2001A&A...378..837L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST19:37:05

2001A&A...378..837L - Astronomy and Astrophysics, volume 378, 837-842 (2001/11-2)

X-ray and optical periodicities in X-ray binaries. I. A0535+26.

LARIONOV V., LYUTY V.M. and ZAITSEVA G.V.

Abstract (from CDS):

A homogeneous set of UBV photometry (354 data points obtained between 1983 and 1998) for the Be/X-ray binary A0535+26=V725 Tau is analysed, aiming to look for possible periodic component(s). After subtraction of the long-term variation it was found that only a≃103d periodic component remains in the power spectra in both the V and B colour bands. The probability of chance occurrence of such a peak is less than 0.1%. There are no signs of optical variability at the X-ray period (≃111d). We discuss possible reasons for a 103-day modulation and suggest that it corresponds to a beat frequency of the orbital period of the neutron star and the precession period (≃1400d) either of an accretion disc around the neutron star or a warped decretion disc around the Be star.

Abstract Copyright:

Journal keyword(s): stars: binaries: general - stars: circumstellar matter - stars: individual: V725 Tau - stars: pulsars: individual: A0535+26 - stars: variables: general - accretion, accretion discs

CDS comments: HDE 245570 misprint for HDE 245770

Simbad objects: 5

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Number of rows : 5

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 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 663 0
2 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 906 0
3 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 609 0
4 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 871 0
5 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 996 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-19:37:05

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