TW Pictoris

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TW Pictoris
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 05h 34m 50.586s[1]
Declination −58° 01′ 40.77″[1]
Apparent magnitude (V) 15.10[2] (14.1 - 15.6)[3]
Characteristics
U−B color index 0.99[2]
B−V color index 0.27[2]
Variable type Nova-like variable[4]
Astrometry
Proper motion (μ) RA: −11.632[1] mas/yr
Dec.: 3.745[1] mas/yr
Parallax (π)2.2839 ± 0.0223[1] mas
Distance1,430 ± 10 ly
(438 ± 4 pc)
Other designations
TW Pic, H0534-581[5]
Database references
SIMBADdata

TW Pictoris is a 14th magnitude cataclysmic variable star system in the southern constellation of Pictor. It is located at a distance of approximately 1,430 light-years based on parallax measurements. Photometric observations in the visual band suggest a binary system with an orbital period of 6.06 hours.[6] One of the components is an accreting white dwarf.[7]

The X-ray source H0534-581 was identified from the data collected by the HEAO 1 satellite in 1979. In 1984, a candidate optical counterpart was identified by I. R. Tuohy and associates from photographs taken at the Schmidt telescope. A low-resolution spectrum revealed this is a cataclysmic variable, and it was assigned the variable star designation TW Pictoris. It was initially proposed to be an intermediate polar,[8][9] but the lack of an X-ray pulsation makes this less likely.[10] The current classification remains controversial.[7]

References[]

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c O'Donoghue, D.; et al. (May 2013). "The Edinburgh-Cape Blue Object Survey - III. Zone 2; galactic latitudes -30° > b > -40°". Monthly Notices of the Royal Astronomical Society. 431 (1): 240–251. Bibcode:2013MNRAS.431..240O. doi:10.1093/mnras/stt158.
  3. ^ Watson, Christopher (4 January 2010). "TW Pictoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 July 2014.
  4. ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. Retrieved 2021-11-27.
  5. ^ "TW Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-27.
  6. ^ Balman, S.; et al. (June 2016). XMM-Newton Observations of TW PIC in comparison with the Archival SWIFT and RXTE data. XMM-Newton: The Next Decade, Proceedings of the Conference held 9-11 May, 2016 at ESAC, Madrid. Bibcode:2016xnnd.confE..73B. 73.
  7. ^ a b Scaringi, S.; et al. (October 2021). "An accreting white dwarf displaying fast transitional mode switching". Nature Astronomy, Advanced Online Publication. arXiv:2110.09124. Bibcode:2021NatAs.tmp..201S. doi:10.1038/s41550-021-01494-x.
  8. ^ Tuohy, I. R.; et al. (December 1986). "Identification of two southern X-ray emitting cataclysmic variables". Astrophysical Journal. 311: 275–298. Bibcode:1986ApJ...311..275T. doi:10.1086/164770.
  9. ^ Mouchet, M.; et al. (October 1991). "The UV variability of the intermediate polars TW Pictoris (H 0534-581) and TX Columbae (1H 0542-407)". Astronomy and Astrophysics. 250: 99. Bibcode:1991A&A...250...99M.
  10. ^ Norton, A. J.; et al. (February 2000). "The nature of TW Pictoris". Monthly Notices of the Royal Astronomical Society. 312 (2): 362–370. Bibcode:2000MNRAS.312..362N. doi:10.1046/j.1365-8711.2000.03216.x.


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