2014MNRAS.437.2948O


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST14:52:17

2014MNRAS.437.2948O - Mon. Not. R. Astron. Soc., 437, 2948-2956 (2014/January-3)

Optical and X-ray properties of CAL 83 - II. An X-ray pulsation at ∼ 67s.

ODENDAAL A., MEINTJES P.J., CHARLES P.A. and RAJOELIMANANA A.F.

Abstract (from CDS):

CAL 83 is the prototypical close binary supersoft X-ray source in the Large Magellanic Cloud, has a 1 d orbital period, and is believed to consist of a white dwarf (WD) primary accreting from an evolved donor. Based on published WD model atmosphere fits to X-ray data, the WD has a mass of ∼ 1.3M, just below the Chandrasekhar limit. From a systematic search through archival XMM-Newton data for periodic emission from CAL 83 down to the shortest possible period just above the WD break-up period, we report the discovery of an ∼ 67s supersoft X-ray modulation, which we interpret as the rotation period of a highly spun-up WD. Such a short period can be explained within the framework of a high mass accretion history, where accretion disc torques could have spun up the WD over time-scales comparable to the thermal time-scale. The presence of carbon, oxygen and nitrogen in published optical and ultraviolet spectra may suggest CNO cycling in the envelope of a secondary star that is oversized for its inferred mass, suggesting that the secondary star shed a significant fraction of its envelope during a high mass-transfer history, resulting in a highly spun-up WD. The reported 67s period shows an approximately ±3s drift from the median value in single runs, which we interpret as a hydrogen burning gas envelope surrounding the WD, with a period not quite synchronized with the WD rotation period.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: CAL 83 - stars: oscillations - white dwarfs - X-rays: stars

Status at CDS:  

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10778 1
2 NAME M31PSS CV* 00 43 19.59 +41 17 56.9           ~ 22 0
3 2XMMi J004319.9+411346 No* 00 43 20.00 +41 13 46.0       17.0   ~ 28 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5550 1
5 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 304 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14630 1
7 UCAC2 2073373 HXB 05 41 34.3044817531 -68 25 48.449467067   14.03 14.01 14.12 13.83 B0-B1IIIe 24 1
8 2E 1550 XB* 05 43 34.1600994175 -68 22 22.189299745   15.9   17.2 16.54 ~ 305 0
9 V* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 918 0
10 V* DQ Her No* 18 07 30.2510755201 +45 51 32.564649735   12.99 15.16 11.46   M3+Ve 954 1
11 V* V533 Her No* 18 14 20.4845602013 +41 51 22.070248280           ~ 231 0
12 V* AE Aqr DQ* 20 40 09.1598509019 -00 52 15.057042857   12.46 10.40   10.191 K3-5IV/V 602 0

    Equat.    Gal    SGal    Ecl

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2020.04.06-14:52:17

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