| 词条 | TV Pictoris |
| 释义 |
| name=TV Pictoris}}{{Starbox observe | epoch=J2000 | ra={{RA|04|48|57.47286}}[1] | dec={{DEC|-47|08|04.2557}}[1] | appmag_v=7.37 - 7.53[2] | constell=Pictor }}{{Starbox character | class=A2V[2] | b-v= | u-b= | variable=Ellipsoidal[3] }}{{Starbox catalog | names={{odlist|HD=30861HIP=22370|SAO=217011|CD=-47 1526|V=TV Pic}} }}{{Starbox reference | Simbad = TV+Pic }}{{Starbox end}}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.[2] It was first discovered to be variable in 1987.[4] 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.[5] 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,[6] this system is {{Convert|195|pc|ly|abbr=off|lk=on|disp=flip}} from Earth. Analysing and recalibrating yields a parallax of 4.70 and hence a distance of {{Convert|213|pc|ly|abbr=off|lk=on|disp=flip}}.[7] References1. ^1 {{cite simbad|title=V* TV Pic|accessdate=25 May 2014}} {{Stars of Pictor}}2. ^1 2 {{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=26362 |title=TV Pictoris |author =Otero, Sebastian Alberto |date=21 November 2012 |work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=25 May 2014}} 3. ^{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 4. ^{{cite journal | title=HD 30861, a New Ellipsoidal Variable |author=Verschuren, W. |author2=Hensberge, H. |author3=Schneider, H. |author4=Pavlovski, K.|journal=Information Bulletin on Variable Stars| volume=3120|date=1987|bibcode=1987IBVS.3120....1V}} 5. ^{{cite journal| last = Pavlovski| first = K.| display-authors=4| last2=Cuypers| first2= J.| last3=David| first3=M.| last4=Griffin| first4= R. E. M.| last5=Hensberge| first5= H.| last6=Ilijic| first6= S.| last7=Schneider| first7=H.| last8=Verschueren| first8=W.| title = The nearby ellipsoidal variable TV Pictoris| journal = Astronomy and Astrophysics| volume =331| pages = 639–50| date=1998| bibcode = 1998A&A...331..639P}} 6. ^{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}Vizier catalog entry 7. ^{{cite journal| title = New absolute magnitude calibrations for W Ursa Majoris type binaries |author = Eker, Z. |display-authors = 4 |author2 = Bilir, S. |author3 = Yaz, E. |author4 = Demircan, O. |author5 = Helvaci, M. |journal=Astronomische Nachrichten |volume=330 |issue = 1|pages= 68–77 |date=2009|doi=10.1002/asna.200811041 |bibcode=2009AN....330...68E|arxiv = 0807.4989 }} 7 : Objects with variable star designations|Pictor (constellation)|A-type main-sequence stars|Rotating ellipsoidal variables|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects |
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