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TW Pictoris

A light curve for TW Pictoris. The main plot, adapted from Scaringi et al. (2021), shows the long-term visual band variation, and the inset plot, adapted from Patterson and Moulden (1993), shows the periodic variability.
Observation data Epoch J2000      Equinox J2000
Constellation	Pictor
Right ascension	05 34 50.586
Declination	−58° 01′ 40.77″
Apparent magnitude (V)	15.10 (14.1 - 15.6)
Characteristics
U−B color index	0.99
B−V color index	0.27
Variable type	Nova-like variable
Astrometry
Proper motion (μ)	RA: −11.632 mas/yr Dec.: 3.745 mas/yr
Parallax (π)	2.2839 ± 0.0223 mas
Distance	1,430 ± 10 ly (438 ± 4 pc)
Other designations
TW Pic, H0534-581
Database references
SIMBAD	data

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. One of the components is an accreting white dwarf.

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, but the lack of an X-ray pulsation makes this less likely. The current classification remains controversial.

References

1. ^ Scaringi, S.; et al. (October 2021). "An accreting white dwarf displaying fast transitional mode switching". Nature Astronomy. 6: 98–102. arXiv:2110.09124. Bibcode:2022NatAs...6...98S. doi:10.1038/s41550-021-01494-x. S2CID 239015940.
2. Patterson, Joseph; Moulden, Margaret (July 1993). "Rapid Oscillations in Cataclysmic Variables. X. TW Pictoris (= H0534-581)". Publications of the Astronomical Society of the Pacific. 105: 779–784. Bibcode:1993PASP..105..779P. doi:10.1086/133229. S2CID 122934884.
3. ^ 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.
4. ^ 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.
5. Watson, Christopher (4 January 2010). "TW Pictoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 July 2014.
6. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869. Retrieved 2021-11-27.
7. "TW Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-27.
8. 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.
9. 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.
10. 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.
11. 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.

v t e Constellation of Pictor
List of stars in Pictor Pictor in Chinese astronomy
Stars	Bayer α β γ δ ζ η η θ ι κ λ μ ν μ Dor Variable R S RR SW TU TV TW TX AB AE AK VZ HR 1498 1667 1727 1742 1813 1856 1860 1912 1984 2008 2023 2032 2044 2049 2072 2089 2094 2114 2117 2138 2274 2336 2337 2345 2354 2360 2369 2389 2562 HD 37781 40307 41004 41248 Other 2MASS J05581644–4501559 EBLM J0555-57 NGC 1995 PSR J0437−4715 TOI-270 TOI-1338 WISE 0647−6232
Exoplanets AB Pictoris b β Pictoris b c HD 40307 b c d e f g HR 2562 B LHS 1815 b TOI-1338 b c
Galaxies	NGC 1705 1803 1998 2008 Other Pictor A PKS 0529-549 PKS 0537-441 QSO J0529-4351
Category

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