2001A&A...367..266R


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST05:15:21

2001A&A...367..266R - Astronomy and Astrophysics, volume 367, 266-272 (2001/2-3)

The Be/X-ray binary LS 992/RX J0812.4-3114: Physical parameters and long-term variability.

REIG P., NEGUERUELA I., BUCKLEY D.A.H., COE M.J., FABREGAT J. and HAIGH N.J.

Abstract (from CDS):

We present the first long-term optical and infrared study of the optical counterpart to the source RX J0812.4-3114, an X-ray pulsar with a Be type companion. During the period covered by the observations the profile of some Balmer lines changed from absorption to emission and back again to absorption. Contemporaneously, the infrared magnitudes varied by more than 0.8 mag. This long-term variability is interpreted as the formation and subsequent dissipation of the Be star's disc. The building up of the disc ended up in an active X-ray state characterised by regular outbursts occurring at 80 day intervals. The overall duration of the formation/dissipation of the disc is found to be ≲4.3 years. Optical spectroscopic and infrared photometric observations were used to refine the spectral type of the primary (B0.2IV) and to monitor the circumstellar envelope around the Be star. UBVRI and uvbyβ photometric observations allowed the determination of the astrophysical parameters of the optical companion.

Abstract Copyright:

Journal keyword(s): stars: individual: LS 992/RX J0812.4-3114 - binaries: general - stars: pulsars: general - stars: emission-line, Be - X-rays: stars

Simbad objects: 7

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Number of rows : 7

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 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 573 0
3 * nu. Ori SB* 06 07 34.3258759 +14 46 06.506096 3.6 4.240 4.397     B3V 219 0
4 HD 48434 * 06 43 38.6453955404 +03 55 57.114117401 4.99 5.88 5.90     B0II 145 0
5 V* V572 Pup HXB 08 12 28.3576629560 -31 14 52.138780764 12.14 13.03 12.74 12.44   B0.2IVe 60 0
6 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 855 0
7 V* V2246 Cyg HXB 20 32 15.2744631713 +37 38 14.839930326   22.16 19.41 17.32 15.18 B0Ve 377 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-05:15:21

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