2022AJ....163..246H


Query : 2022AJ....163..246H

2022AJ....163..246H - Astron. J., 163, 246-246 (2022)

Hitting a New Low: The Unique 28 hr Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra).

HILL K.L., LITTLEFIELD C., GARNAVICH P., SCARINGI S., SZKODY P., MASON P.A., KENNEDY M.R., SHAW A.W. and COVINGTON A.E.

Abstract (from CDS):

We present the Transiting Exoplanet Surveying Satellite light curve of the intermediate polar YY Draconis (YY Dra, also known as DO Dra). The power spectrum indicates that while there is stream-fed accretion for most of the observational period, there is a day-long, flat-bottomed low state at the beginning of 2020 during which the only periodic signal is ellipsoidal variation and there is no appreciable flickering. We interpret this low state to be a complete cessation of accretion, a phenomenon that has been observed only once before in an intermediate polar. Simultaneous ground-based observations of this faint state establish that when accretion is negligible, YY Dra fades to g = 17.37 ± 0.12, which we infer to be the magnitude of the combined photospheric contributions of the white dwarf and its red dwarf companion. Using survey photometry, we identify additional low states in 2018-2019 during which YY Dra repeatedly fades to-but never below-this threshold. This implies relatively frequent cessations in accretion. Spectroscopic observations during future episodes of negligible accretion can be used to directly measure the field strength of the white dwarf by Zeeman splitting. Separately, we search newly available catalogs of variable stars in an attempt to resolve the long-standing dispute over the proper identifier of this system.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Cataclysmic variable stars - White dwarf stars - DQ Herculis stars - DQ stars - Accretion - Stellar magnetic fields

Simbad objects: 20

goto Full paper

goto View the references in ADS

Number of rows : 20
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* V515 And CV* 00 55 19.8532324488 +46 12 56.987432856           ~ 41 0
2 2MASS J05243042+4244506 CV* 05 24 30.4643309280 +42 44 50.460570600           ~ 41 0
3 V* TW Pic CV* 05 34 50.5861498896 -58 01 40.765120788 13.84 14.83 15.10     ~ 89 2
4 V* TX Col CV* 05 43 20.1155786784 -41 01 54.309912963   14.5       ~ 153 0
5 V* KR Aur CV* 06 15 43.9189295136 +28 35 08.553579540           ~ 158 0
6 SWIFT J0746.2-1611 CV* 07 46 17.1148913952 -16 11 27.682837656   15.020 14.469 14.830   ~ 19 0
7 V* DW Cnc CV* 07 58 53.0399000904 +16 16 45.169158720           ~ 63 0
8 V* YY Dra EB* 11 43 35 +71 42.2           ~ 35 1
9 V* DO Dra CV* 11 43 38.4921265896 +71 41 20.559036192       13.747   DQ 215 1
10 V* V1025 Cen CV* 12 38 16.3191432264 -38 42 45.836441856   15.20       ~ 74 0
11 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 149 0
12 V* V1323 Her CV* 18 03 39.6647033976 +40 12 20.266898184   17.3   17.2   ~ 23 0
13 SWIFT J183221.5-162724 * 18 32 21.5629981591 -16 27 24.245005329           ~ 4 0
14 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 328 0
15 V* MV Lyr CV* 19 07 16.2886463256 +44 01 07.869892008   13.040 12.920 12.489 12.578 M5Ve 270 0
16 RX J2133.7+5107 CV* 21 33 43.6348450728 +51 07 24.729535560   15.80       ~ 73 0
17 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948           ~ 352 0
18 V* AO Psc CV* 22 55 17.9860863984 -03 10 39.981831564           ~ 304 0
19 V* IP Peg CV* 23 23 08.5362249504 +18 24 59.206884012           M2 375 0
20 GD 1662 CV* 23 29 00.4713595416 -29 46 45.980660100           OBe 159 0

To bookmark this query, right click on this link: simbad:objects in 2022AJ....163..246H and select 'bookmark this link' or equivalent in the popup menu


2023.03.29-21:31:05

© Université de Strasbourg/CNRS

    • Contact