Astronomy:TV Pictoris
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | |
| 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]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 "V* TV Pic". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+TV+Pic.
- ↑ 3.0 3.1 3.2 Otero, Sebastian Alberto (21 November 2012). "TV Pictoris". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=26362. Retrieved 25 May 2014.
- ↑ Samus, N. N. 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.
- ↑ 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.
- ↑ 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.
- ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html.Vizier catalog entry
- ↑ 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. doi:10.1002/asna.200811041. Bibcode: 2009AN....330...68E.
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