TV Pictoris

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TV Pictoris
TVPicLightCurve.png
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
SIMBAD data

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]

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]

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References

  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 "V* TV Pic". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 25 May 2014.
  3. 1 2 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.