2022A&A...657A.101B


Query : 2022A&A...657A.101B

2022A&A...657A.101B - Astronomy and Astrophysics, volume 657A, 101-101 (2022/1-1)

J1832.4-1627, the first eclipsing stream-fed intermediate polar.

BEUERMANN K., BREITENSTEIN P. and SCHWAB E.

Abstract (from CDS):

We present a photometric study of the newly discovered eclipsing intermediate polar J183221.56-162724.25 (in short J1832) with an orbital period of 8.87 h. The system features a box-like deep eclipse with a full width at 50% depth of 1970 ±2 s and a large-amplitude coherent pulsation with Pobs = 65.18 min, which represents either the synodic (beat) period or the spin period of the white dwarf (WD). The period ratio is either Pspin/Porb = 0.1091 or 0.1225, respectively. The eclipsed light originates almost entirely from the two accretion spots and columns on the WD, with characteristics indicative of pole flipping. There is no evidence for an accretion disk, and we identify J1832 as the first deeply eclipsing stream-fed intermediate polar. Our grizy photometry in eclipse yielded an i-band AB magnitude of the Roche-lobe-filling secondary star of 18.98(3), an extinction E_B - V_ = 0.54 ±0.17, and a spectral type ∼K6. Dynamic models, fitting the photometry, limit the distance to between 1270 and 2500 pc for masses of the secondary star, M2, between 0.16 and 1.0 M, well within the Gaia EDR3 confidence limits. Employing a luminosity selection inspired by binary population studies yields a mean M2 = 0.32 M with a 2σ upper limit of 0.60 M and a mean distance d = 1596 pc with a 2σ upper limit of 1980 pc. The secondary star is located in its Hertzsprung-Russell diagram at a mean T_eff, 2_ = 4120 K and log(L2/L) = - 0.92, from where the binary can evolve into either a polar or an ultracompact binary with a highly magnetic primary. The system displays a variable accretion rate, lapses repeatedly into short-lived low states of negligible accretion, and currently displays an orbital period that decreases on a timescale of τ ∼ 3 x 105 yr. X-ray observations, optical spectroscopy, and spectropolarimetry have a high potential for studies of the properties of J1832 as an individual object and of stream-fed accretion in general.

Abstract Copyright: © ESO 2022

Journal keyword(s): binaries: eclipsing - novae, cataclysmic variables - binaries: close - stars: individual: J1832.4-1627

Simbad objects: 21

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Number of rows : 21
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* XY Ari CV* 02 56 08.185 +19 26 34.12           ~ 151 1
2 V* HY Eri CV* 05 01 46.4033893080 -03 59 20.542022844           ~ 25 0
3 V* V1062 Tau CV* 05 02 27.4778229096 +24 45 23.157957240           ~ 70 0
4 V* UU Col CV* 05 12 13.2335083440 -32 41 39.743719692   17.72       ~ 44 0
5 V* BY Cam CV* 05 42 48.8013535344 +60 51 31.376128608   16.60       ~ 251 0
6 V* TX Col CV* 05 43 20.1155786784 -41 01 54.309912963   14.5       ~ 152 0
7 V* V405 Aur CV* 05 57 59.2934496792 +53 53 44.926489464           ~ 125 0
8 V* V902 Mon CV* 06 27 46.4047189728 +01 48 11.027200176           ~ 14 0
9 V* PQ Gem CV* 07 51 17.3280306912 +14 44 23.874868716           ~ 219 0
10 V* V597 Pup No* 08 16 17.9596509204 -34 15 24.933440401   21.65       ~ 48 0
11 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 681 0
12 NOVA Sco 1437 No* 16 53 -40.0           ~ 17 0
13 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 148 0
14 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 993 1
15 SWIFT J183221.5-162724 * 18 32 21.5629981591 -16 27 24.245005329           ~ 4 0
16 EQ J183224.1-162808.1 * 18 32 24.118 -16 28 08.13           ~ 1 0
17 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 328 0
18 V* V754 Lyr EB* 19 12 23.3059649088 +40 49 53.480757360           ~ 14 0
19 V* V1432 Aql CV* 19 40 11.4199326288 -10 25 25.771706256     14.40 15.437   ~ 163 0
20 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 777 0
21 V* CD Ind CV* 21 15 41.0450813472 -58 40 54.058462428           ~ 93 0

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2023.01.27-18:59:19

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