6533b858fe1ef96bd12b641a
RESEARCH PRODUCT
The Be/X-ray binary LS 992/RX J0812.4-3114: Physical parameters and long-term variability
Juan FabregatM. J. CoeN. J. HaighIgnacio NegueruelaDavid A. H. BuckleyPablo ReigPablo Reigsubject
InfraredBe starAstrophysics::High Energy Astrophysical PhenomenaX-ray binaryFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICALS 992/RX J0812.4-3114Astrophysicssymbols.namesakePulsarX-raysAstrophysics::Solar and Stellar AstrophysicsAbsorption (electromagnetic radiation)Astrophysics::Galaxy AstrophysicsPhysicsAstrophysics (astro-ph)BinariesIndividual star ; LS 992/RX J0812.4-3114 ; Binaries ; Pulsars Emission-line ; Be ; X-raysBalmer seriesAstronomy and AstrophysicsBeCircumstellar envelopeDissipation:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Space and Planetary SciencesymbolsIndividual starPulsars Emission-lineAstrophysics::Earth and Planetary AstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]description
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 uvby\beta photometric observations allowed the determination of the astrophysical parameters of the optical companion.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-11-15 |