 31.995783264   13.80 14.15     K1-3V 132 0
10 V* OY Car CV* 10 06 22.0793274312 -70 14 04.584660540           ~ 560 0
11 V* DP Leo CV* 11 17 15.9239894616 +17 57 41.690453220           ~ 221 1
12 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 274 1
13 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 682 0
14 V* UX UMa CV* 13 36 40.9531256400 +51 54 49.423353228   12.78 13.26     sdOB 515 0
15 V* QS Vir EB* 13 49 52.0029035208 -13 13 37.000132212 14.27 14.98 14.40 14.37   DA3+dM 129 1
16 V* NN Ser CV* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 261 0
17 V* V2051 Oph CV* 17 08 19.0873634976 -25 48 31.704262776   17.5       ~ 238 0
18 GSC 04429-01551 * 18 03 48.4450660632 +67 54 40.810971024   14.6       ~ 1 0
19 GSC 04429-01414 * 18 03 59.2841876208 +67 52 51.119692320   14.4 14.4     ~ 1 0
20 V* EX Dra CV* 18 04 14.2486747659 +67 54 12.271788519   14.5 14.7     ~ 122 0
21 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 993 1
22 V* EM Cyg CV* 19 38 40.1068970904 +30 30 28.332591012     11.90     ~ 249 0
23 V* V4140 Sgr CV* 19 58 49.7019378552 -38 56 13.224023700           ~ 67 0
24 HS 2231+2441 HS* 22 34 21.4832585640 +24 56 57.392918196     14.20     sdB+dM 47 1
25 V* IP Peg CV* 23 23 08.5362249504 +18 24 59.206884012           M2 373 0

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2023.02.04-11:00:12

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