TV Pictoris

TV Pictoris is a rotating ellipsoidal variable star in the constellation Pictor. It ranges between apparent magnitude 7.37 - 7.53 over a period of 0.85 days.[3] It was first discovered to be variable in 1987.[5] The system is inclined at an angle of 54 degrees to observers on Earth. It is composed of a primary star that has a radius 4.3 times that of the sun and 1.2 times its mass, and an effective (surface) temperature of 8300 K, and a secondary star with a radius 2.1 times that of the sun and 40% of its mass, and an effective temperature of 7000 K. Both stars are less massive than expected for a main sequence star of their temperatures. The secondary rotates much faster than the primary.[6]

TV Pictoris

A light curve for TV Pictoris, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 04h 48m 57.47286s[2]
Declination −47° 08′ 04.2557″[2]
Apparent magnitude (V) 7.37 - 7.53[3]
Characteristics
TV Pictoris A
Spectral type A2V[3]
Variable type Ellipsoidal[4]
TV Pictoris B
Spectral type A9-F0V
Other designations
TV Pic, CD−47 1526, HD 30861HIP=22370, SAO 217011
Database references
SIMBADdata

The system shines with a combined spectrum of A2V. Based upon an annual parallax shift of 5.14 milliarc seconds as measured by the Hipparcos satellite,[7] this system is 640 light-years (195 parsecs) from Earth. Analysing and recalibrating yields a parallax of 4.70 and hence a distance of 690 light-years (213 parsecs).[8]

References
  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. "V* TV Pic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 May 2014.
  3. Otero, Sebastian Alberto (21 November 2012). "TV Pictoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. Verschuren, W.; Hensberge, H.; Schneider, H.; Pavlovski, K. (1987). "HD 30861, a New Ellipsoidal Variable". Information Bulletin on Variable Stars. 3120: 1. Bibcode:1987IBVS.3120....1V.
  6. Pavlovski, K.; Cuypers, J.; David, M.; Griffin, R. E. M.; et al. (1998). "The nearby ellipsoidal variable TV Pictoris". Astronomy and Astrophysics. 331: 639–50. Bibcode:1998A&A...331..639P.
  7. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.Vizier catalog entry
  8. Eker, Z.; Bilir, S.; Yaz, E.; Demircan, O.; et al. (2009). "New absolute magnitude calibrations for W Ursa Majoris type binaries". Astronomische Nachrichten. 330 (1): 68–77. arXiv:0807.4989. Bibcode:2009AN....330...68E. doi:10.1002/asna.200811041. S2CID 15071352.
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